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Collaborating Authors
Results
Evaporite-Distribution Typing From Resistivity Images and Openhole Logs in a Middle Eastern Reservoir
Hruška, Marina (Chevron Energy Technology Company) | Bachtel, Steve (Chevron Energy Technology Company) | Archuleta, Bonny (Chevron Energy Technology Company) | Skalinski, Mark (Chevron Energy Technology Company)
Summary In this integrated study using resistivity images, conventional openhole logs, and core data from a Middle Eastern reservoir, abundance and geometric configuration of bedded and nodular evaporite have been studied to help distinguish which nodular forms of evaporite may be related to a permeability suppression. Several logs have been calculated from the resistivity image log to quantify nodular evaporite and help predict the presence of corresponding core facies well. Compared with thin-section description, most samples of nodular evaporite were exhibiting fine-scale cementation as well, and their permeability was suppressed compared with samples with rare or no fine-scale cementation in thin sections.
- Europe (0.93)
- Asia > Middle East (0.69)
- North America > United States > New Mexico (0.46)
- (2 more...)
- Geology > Rock Type > Sedimentary Rock > Evaporite (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (0.98)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying (0.46)
- North America > United States > Texas > Permian Basin > Central Basin > Word Group > San Andres Formation (0.99)
- North America > United States > New Mexico > Permian Basin > Delaware Basin > Upper Pennsylvanian > Vacuum Field > San Andreas Formation > San Andreas Formation > Upper San Andreas Formation (0.99)
- North America > United States > New Mexico > Permian Basin > Delaware Basin > Upper Pennsylvanian > Vacuum Field > San Andreas Formation > Lower San Andreas Formation > Upper San Andreas Formation (0.99)
- (10 more...)
Abstract The Middle Minagish Oolite Formation is 450 to 550 feet thick interval of porous limestone reservoir, composed of peloidal/skeletal grainstones with lesser amount of packstone, oolitic grainstone, wackstone and mudstone in Umm Gudair field, West Kuwait. It is characterized by small scale reservoir heterogeneity, primarily related to the depositional as well as diagenetic features. Capturing reservoir properties in micro scale and its spatial variation needs special attention in this reservoir due to its inherent anisotropy. Reservoir properties will depend on the level that we are analyzing on reservoir (millimeter to meter scale). Here we used Electrical Borehole Image (EBI) and Nuclear Magnetic Resonance (NMR) to capture small scale feature of Umm Gudair carbonate reservoir and compared them with core data In present work, reservoir properties (including texture, facies, porosity and permeability) interpreted by the EBI shows good match with NMR driven properties and core data. Textural changes in image logs also match well with pore size distribution from NMR logs. Further highly porous zones which are considered either due to primary porosity or vugs match with larger pores of NMR logs and these corroborates with also core derived porosity. A good match has been observed between EBI, NMR and cored derived porosity. Permeability calculations have also been made and compared with core data. A detail workflow has been developed here to interpret reservoir properties on un-cored wells, where only low vertical resolution data is available. This technique is quite useful to identify the characters and mode of origin highly porous zones in reservoir section which are generally not identifiable by low resolution standard logs. This workflow will allow us to interpret the heterogeneity at high resolution level in un-cored wells, as results are validated with integration of EBI, NMR and core data.
- North America > United States > Texas (1.00)
- Asia > Middle East > Kuwait (0.88)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.34)
- Geophysics > Seismic Surveying > Borehole Seismic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (40 more...)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (1.00)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring > Borehole imaging and wellbore seismic (1.00)
Structure and Hydrocarbon Prospects of the Russian Western Arctic Shelf
Stoupakova, A.V. (Moscow State University) | Kirykhina, T.A. (Moscow State University) | Suslova, A.A. (Moscow State University) | Kirykhina, N.M. (Moscow State University) | Sautkin, R.S. (Moscow State University) | Bordunov, S.I. (Moscow State University)
Abstract The Russian Western Arctic Basins cover the huge area including the Barentsand Kara seas, the western part of the Laptev sea and adjacent territories withsome archipelagoes and islands (Spitsbergen, Franz Josef Land, SevernayaZemlya, Novaya Zemlya, etc.). They comprise the Barents and Kara Basins, thenorthern areas of the Timan-Pechora Basin, the North West Siberia, includingYamal and Gidan peninsulas and the Yenisey-Khatanga Basin. Within the RussianWestern Arctic basins the following main tectonic elements can be identified:extensional depressions (Central-Barents, Yenisei-Khatanga, West Siberia, EastUrals) with sedimentary thickness is more than 12–14 km; platform massiveswith average thickness of sediments of 4 – 6 km, monoclines and tectonic steps, like transition zones between extensional depressions and platform massives. Western Arctic basins are filled by mainly Palaeozoic and Mesozoic sedimentarysuccessions. In the sedimentary cover of this large region, many commonstratigraphic complexes and unconformities can be traced within Palaeozoic andMesozoic complexes that show similarity of geological conditions of theirformation. Analysis of the Russian Western Arctic basins, their structures andhydrocarbon prosepctivity shows the areas, which are favourable for hydrocarbonaccumulations. Deep depressions, as areas of long-term and stable sinking, arehighly promising zones for the accumulation of predominantly gas fields. Theyform regional gas accumulation belts, extending for thousands of kilometres, where the largest fields can be expected in the zones of their intersectionwith the major tectonic elements of another strike. Within the Barents-Karashelf, the large belt of predominantly gas accumulation extends from the northof the West Siberian province through the South Kara basin and into the BarentsSea. The second potential belt of predominantly gas accumulation may beassociated with the North Barents ultra-deep depression. On the flanks of thedepressions the sedimentary cover profile does not contain the complete set ofoil-and-gas-bearing complexes, identified in the central parts of theextensional depressions. The reservoirs can be filled by HC due to the lateralmigration of fluids from the neighbouring kitchens or from their own dominantoil-and-gas source rock strata. For the formation of oil accumulations, themost favourable are platform massifs and ancient uplifts areas.
- North America (1.00)
- Europe > Russia > Barents Sea (1.00)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug (1.00)
- (3 more...)
- Phanerozoic > Mesozoic > Jurassic (1.00)
- Phanerozoic > Mesozoic > Triassic (0.70)
- Phanerozoic > Paleozoic > Devonian > Upper Devonian (0.69)
- (2 more...)
- Geology > Sedimentary Basin (1.00)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (1.00)
- (3 more...)
- Europe > Russia > Northwestern Federal District > Northwestern Federal District > Nenets Autonomous Okrug > Timan-Pechora Basin (0.99)
- Europe > Russia > Northwestern Federal District > Nenets Autonomous Okrug > Timan-Pechora Basin > Khoreiver Basin > Pomorskoye Field (0.99)
- Europe > Russia > Northwestern Federal District > Komi Republic > Nenets Autonomous Okrug > Timan-Pechora Basin (0.99)
- (46 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management (1.00)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring (0.94)
Tight Gas Exploration Potential of Middle Triassic to Early Jurassic Successions in Abu Dhabi
Taher, Ahmed ((Abu Dhabi National Oil Company)) | Al Shateri, Abdulla ((Abu Dhabi National Oil Company)) | Al Mehsin, Khalil ((Abu Dhabi National Oil Company)) | Witte, Johan ((Abu Dhabi National Oil Company)) | Al Zaabi, Mohamed ((Abu Dhabi National Oil Company)) | Obaid, Khalid ((Abu Dhabi National Oil Company))
Abstract Middle Triassic to Early Jurassic formations were not previously considered as exploration objectives. Only a limited wells penetrate these formations and most of these wells were targeting the deeper Khuff and pre-Khuff reservoirs. Stratigraphically, the section is comprised of sequences of shallow marine mixed carbonates intercalating with shale, sandstone and anhydrite streaks. These formations, although they exhibit gradual thickening from the north towards the south direction, yet they show remarkable lateral consistency, both in lithology and log response. Primary and secondary porosity are generally poor in these formations, reflecting the deep burial depth and the intercalation of shale and anhydrite beds with the carbonate reservoirs. Structurally, the formations have been subjected to numerous phases of tectonic deformation that have affected the facies variations and reservoir development. Evidence indicates that the early phase of Qatar Arch development and the southeast Mender palaeohigh were tectonically active during the Triassic time. The Lower Jurassic and Upper Triassic formations have discontinuous and moderate source rock development. Sapropelic kerogen constitutes the dominant type of organic matter, however, also humic type is present but in minor quantities (Lutfi, 1987; Hassan, 1989). The top Triassic maturation modeling showed various degrees of thermal maturation ranging from mature to intensively mature stages. Interpretation of the maturation regime indicated that most of onshore Abu Dhabi is in the dry gas generation window. The southern offshore area is within the wet gas generation, while the northern offshore is still in the oil generation window. The relatively lean source rock intervals found within the Lower Jurassic and Triassic Formations suggest that there is a significant charge contribution from the deeper Silurian Hot Shale source rocks. Pronounced gas shows were experienced while drilling some of the offshore and onshore structures. The well data indicates that the Izhara, Hamlah, Minjur and Marrat Formations are developed in onshore Abu Dhabi. Sedimentary patterns, facies variations and log response of the Lower Izhara, Minjur and possibly Upper Gulailah Formations suggest the presence of shale gas developed in these formations.
- Phanerozoic > Mesozoic > Jurassic > Lower Jurassic (1.00)
- Phanerozoic > Mesozoic > Triassic > Upper Triassic (0.69)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (1.00)
- Geology > Geological Subdiscipline (1.00)
- Asia > Middle East > UAE > Rub' al Khali Basin (0.99)
- Asia > Middle East > UAE > Abu Dhabi > Arabian Gulf > Rub' al Khali Basin > Abu Dhabi Field (0.97)
- Asia > Middle East > Kuwait > Jahra Governorate > Arabian Basin > Widyan Basin > North Kuwait Jurassic (NKJ) Fields > Marrat Formation > Upper Marrat Formation (0.96)
- (26 more...)
A 3-Year Results of Application a Combined Scale Inhibition and Hydraulic Fracturing Treatments using a Novel Hydraulic Fracturing Fluid, Russia
Levanyuk, Olesya (Schlumberger) | Overin, Alexander (Schlumberger) | Sadykov, Almaz (Schlumberger) | Parkhonyuk, Sergey (Schlumberger) | Lungwitz, Bernhard (Schlumberger) | Enkababian, Philippe (Schlumberger) | Klimov, Alexander (Imperial Energy) | Energy, Imperial (Imperial Energy) | Legeza, Sergey (Imperial Energy)
Abstract Scale deposits are a common problem in oil and gas wells and can have detrimental effects on well production. Depending on the severity, scaling can stop production entirely as scale forms anywhere in the well production system, including the formation, perforations, casing or tubular, and in or on the artificial lift equipment. There are several chemical and mechanical methods for removing scale deposits. However, to prevent scale deposition, the only solution is chemical inhibitors injected into the formation. The typical production system includes artificially lifted, stimulated wells (propped hydraulic fractures) placed in reservoirs where pressure maintenance is achieved by water flooding. The artificial lifting is typically accomplished through use of electric submersible pumps (ESPs). In reservoirs where produced fluids exhibit scaling tendencies, ESP run life is significantly shortened by scale formation on the pump elements restricting rotation. By treating the formation with chemical inhibitors, the life of the ESP can be extended. In this paper we provide approaches for improving a compatibility of a novel hydraulic fracturing fluid (used in Russia) and scale inhibitor. A 3-year campaign to combine scale inhibition with the hydraulic propped fracture effectively increased the average run life of ESPs in the Mayskoe and Snezhnoe oil fields.
- Asia > Russia (1.00)
- North America > United States > Texas (0.68)
- Europe > Russia > Siberian Federal District > Tomsk Oblast (0.33)
- Energy > Oil & Gas > Upstream (1.00)
- Water & Waste Management > Water Management > Constituents > Salts/Sulphates/Scales (0.97)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (30 more...)
Abstract Streamline and streamtube methods have been used in fluid flow computations for many years. Early applications for hydrocarbon reservoir simulation were first reported by Fay and Pratts in the 1950s. Streamline-based flow simulation has made significant advances in the last 15 years. Today's simulators are fully three-dimensional and fully compressible and they account for gravity as well as complex well controls. Most recent advances also allow for compositional and thermal displacements. In this paper, we present a comprehensive review of the evolution and advancement of streamline simulation technology. This paper offers a general overview of most of the material available in the literature on the subject. This work includes the review of more than 200 technical papers and gives a chronological advancement of streamline simulation technology from 1996 to 2011. Firstly, three major areas are identified. These are development of streamline simulators, enhancements to current streamline simulators and applications. In view of the fact that this state of-the-art technology has been employed for a wide range of applications, we defined three major application areas that symbolize the relevance and validity of streamline simulation in addressing reservoir engineering concerns. These are history matching, reservoir management and upscaling, ranking and characterization of fine-grid geological models. Streamline simulation has undergone several phases within its short stretch in the petroleum industry. Initially, the main focus was on the speed advantage and less on fluid flow physics. Next, the focus was shifted to extend its applicability to more complex issues such as compositional and thermal simulations, which require the inclusion of more physics, and potentially reducing the advantage of computational time. Recently, the focus has shifted towards the application of streamline technologies to areas where it can complement finite difference simulation such as revealing important information about drainage areas, flood optimization and improvement of sweep efficiency, quantifying uncertainties, etc.
- South America (1.00)
- Europe (1.00)
- Africa (0.92)
- (6 more...)
- Geology > Sedimentary Geology > Depositional Environment (0.93)
- Geology > Rock Type > Sedimentary Rock (0.67)
- Geology > Geological Subdiscipline > Economic Geology > Petroleum Geology (0.34)
- Geophysics > Time-Lapse Surveying > Time-Lapse Seismic Surveying (1.00)
- Geophysics > Seismic Surveying (1.00)
- South America > Venezuela > Trujillo > Maracaibo Basin > Ayacucho Blocks > Ceuta-Tomoporo Field (0.99)
- South America > Argentina > Mendoza > Cuyo Basin > La Ventana Field (0.99)
- South America > Argentina > Cuyo Basin (0.99)
- (26 more...)
ABSTRACT Our objective is to unlock the wealth of information contained in drill cuttings in real-time for complementing petrophysical characterization while drilling. The approach is to integrate the direct measurement from drill cuttings with Logging While Drilling (LWD) data to sup-port drilling, geosteering and formation evaluation. Our objective is to unlock the wealth of information contained in drill cuttings in real-time for complementing petrophysical characterization while drilling. The approach is to integrate the direct measurement from drill cuttings with Logging While Drilling (LWD) data to sup-port drilling, geosteering and formation evaluation. A way to tackle the above challenge is to perform a geochemical elemental analysis, by means of Energy-Dispersive X-Ray Fluorescence (ED-XRF). A reliable, portable ED-XRF instrument, robust enough for rig site employment is routinely used for a wellsite chemostratigraphy service. The instrument produces accurate elemental data, which can, in addition to its chemostratigraphic applications, be used for mineral and lithology modeling. A methodology has been developed to convert the elemental analysis into a mineralogical composition of the rock sample that is comparable to measurements from full scale X-Ray Diffraction (XRD) laboratory equipment. An experimental setup was deployed to assess the ability of modeling mineralogy from geochemical analysis (wellsite ED-XRF) of a set of rock samples in a blind test (Marsala et al., 2011). The analytical results were compared to results obtained from the same samples through state-of-the-art laboratory ED-XRF and wave-length dispersive XRF (WD-XRF) instruments. The geochemical data from the wellsite and the two lab-based instruments show good agreement. Finally, the modeled mineral compositions from whole-rock geochemical data were compared with the mineralogy determined from XRD analysis and showed good agreement. Modeled mineralogy from whole-rock geochemical data has been utilized in a wide range of applications rang-ing from mineralogy and lithology, to "brittleness index" determination for frac design in shale gas reservoirs.
- Europe (1.00)
- North America > United States (0.94)
- Asia > Middle East > Saudi Arabia (0.71)
- Africa (0.69)
- Geology > Geological Subdiscipline > Mineralogy (1.00)
- Geology > Geological Subdiscipline > Geochemistry (1.00)
- Geology > Geological Subdiscipline > Stratigraphy > Chemostratigraphy (0.93)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.50)
- Well Drilling > Drilling Measurement, Data Acquisition and Automation > Logging while drilling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- (2 more...)
Abstract The Netherlands is a mature hydrocarbon province. EBN, the Dutch state participant for hydrocarbon exploitation and exploration, has identified shale plays as one of the contributors to add reserves and to maintain production at the current level. The main source rock for the limited amount of oil accumulations in The Netherlands are the Lower Jurassic (Toarcian) oil-prone shales. Lower Carboniferous (Namurian) hot shales have often been suggested as possible contributor to oil and gas Formation in The Netherlands as well, but this has not been proven to date. Recent discoveries of gas in the time-equivalent Bowland shales in the UK have encouraged interest in the production potential of these shales in North-western Europe. In this paper the geological and geomechanical properties of the Lower Jurassic and Lower Carboniferous are presented in a shale play context. The assessment methodology is subdivided in three sections: 1) the overall geology of the play, 2) the type and quantification of hydrocarbons present and 3) the production characteristics. New and specific measurements on core and cutting material include pyrolysis, methane adsorption, mineralogy, texture, porosity, permeability, static and dynamic geomechanical properties, hardness and fracture conductivity. The two identified plays show very distinctive properties. The Lower Jurassic samples indicate to be mostly thermally immature for dry gas implying that liquids can be expected. The Lower Carboniferous samples show areas that are overcooked. Mineralogical and geomechanical data suggest that different stimulation strategies may be necessary for these two plays to produce hydrocarbons effectively. The source rocks of Lower Jurassic age qualify as relatively soft while the Lower Carboniferous shales with high TOC content classify as very hard. Comparing the results of the assessment to known shale plays in the US, the plays position themselves in the opposite extremes of the productive shale play spectrum.
- Europe > Netherlands (1.00)
- North America > United States > Texas (0.68)
- Phanerozoic > Paleozoic > Carboniferous > Mississippian (1.00)
- Phanerozoic > Mesozoic > Jurassic > Lower Jurassic (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (1.00)
- Geology > Petroleum Play Type > Unconventional Play > Shale Play (1.00)
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- (2 more...)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (31 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Shale oil (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Shale gas (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Management > Energy Economics > Unconventional resource economics (1.00)
Abstract The purpose of this study is to develop a horizontal well closed-looped optimization model for enhancing ultimate recovery of strong bottom water reservoir in Sudan. An optimization model for horizontal well using the statistical properties of geology and development data, numerical simulation and fuzzy mathematics, is presented. The study was carried out as follows: 1) a mechanism model was established based on physical and fluid properties of the oilfields in Block 1/2/4, Sudan. The factors affecting the development performance of horizontal well, such as reservoir and fluid properties, inter-beds distribution, parameters of horizontal segment and production rate were discussed. 2) Development performance of typical massive bottom water reservoir in Sudan was analyzed. 3) The weight of each factor was determined using fuzzy mathematics method based on the mechanism study and on site practice of horizontal wells. 4) Determine the optimized location and production parameters of horizontal well by combining numerical simulation and integrated evaluation model. The optimization model was used in H oilfield of Block 1/2/4, Sudan, the result of numerical simulation show that this model can efficiently determine the location of horizontal well and can lead to increase oil production in bottom water reservoir. It can also give a reference for numerical simulation, and have a great improve place.
- Africa > Sudan (1.00)
- Asia > China (0.94)
- North America > United States > Texas (0.28)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (34 more...)