Layer | Fill | Outline |
---|
Map layers
Theme | Visible | Selectable | Appearance | Zoom Range (now: 0) |
---|
Fill | Stroke |
---|---|
Collaborating Authors
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 171856, “Net-Pay Optimization and Improved Reservoir Mapping From Ultradeep Look-Around Logging-While-Drilling Measurements,” by Frank Antonsen, Per Atle Olsen, Stein Ottar Stalheim, Monica Vik Constable, Matthieu Irondelle, Michael Cook, and Trond Rognebakke Bjørstad, Statoil, and Christophe Dupuis, Philippe Marza, Jean Seydoux, Dzevat Omeragic, and Jean-Michel Denichou, Schlumberger, prepared for the 2014 Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, 10–13 November. The paper has not been peer reviewed. This paper discusses ultradeep directional-resistivity (DDR) logging-while-drilling (LWD) measurements for high-angle and horizontal wells that have been applied recently with success on the Norwegian continental shelf (NCS). The main benefits from the DDR measurements in the license have been to maximize reservoir exposure by active geosteering, optimize well placement above the oil/ water contact (OWC), and increase subsurface understanding. Background More than 50% of all production wells today on the NCS are highly deviated or horizontal. An operator has tested DDR measurements since 2009. This new while-drilling technology, with its increased depth of investigation and ability to interpret multiple boundaries above and below the wellbore, is regarded as a key technology in reaching the ambitious target recovery rate of 70%. Fig. 1 presents the bottomhole-assembly (BHA) architecture for the first DDR LWD tool with depth of investigation in excess of 30 m away from the borehole. The tool architecture consists of a set of subs spaced out on a BHA providing multispacing, multifrequency azimuthal measurements. With these measurements, a multilayer inversion generates a mapping of the resistivity distribution above and below the borehole. Differentiating this technology from standard image logs, the relative dip of the formation layer can be determined not only at the trajectory, but also away from the trajectory. In addition to the 1D (layer-cake) resistivity mapping, the tool provides an orientation of the map perpendicular to the formation-structure planes.
- Asia > Middle East > UAE > Abu Dhabi Emirate > Abu Dhabi (0.45)
- North America > United States (0.29)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.51)
- Geology > Sedimentary Geology > Depositional Environment (0.47)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 50 > Block 34/10 > Gullfaks Sør Field > Statfjord Group (0.98)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 50 > Block 34/10 > Gullfaks Sør Field > Lunde Formation (0.98)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 50 > Block 34/10 > Gullfaks Sør Field > Lista Formation (0.98)
- (13 more...)
Summary A significant IOR discovery was made in the Gamma Main Statfjord (GMS) structure within the Oseberg field in the North Sea. Rock physics and analysis of seismic inversion data was used to reduce uncertainty and to aid planning of production and injection wells. Introduction The Oseberg field is a large offshore field situated in the Norwegian sector of the North Sea 144 km west of Bergen. The main reservoir interval is fluvial to shallow marine sandstones in the Middle Jurassic Brent Group. The field consists of easterly rotated fault blocks with increasing erosion by the Base Cretaceous unconformity in the western part. In the Gamma Main structure most of the Brent interval is eroded, but the Lower Jurassic Statfjord Formation is left intact. The probability for a gas cap at the top of the structure The possibility of having different OWCs in Nansen and Eiriksson members Variations in the reservoir quality in the structure The plateau production of the Oseberg field ended in 1997. With decreasing production and remaining reserves, IOR becomes increasingly important. In November 2006 a significant IOR discovery was made in the GMS structure at Oseberg. A pilot well penetrated the Upper Statfjord Formation and found 80 meters TVT of oil in the Nansen and Eirikson members. This corresponds to expected volumes of 39.6 Mbbl oil and 31.8 bft3 gas in place. The discovery well did not penetrate the top of the structure. No oil-water contact was observed in the topmost Nansen member in the Upper Statfjord Formation. Due to this, analysis was performed of seismic inversion data together with rock physics models and data from nearby wells to address the following issues: Data Base Elastic inversion was carried out by CGG in 2005 based on a 4D survey acquired in 1999 and reprocessed in 2002. The inversion was targeted at the Statfjord Formation and limited to the western part of the Oseberg field. Cubes of acoustic impedance (AI) and Vp/Vs-ratio were used. The discovery well (30/9-B-19 AT3) was logged with density and resistivity but not with a sonic tool, so no direct comparison between well log and inversion data was possible in the investigated structure. Two nearby exploration wells (30/6-26 and 30/6-27) have sonic (P- and S-wave slowness) as well as density logs. Rock physics framework In order to do a quantitative interpretation of the inversion data, a rock physics framework was established based on logs from the exploration wells. The closest well is 30/6- 26, and this well has good sandstone intervals, but no shaly interval within the Upper Statfjord Formation. The only shale within the logged section is in the overlying Dunlin Group. As this is a marine clay, it is not representative for the silty shale within the Statfjord Formation. Well 30/6-27 is situated in the Kappa North structure further to the NW. Data from this well confirms the sandstone model and provides data for the shale within the Statfjord Formation.
- Geology > Geological Subdiscipline > Geomechanics (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.95)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.79)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (0.78)
- Geophysics > Seismic Surveying > Seismic Processing (0.70)
- Europe > Norway > North Sea > Northern North Sea > Statfjord Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 190 > Brent Group > Tarbert Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 104 > Block 30/9 > Oseberg Field > Tarbert Formation (0.99)
- (6 more...)
First Application of Advanced Resistivity Logging Technology for Real-Time Evaluation of Formation Properties and Structural Dips Estimation in Complex Geology of Krasnoleninskoe Field
Sviridov, Mikhail (Baker Hughes) | Antonov, Yuriy (Baker Hughes) | Kotov, Ruslan (Baker Hughes) | Nikulina, Irina (Baker Hughes) | Baranov, Vyacheslav (RUSPETRO)
Abstract The Tyumen formation is the main hydrocarbon-saturated layer of the Krasnoleninskoe oil and gas condensate field located in Western Siberia. This formation is characterized by significantly changing structural dips and represented as thin, interbedded shale and sandstone layers. Such a formation structure complicates the real-time evaluation of formation properties, well correlation and proper well placement. This paper presents the results of horizontal well drilling at the Krasnoleninskoe field using advanced resistivity logging technology. Advanced resistivity logging technology is used in field operations for various applications. This technology includes logging-while-drilling (LWD), a deep-azimuthal resistivity tool, and sophisticated data interpretation software. The tool performs multi-component, multi-spacing and multi-frequency measurements downhole. The measurement set can be configured individually for each particular geology and application type to ensure effective operations. Next, these measurements are transmitted to the surface, where high-performance multi-parametric inversion recovers formation parameters of interest in real-time. The inversion software enables the processing of any combination of tool measurements and is based on a 1D layer-cake model with an arbitrary number of layers to operate with complex multi-layer formations. Besides the complex laminated structure of the Tyumen formation, an additional challenge is the low resistivity contrast between the shale and sandstone interlayers. This factor is typical for many West-Siberian fields; it complicates the resolution of interlayers and degrades the evaluation accuracy of their parameters. To overcome these challenges, a set of deep-azimuthal resistivity tool measurements, suitable to resolve thinly laminated formations, was identified and transmitted uphole while drilling. Real-time inversion was performed in a user-controlled mode to ensure the careful tracking of geology changes. These results enabled operational geologists to monitor the formation properties during the drilling. Data inversion software ensured the accurate evaluation of formation properties and structural dips estimation in complex conditions of the Krasnoleninskoe field. Structural dips recovered by inversion significantly differed from values observed at offset wells, i.e., 5 to 12 degrees, instead of 0 to 2 degrees. A perfect match between the measured and synthetic resistivity data confirmed high confidence of inversion results. Moreover, there was a strong correlation between the structural dip angles estimated from resistivity data and derived from LWD natural gamma-ray (GR) image. Many of shale and sandstone layers observed in the GR curves were resolved by resistivity inversion. The depth of the remote layer detection was estimated during the job; it enabled geoscientists to delineate the reservoir volume that contributed to the tool measurements. This case study describes the first application of advanced resistivity logging technology in a complex laminated formation of the Krasnoleninskoe field. This technology enables the resolution of thin interlayers, evaluation of their properties and estimation of structural dips in real time. These parameters are important for proper well placement and accurate petrophysical interpretation. The presented technology is able to increase the efficiency of oil recovery in the complex laminated formations of the Russian West-Siberian fields.
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug (1.00)
- Asia > Russia > Ural Federal District > Tyumen Oblast > Tyumen (0.45)
- Geology > Structural Geology (1.00)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock > Shale (0.91)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.68)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > West Siberian Basin > Kamennoe Field (0.99)
- Asia > Russia > Ural Federal District > Yamalo-Nenets Autonomous Okrug > Purovsky District > West Siberian Basin (0.99)
- Asia > Russia > Ural Federal District > Khanty-Mansi Autonomous Okrug > West Siberian Basin > Talinskoye Field (0.99)
- (6 more...)
- 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)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (1.00)
Joint Inversion of MWD And Wireline Measurements
Chunduru, Raghu K. (Baker Hughes Incorporated) | Mezzatesta, Alberto G. (Baker Hughes Incorporated) | Meyer, Hal W. (Baker Hughes Incorporated) | Zhang, Zhiyi (Baker Hughes Incorporated) | Busch, Rainer (Baker Hughes Incorporated) | Maher, Tom (Shell Offshore Inc)
Inversion techniques allow for simultaneous processing of two data sets, leading Traditionally, measurement-while-drilling (MWD) data are to a consistent earth model that describes both data sets. In used primarily for geosteering purposes and drilling this study, a dual earth model that describes the appropriate decisions such as monitoring of hole direction, deviation, logging conditions of both wireline and MWD is proposed and delineation of abnormally pressured zones. Wireline and implemented on synthetic and a real data example from resistivity measurements, galvanic and induction, play a Gulf of Mexico. We also compare the resolution matched fundamental role in identifying and delineating oil-and curves of the MPR (Meyer et al., 1994) and HDIL gas-bearing formations.
- North America > United States (0.38)
- North America > Mexico (0.37)
Abstract The new reservoir mapping-while-drilling technology provides enough data so that a real-time reservoir map can be created through inversion for a layered medium. These reservoir maps are used to optimize well placement and to improve reservoir understanding. Complex reservoirs can be imaged, but the assumption of a layered medium loses its validity when the reservoir cannot be approximated using 1D model locally, i.e., when the reservoir structure varies on the scale of the tool spacing. To improve reservoir mapping performance in such scenarios, an unbiased approximate 2D inversion is introduced that minimizes the error to the layer medium approximation of the reservoir. It is suited for any mildly 2D scenario in which the reservoir does not change abruptly. The method is validated on synthetic and field datasets.
- Europe > Norway (0.30)
- Asia > Middle East > UAE (0.29)
- North America > United States (0.28)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Seismic Surveying > Seismic Processing (0.93)
- Well Drilling > Drilling Measurement, Data Acquisition and Automation > Logging while drilling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (1.00)