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Collaborating Authors
Palaeogeography and Palaeoenvironments – A Multifield Examination of the Devonian-Permian Evolution of the Dneipr-Donets Basin
Banks, Christopher James (Schlumberger) | Bodnaruk, Bohdan (UGV) | Kalmutskyi, Vladislav (UGV) | Seilov, Yerlan (Schlumberger) | Zhiyenkulov, Murat (Schlumberger) | Oni, Olugbena (Schlumberger)
Abstract Context is everything. Not all thick sands pay out and not all thin sands are poorly productive. It is important to understand a basin's palaeogeographical drivers, the resultant palaeoenvironments and their constituent sedimentary architecture. Development of a depositional model can be predictive with respect to the magnitude of accessible pore space for potential development. We present a multi-field study of the Dneipr-Donets basin. Over 600 wells were studied with >4500 lithostratigraphical picks being made. Over 7500 sedimentological picks were made allowing mapping of facies bodies and charting shifts in facies types. A facies classification scheme was developed and applied. The Devonian-Permian sedimentary section records the creation, fill, and terminal closure of the Dneipr-Donets Basin:Syn-rift brittle extension (late Frasnian-Famennian): intracratonic rifting between the Ukrainian Shield and Voronezh Massif formed a NW-SE orientated trough, with associated basaltic extrusion. Basin architecture consists of rotated fault blocks forming graben mini-basins. Sedimentation is dominantly upper shoreface but sand packages are poorly correlatable due to the faulted palaeotopography. Early Post-rift thermal subsidence (Visean-Lower Bashkirian): the faulted palaeotopography was filled and thermal subsidence drove basin deepening. Cyclical successions of offshore, lower shoreface and upper shoreface dominate. Sands are typically thin (<10m) but can be widely correlated and have high pore space connectivity. Mid Post-rift: the Bashkirian (C22/C23 boundary), paralic systems prograde over the shoreface. Changes in vertical facies are abrupt due to a low gradient to basin floor. Deltaic and fluvial facies can produce thick amalgamated sands (>30m), but access limited pore space because they are laterally restricted bodies. Terminal post-rift (Mykytivskan): above the lower Permian, the convergence of the Kazahkstanian and Siberian continents began to restrict the Dnieper-Donets basin's access to open ocean. The basin approached full conditions and deposition was dominated by evaporite precipitation, with periodic oceanic recharge. Ultimately, this sediment records the formation of Pangea. The successions examined were used to construct a basinal relative sea level curve, which can be applied elsewhere in the basin. This can be used to help provide palaeogeographical context to a field, which in turn controls the sedimentary architecture.
- North America (0.93)
- Europe > Ukraine (0.88)
- Europe > Russia > Central Federal District > Voronezh Oblast > Voronezh (0.24)
- Phanerozoic > Paleozoic > Devonian > Upper Devonian (1.00)
- Phanerozoic > Paleozoic > Carboniferous > Pennsylvanian > Middle Pennsylvanian > Moscovian (0.93)
- Phanerozoic > Paleozoic > Carboniferous > Pennsylvanian > Lower Pennsylvanian > Bashkirian (0.88)
- Geology > Structural Geology > Fault (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Mudrock (0.70)
- Geology > Structural Geology > Tectonics > Extensional Tectonics (0.68)
- (4 more...)
- Europe > Ukraine > Dnieper-Donets Basin (0.99)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.97)
- North America > United States > Texas > Permian Basin > Yates Formation (0.97)
- (22 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Sedimentology (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 New geological structures - displaced blocks of salt diapirs’ overburden - were identified in the axial part of the Dnieper-Donets basin (DDB) beside one of the largest salt domes due to modern high-precision gravity and magnetic surveys and their joint 3D inversion with seismic and well log data. Superposition of gravity lineaments and wells penetrating Middle and Lower Carboniferous below Permian and Upper Carboniferous sediments in proximity to salt allowed to propose halokinetic model salt overburden displacement, assuming Upper Carboniferous reactivation. Analogy with rafts and carapaces of the Gulf of Mexico is considered in terms of magnitude of salt- induced deformations. Density of Carboniferous rocks within the displaced flaps evidence a high probability of hydrocarbon saturation. Possible traps include uplifted parts of the overturned flaps, abutting Upper Carboniferous reservoirs, and underlying Carboniferous sequence. Play elements are analyzed using analogues from the Dnieper-Donets basin and the Gulf of Mexico. Hydrocarbon reserves of the overturned flaps within the study area are estimated to exceed Q50 (P50) = 150 million cubic meters of oil equivalent.
- Europe > Ukraine (1.00)
- North America > United States > Gulf of Mexico > Central GOM (0.28)
- Phanerozoic > Paleozoic > Carboniferous > Mississippian > Middle Mississippian > Visean (1.00)
- Phanerozoic > Paleozoic > Carboniferous > Pennsylvanian (0.90)
- Geophysics > Magnetic Surveying (1.00)
- Geophysics > Gravity Surveying (1.00)
- Geophysics > Seismic Surveying > Surface Seismic Acquisition (0.46)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.68)
- North America > United States > Gulf of Mexico > Central GOM > West Gulf Coast Tertiary Basin > Keathley Canyon > Block 292 > Kaskida Field (0.99)
- North America > United States > Gulf of Mexico > Central GOM > East Gulf Coast Tertiary Basin > Mississippi Canyon > Block 392 > Appomattox Field (0.99)
- North America > Canada > Saskatchewan > Williston Basin > Charles Formation (0.99)
- Europe > Ukraine > Dnieper-Donets Basin (0.99)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management (1.00)
Advances in Cased-Hole Formation Evaluation—The Access to Untapped Tight-Gas Resources in Mature Fields: A Case Study from the Dnieper-Donets Basin, Ukraine
Zambrano, Rafael (Ukrnaftoburinnya PJSC) | Makar, Yevhen (Ukrnaftoburinnya PJSC) | Sadivnyk, Michael (Ukrnaftoburinnya PJSC) | Butenko, Andriy (Ukrnaftoburinnya PJSC) | Doroshenko, Oleksandr (Ukrnaftoburinnya PJSC) | Novikov, Volodymyr (Ukrnaftoburinnya PJSC) | Cimic, Miljenko (Ukrnaftoburinnya PJSC) | Cavalleri, Chiara (Schlumberger) | Ahmad, Samira (Schlumberger) | Akashev, Yernur (Schlumberger)
Abstract The Sakhalin Field is located in the Dnieper-Donets Basin, east of Ukraine, and has been producing 7.7 billion cubic meters of natural gas in place from carboniferous rocks since the 1980s. Notwithstanding, it is strongly believed that significant untapped resources remain in the field, specifically those classified as tight intervals. Advances in wireline logging technology have brought, besides better accuracy on measurements behind the casing, a new measurement called fast neutron cross-section (FNXS), which has proved to be sensitive enough to the volume of gas in low-porosity formations. This enabled a quantitative interpretation for a better understanding of where these additional resources may lie in the Sakhalin Field. The methodology is based on advanced pulsed neutron spectroscopy logs to assess the essential formation properties such as lithology, porosity, and gas saturation and reduce the evaluation uncertainty in potential tight gas intervals. The advanced technology combines measurements from multiple detectors that represent independent formation properties such as formation sigma, thermal neutron porosity, FNXS, and elemental fractions. To address the lithology, the tool measures directly the rock elements required to determine representative mineralogy and matrix properties, which in turn are used to compensate for the matrix effects and obtain a reliable porosity and gas volume estimation. The methodology was tested on the upper Visean productive zones (Mississippian epoch) characterized by its low porosity (<10 pu) and permeability (<10 mD). In the past, those intervals have been overlooked because of inconclusive petrophysical interpretation based on basic openhole logs and their low production in some areas of the field. The necessity to finding new reserves has motivated the re-evaluation of possible bypassed tight-gas intervals by logging of mature wells behind casing in different sectors of the field. Advanced pulsed neutron spectroscopy logging behind casing uniquely identifies reserves in tight-gas intervals where basic open-hole interpretations were ambiguous. The gas production obtained from the perforated intervals supports the formation evaluation parameters estimated from the standalone interpretation of the pulsed neutron data. This work describes in detail the application of the alternative methodology and interpretation workflow to evaluate the formation through the casing. A concrete example is presented to illustrate the effectiveness of this approach in the revealing and development of tight gas reservoirs in mature fields in the Dnieper-Donets Basin.
- Europe > Ukraine (1.00)
- North America > United States > Texas (0.47)
- Asia > Russia > Far Eastern Federal District > Sakhalin Oblast (0.45)
- Geology > Geological Subdiscipline (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.71)
- Geology > Mineral > Silicate > Phyllosilicate (0.51)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.68)
- North America > United States > Texas > West Gulf Coast Tertiary Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Sabinas - Rio Grande Basin > Eagle Ford Shale Formation (0.99)
- North America > United States > Texas > Maverick Basin > Eagle Ford Shale Formation (0.99)
- (6 more...)
Application of Outcrop Analogs to Characterize Carbonate Reservoirs in the Pricaspian Basin
Kenter, Jeroen A. (Chevron Energy Technology Company) | Playton, Ted (Chevron Energy Technology Company) | Harries, Paul (Mitch) (Chevron Energy Technology Company) | Katz, David (Chevron Energy Technology Company) | Bellian, Jerry (Chevron Energy Technology Company)
Abstract Slope systems flanking high-rising isolated carbonate platforms and dominated by "deep-reef" microbial boundstone are heterogeneous due to a spectrum of depositional processes that cause a high degree of vertical and lateral variability. In addition, they are conceptually complex as a result of their poorly understood depositional controls and insensitivity to sea level fluctuations. The nature of the margins and slopes of the giant carbonate reservoirs of the Pricaspian Basin remains a controversial topic. Among the reasons is the poor quality of seismic data due to overlying salt as well as the lack of depositional models explaining their spatial distribution and seismic response. The use of analogs, in particular those from the Carboniferous of Spain, the Permian of New Mexico and Texas (USA), the Devonian of the Canning Basin (Australia), and the Triassic of the Dolomites (Italy), provide highly valuable depositional models. Intact and seismic-scale outcrops in northern Spain, USA and Italy proved the existence of deep-reef microbial boundstone slopes that characteristically display high progradation rates, propensity for fracturing and collapse, and insensitivity to sea level. Cores from the Tengiz and Karachaganak fields, when tied with reflection terminations and log character, confirm the presence of such slopes, leading to a radical change in the depositional and reservoir models. Results from the Canning Basin and Permian Basin provided models for margin styles and the detrital portions of slope systems that were successfully applied to portions of the fields. Seismic geomorphology and stratigraphic interpretation, guided by understandings from outcrops, allowed for the subdivision into multiple styles of clinoforms, slope and basin sediment wedges, margin configurations, and secondary features (i.e. reentrants). These revised subdivisions better conform to and explain the observed trends in reservoir properties and connectivity of the fields. Thus, integration of depositional models derived from outcrop analogs with seismic facies analysis, cores, log character and static and dynamic data is a critical step in reducing uncertainty and improving reservoir characterization, especially in cases where seismic response is obscured and well data is limited.
- Oceania > Australia (1.00)
- North America > United States > Texas (1.00)
- Phanerozoic > Paleozoic > Permian (1.00)
- Phanerozoic > Paleozoic > Devonian > Upper Devonian (1.00)
- Phanerozoic > Paleozoic > Carboniferous > Pennsylvanian (1.00)
- (2 more...)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Marine Environment > Reef Environment (0.68)
- North America > United States > Texas > Permian Basin > Delaware Basin (0.99)
- North America > United States > New Mexico > Permian Basin > Delaware Basin (0.99)
- Asia > Kazakhstan > West Kazakhstan > Uralsk Region > Precaspian Basin > Karachaganak Field (0.99)
- (26 more...)
Conditions of the Formation Gas Deposits in the Epart of the Dnieper-Donets Basin: Integration of Basin Modeling Data with Consequences of Strike-Slip Faulting Effects
Privalov, Vitaliy (Naftogaz Group) | Loktyev, Valentyn (Naftogaz Group) | Misch, David (Montanuniversität Leoben) | Sachsenhofer, Reinhard (Montanuniversität Leoben) | Karpenko, Ivan (Naftogaz Group) | Panova, Olena (Institute of Geochemistry, Mineralogy and Ore Formation, NAS of Ukraine)
Abstract Since 1950, when the megascale Shebelinka deposit was found in the north-eastern portion of the Dnieper-Donets basin (DDB) this district has been served as a heartland of the hydrocarbon extraction in Ukraine. Right now, this area is again facing a new wave of commercial interest. Most conventional hydrocarbon plays here contain natural gas and liquid gas accumulated in numerous clastic and fractured horizons throughout Carboniferous to Lower Permian successions. The numerical basin modelling in the Donbas segment indicated that organic-rich sediments are thermally mature in the deep levels of the basin. Our interpretation of the structural patterns within the study area suggests that the kinematic development of the fracture sets is consistent with the model of development of subsidiary structures within the dextral strike-slip zone. Nearly all gas and gas condensate fields in the eastern part of the DDB may be classified as naturally fractured reservoirs in fault-breached anticlinal traps associated with releasing jogs in strike-slip assemblages. Gaseous hydrocarbons generated in deep "gas window" compartments have escaped here via several fracture corridors forming "sweet spots " sites. The main objective of this contribution is to get an insight into the style and structural trends of formation structural traps of hydrocarbons which in concert with basin modeling technologies will ensure proper technical decisions for the efficient exploration and production of gas reservoirs. This research summarizes new insights into gas deposits formation in the eastern part of DDB based on a synthetic approach ascertaining a vital connection of basin modeling results with the spatial distribution of kinematically induced releasing jogs which facilitating magnified fluid-and-gas conductivity.
- Europe > Ukraine > Luhansk Oblast (0.31)
- Europe > Ukraine > Donetsk Oblast (0.31)
- Phanerozoic > Paleozoic > Permian (1.00)
- Phanerozoic > Paleozoic > Carboniferous > Mississippian > Middle Mississippian > Visean (0.47)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (1.00)
- Geology > Sedimentary Geology > Depositional Environment (1.00)
- Geology > Sedimentary Basin (1.00)
- (3 more...)
- Europe > Ukraine > Kharkiv Oblast > Dnieper-Donets Basin > Shebelinka Field (0.99)
- Europe > Ukraine > Dnieper-Donets Basin (0.99)
- Europe > Belarus > Pripyat Basin (0.99)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Naturally-fractured reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Faults and fracture characterization (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)