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Collaborating Authors
Northern North Sea
Combined onshore and offshore wide scale seismic data acquisition and imaging for CCS exploration in Havns, Denmark
Zappal, Samuel (Uppsala University) | Malehmir, Alireza (Uppsala University) | Papadopoulou, Myrto (Uppsala University) | Gregersen, Ulrik (Geological Survey of Denmark and Greenland (GEUS)) | Funck, Thomas (Geological Survey of Denmark and Greenland (GEUS)) | Clausen, Ole R. (Aarhus University) | Nrmark, Egon (Aarhus University)
Strong global actions for climate change include carbon capture and storage (CCS) as a feasible solution to reach carbon neutrality and raise opportunities for detailed subsurface investigations. An acquisition set-up designed for onshore-offshore zones was maximized for a wide-scale high-resolution structural imaging and implemented to cover a domal structure of interest for CCS utilization close to the town of Havns�nmark). Challenges of a combined acquisition and processing of land and marine multi-sensor data along a 42 km seismic profile are analyzed, suggested solutions are applied and limitations discussed. On the onshore side, a nodal array and a seismic landstreamer system were simultaneously used while along the transition zone a marine seismic streamer and ocean bottom seismometers were added to record the seismic response generated by two seismic vibrator sources. The adopted sensing domains (velocity, acceleration, and pressure) were studied and different processing steps were evaluated to enable their processing and subsequent data set merging. Results suggest as a best approach, a separate prestack processing of the different data sets and the computation of new geometries and new surface-consistent residual static correction after their merging. The data acquired in the transition zone illuminate for the first time the subsurface geology of the region delineating an expected domal closure. The final seismic section shows high continuity of the reflections with good resolution along the entire profile, identifying the main reservoir structure and the surrounding areas, which are important to ensure the reservoir integrity and safe exploitation over longer time scales. Shallow and deep reflections are consistent with the stratigraphic column from a well-log near the profile. The presented study shows a comprehensive workflow for processing such a multi-sensor data set in onshore and transition zone settings.
- Europe > Denmark (1.00)
- North America > United States > Illinois > Madison County (0.24)
- Research Report > New Finding (0.66)
- Research Report > Experimental Study (0.48)
- Geology > Geological Subdiscipline > Stratigraphy (1.00)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.46)
- Geophysics > Seismic Surveying > Surface Seismic Acquisition > Marine Seismic Acquisition (1.00)
- Geophysics > Seismic Surveying > Surface Seismic Acquisition > Land Seismic Acquisition (1.00)
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (1.00)
- Europe > Norway > North Sea > Central North Sea > Central Graben > PL 019 > Gassum Formation (0.99)
- Oceania > Australia > Victoria > Bass Strait > Gippsland Basin (0.89)
- North America > Canada > Alberta > Border Field > Anglo Pacific Et Al Czar 11-33-41-5 Well (0.89)
- (5 more...)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 043 > Block 30/7 > Martin Linge Field > Tarbert Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 043 > Block 30/7 > Martin Linge Field > Ness Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 043 > Block 30/7 > Martin Linge Field > Lunde Formation (0.99)
- (29 more...)
- Well Drilling (1.00)
- Well Completion > Sand Control > Gravel pack design & evaluation (1.00)
Seventeen companies have been offered a total of 24 licenses in the second round of the North Sea Transition Authority's (NSTA) 33rd oil and gas licensing round. Of the 17 companies, several supermajors including Equinor, BP, Shell, and TotalEnergies secured licenses for 74 blocks and part-blocks in the Central North Sea, Northern North Sea, and West of Shetland areas. Remaining blocks in the Southern North Sea and East Irish Sea will be offered when environmental evaluations are finalized by the UK Offshore Petroleum Regulator for Environment and Decommissioning. These awards follow the 27 licenses offered in the first allocation made in October 2023 which consisted of 931 blocks and part-blocks available in the same locations. The application window closed in January 2023 with 115 bids coming in from 76 companies.
- Europe > North Sea (1.00)
- Europe > United Kingdom > North Sea (0.93)
- Europe > Norway > North Sea (0.93)
- (2 more...)
- Africa > Namibia > South Atlantic Ocean > Orange Basin (0.99)
- Africa > Nigeria > Gulf of Guinea > Niger Delta > Niger Delta Basin > OML 130 (0.98)
- Africa > Angola > South Atlantic Ocean > Lower Congo Basin > PSVM Development Area > Block 31 > Venus Field > Venus Well (0.98)
- (13 more...)
The Nova field is in the northeastern North Sea. Reservoir sands are at depths of 2500–2800 m, with a pressure of approximately 290 bar and temperatures up to 110 C. The field will be operated with six wells--three oil producers and three water injectors--with an injector/producer pair in each of the main fault compartments.
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 418 > Block 35/9 > Nova Field > Viking Formation > Heather Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 418 > Block 35/9 > Nova Field > Rannoch Formation > Heather Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > North Viking Graben > PL 418 > Block 35/8 > Nova Field > Viking Formation > Heather Formation (0.99)
- (3 more...)
- North America > United States > Oklahoma (0.20)
- North America > United States > Illinois (0.20)
- Africa > Middle East > Egypt (0.20)
- North America > United States > Oklahoma > Arkoma Basin > Cana Woodford Shale Formation (0.99)
- North America > United States > Oklahoma > Anadarko Basin > Cana Woodford Shale Formation (0.99)
- North America > United States > Kentucky > Illinois Basin (0.99)
- (10 more...)
ABSTRACT We describe, implement, and show the results of a localized ensemble-based approach for seismic amplitude-variation-with-offset (AVO) inversion with uncertainty quantification. Ensembles are simulated from prior probability distributions for fluid saturations and clay content. Starting with continuous saturations and clay content variables, we use depth-varying models for cementation and grain contact theory, Gassmann fluid substitution with mixed saturations, and approximations to the Zoeppritz equations for the AVO attributes at the top-reservoir. The local conditioning to seismic AVO observations relies on (1) the misfit between ensemble simulated seismic AVO data and the field observations in a local partition of the grid/local patch, of inlines/crosslines around the locations where we aim to predict, (2) correlations between the simulated reservoir properties and the data in local patches, and (3) local assessment to avoid unrealistic updates based on spurious correlations in the ensembles. Data from the Alvheim field in the North Sea are used to demonstrate the approach. The influence of the prior information from the well logs in combination with the seismic reflection data indicates the presence of higher oil and gas saturation in the lobe structures of the field and increased clay content at their edges.
- Geology > Mineral > Silicate > Phyllosilicate (0.93)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.93)
- Geology > Geological Subdiscipline > Geomechanics (0.84)
- Europe > Norway > North Sea > Northern North Sea > South Viking Graben > Vana Basin > RL 088 BS > Block 25/4 > Alvheim Field > Lista Formation > Våle Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > South Viking Graben > Vana Basin > RL 088 BS > Block 25/4 > Alvheim Field > Lista Formation > A2 North Heimdal T60 Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > South Viking Graben > Vana Basin > RL 088 BS > Block 25/4 > Alvheim Field > Hermod Formation > Våle Formation (0.99)
- (25 more...)
Abstract The geology toolkit that is used to reveal faults and fractures is much wider than before. This is due to 3D and 4D views in exploratory statistics programs and to the availability of user-friendly GIS software. These tools allow us to visualize a multitude of parameters that will be briefly explored here. A review of many geologic and nongeologic parameters led to evidence of fault locking and alternate fault activity. It also resulted in new structural models for the Western Canadian Sedimentary Basin (WCSB). The presented data sets include earthquakes, drilling, production, well data, aeromagnetic data, and more. Various integrated approaches reveal well-defined fault patterns that are typical of a strike-slip regime and the existence of previously unrecognized detachments that are important for hydrocarbon exploration. Some of the new geometries and associated mechanisms are illustrated here with outcrop analogues and present-day cross sections, maps, and 3D views. Only the most recent of the two identified strike-slip regimes is covered in this paper. Some emphasis is given to the recognition of detachments at various scales. Among these is the importance of megadetachments displacing the sedimentary cover by up to 16 km with respect to the aeromag. Hence, there is a need for reconstruction before making conclusions. The WCSB has a lot more to offer to explorers who understand faults, fractures, and migration paths. Integrating many types of information in map or 3D views offers new tools to identify and characterize faults.
- North America > Canada > Saskatchewan (1.00)
- North America > Canada > Northwest Territories (1.00)
- North America > Canada > Manitoba (1.00)
- (2 more...)
- Phanerozoic > Mesozoic (0.69)
- Phanerozoic > Paleozoic (0.68)
- Phanerozoic > Cenozoic > Paleogene (0.46)
- Geology > Structural Geology > Tectonics > Plate Tectonics > Earthquake (1.00)
- Geology > Structural Geology > Fault (1.00)
- Geology > Rock Type > Sedimentary Rock (1.00)
- Geophysics > Seismic Surveying (1.00)
- Geophysics > Borehole Geophysics (1.00)
- Geophysics > Magnetic Surveying > Magnetic Acquisition > Airborne Magnetic Acquisition (0.91)
- North America > Canada > Saskatchewan > Western Canada Sedimentary Basin > Alberta Basin (0.99)
- North America > Canada > Northwest Territories > Western Canada Sedimentary Basin > Alberta Basin (0.99)
- North America > Canada > Manitoba > Western Canada Sedimentary Basin > Alberta Basin (0.99)
- (39 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Geologic modeling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Faults and fracture characterization (1.00)
- (2 more...)
ABSTRACT In this article, the Editor of G provides an overview of all technical articles in this issue of the journal.
- North America > United States > Texas (0.28)
- North America > Canada (0.28)
- Geology > Geological Subdiscipline > Geomechanics (0.47)
- Geology > Geological Subdiscipline > Stratigraphy (0.47)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.47)
- 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)
- (46 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Near-well and vertical seismic profiles (1.00)
- Data Science & Engineering Analytics > Information Management and Systems > Artificial intelligence (1.00)
- (2 more...)
The Mula River basin is in an active tectonic region of the Kirthar fold fault belt in Western Himalayas. The presence of numerous major faults like Chaman Fault, Kirthar Frontal Fault and Bannh Fault near the study suggest complex tectonic processes in the region. The seismic record of the study area also indicates that this area is tectonically active. This makes the study area an ideal site to measure tectonic activity through geomorphic indices like hypsometric integrals (HI). For tectonic analysis of the Mula River basin, we divided the study area into 309 sub-basins. The results obtained from the HI calculations for the sub-basins led us to the classification of the study area into three classes i.e., Class 1 (0.51-0.78), Class 2 (0.37 0.50) and Class 3 (<0.37), where Class 1 is for the highest tectonic activity and Class 2 responds to the moderate and class 3 is for the lowest tectonic activity. We calculated the hypsometric curves to understand the geomorphological cycle of the Mula River basin. We quantified the sub-basins of the Mula River basin, inside the highly active tectonic zone of Kirthar fold and fault zone, as per their tectonic activity and found that a major portion of the study area shows low tectonic activity (44.33%), medium tectonically active and high tectonically active sub-basins are 37.86 % and 17.79 % respectively. These findings are supported by the presence of high-relief areas and known faults in the study area.
- Geology > Structural Geology > Tectonics > Plate Tectonics > Earthquake (0.95)
- Geology > Structural Geology > Tectonics > Compressional Tectonics > Fold and Thrust Belt (0.83)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Statfjord Group (0.99)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Lunde Formation (0.99)
- Europe > Norway > North Sea > Northern North Sea > East Shetland Basin > PL 050 > Block 34/10 > Gullfaks Field > Lista Formation (0.99)
- (5 more...)
In this article, the Editor of G provides an overview of all technical articles in this issue of the journal.
- North America > United States > Texas (0.28)
- North America > Canada (0.28)
- Asia > China (0.24)
- Geology > Geological Subdiscipline > Geomechanics (0.47)
- Geology > Geological Subdiscipline > Stratigraphy (0.47)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock (0.47)
- Energy > Oil & Gas > Upstream (1.00)
- Energy > Renewable > Geothermal > Geothermal Resource (0.34)
- 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)
- (46 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic processing and interpretation (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Seismic modeling (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Near-well and vertical seismic profiles (1.00)
- (3 more...)