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Geophysical forecasting of deep reservoirs in the Z gas field |
HE Xian-Ke1(), LOU Min1(), LI Bing-Ying1, LIU Jiang1, HU Wei1, CAI Hua2 |
1. Shanghai Branch of CNOOC, Ltd., Shanghai 200335, China 2. CNOOC Research Institute Co., Ltd., Beijing 100028, China |
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Abstract Fine-scale characterization of reservoirs is critical for oil and gas exploration and production. Reservoirs in the Z gas field exhibit considerable burial depths and superposed sandstone and mudstone impedance characterized by dark spots, complicating their identification using conventional seismic methods. This study achieved the characterization of deep reservoirs in the Z gas field based on the dominant-channel stacking technique. First of all, this study analyzed the seismic response characteristics of deep reservoirs through forward modeling, positing that poor physical properties are the primary factor contributing to the formation of dark spots. Then, starting with the investigation of the near-well prestack gathers of the target layer, this study examined their amplitude variation with offset (AVO) characteristics and seismic phase stability at different angles, determining the dominant-angle seismic channels that can accurately reflect the phase stability of reservoirs. Finally, this study derived a lithology-sensitive 3D data volume through partial stacking of dominant-angle seismic channels, achieving the characterization of deep reservoirs. The near-trace superimposition (3°~15°) of phase-shift seismic data (-90°) allowed for effectively characterized the H3a reservoir in the Z gas field, providing a geophysical basis for subsequent well deployment. Therefore, the dominant-channel stacking technique can effectively characterize the spatial distribution of deep river-channel reservoirs, guiding the reservoir characterization of similar oil and gas fields.
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Received: 22 August 2023
Published: 27 June 2024
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Well location map and stratigraphic column map
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Post stack seismic profile along the wells
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Calibration synthetic records
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Forward modeling and seismic profile
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Prestack AVO forward modeling of different porosity reservoir
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Comparison of seismic data by removing multiple waves
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Seismic gathers (a)and AVO curve characteristics(b) of layer H3a
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Comparison of VSP corridor stacking traces, synthetic records, and seismic profiles
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Comparison between post stacked profile (a) and advantage trace stacking profile (b)
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Sand body thickness and well location of H3a layer
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Typical seismic profile for pinch out of H3a layer
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