Origin analysis of the large-scale shallow gas-obscured zone: an example of the Oilfield A, Bohai Bay
MING Jun1, ZOU Zhen2, XIA Tongxing1, CAO Sheng2, and LIU Lei1
1. Bohai Oilfield Research Institute, Tianjin Branch, CNOOC, Tianjin 300452, China;
2. Geological Research Center, GRI, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract:A large-scale gas cloud zone in the Oilfield A,Bo-hai Bay causes poor quality of P wave data,so subsurface structures are very difficult to be depicted.Based on multi-discipline information including surface seismic,VSP,and geologic data,we build a number of 2D and 3D models and achieve the forward modeling based on acoustic equation and synthetic data evaluation.According to our research,the seismic wave scattering caused by shallow large-scale heterogeneous stratum(shallow gas zone) is an important reason for blurring seismic imaging of gas cloud zone.The sag structure perpendicular to the long axis direction of shallow gas further aggravates the imaging difficulty on existing 3D seismic data(acquisition along the long axis direction of shallow gas zone).Real data processing shows that the near-surface velocity provided by turning-ray tomography,and wave equation prestack depth migration(PSDM) with multi-wave arrivals can improve the imaging quality of P-wave in the gas cloud zone.
明君, 邹振, 夏同星, 曹盛, 刘垒. 大规模气云区成因分析——以渤海湾A油田为例[J]. 石油地球物理勘探, 2019, 54(2): 312-319.
MING Jun, ZOU Zhen, XIA Tongxing, CAO Sheng, and LIU Lei. Origin analysis of the large-scale shallow gas-obscured zone: an example of the Oilfield A, Bohai Bay. Oil Geophysical Prospecting, 2019, 54(2): 312-319.
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