Efficient and fine seismic structure interpretation in Wuerxun Depression and Beier Depression
LEI Ming1, CHEN Guangpo1, ZENG Yongjun1, LUO Zhaoyang2, MA Fengliang1, WANG Jiang3
1. Northwest Branch Research Institute of Petroleum Exploration & Development, PetroChina, Lanzhou, Gansu 730020, China; 2. School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 3. Exploration and Development Research Institute, Daqing Oilfield Company Limited, Daqing, Heilongjiang 163712, China
Abstract：Wuerxun Depression and Beier Depression are oil-rich sags in the central faulted zone of the Hailar Basin,which have already entered in the stage of comprehensive exploration and fine excavation,and still have great potential.Due to the differences in depression structures,structural development degrees,sedimentary sequences,diffe-rent exploration deployments,and seismic data li-mits,these two adjacent depressions have not been systematically studied as a whole area.With tools provided by GeoEast Interpretation Sub-system,we unify geological frameworks and sedimentary sequences on a 3510km2 prestack-depth-migration seismic data volume.Based on sequence stratigraphy and taking unconformities as sequence boundaries,sedimentary geology is stratified.Combining borehole and seismic data,we achieve a 19-isochrone seismic frame,and unify 8 sets of Lower Cretaceous strata and their 14 targets.At the same time,fracture systems are classified,and fault interpretation and horizon tracking in a 1900km2 area of Wuerxun Depression are completed.Also,the velocity modeling and variable-velocity mapping are fulfilled.The depth error of tectonic maps is within the industry standard.Our work lays a very solid foundation for the future comprehensive geological research including fault mechanism,basin evolution,sedimentary construction,favorable zone,and hydrocarbon migration.
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