3D Fine Structure Interpretation And Potential Reservoir Distribution In Qian Dong-North Shen Jingzi Area Of Songliao Basin

Qian Dong-North Shen Jingzi area is located at Changling area of southern Songliao Basin. Fracture of the area is complex, small faults is developmental. Structure of the Area is concentrated in the nose fault and the block fault controlled by the small fault. Main purpose of the reservoir sandstone layers are thinner and lateral variation, connectivity is poor.3D seismic in this region to fine structural interpretation and analysis structural characteristics and reservoir forecasting, for the development of oil and gas exploration has important significance.This paper with 3D seismic data of studied area as the basis, structural Geology and Sequence stratigraphy theory as the guide, from the accurate calibration of the horizon and the stratigraphic framework establishment, applied techniques such as seismic data vertical profile and horizon-slice interpretation technique, eigenvalue related body technique, the 3D visualization technique, variable speed mapping technique etc, which are applied to fulfill the fine structural interpretation of 3D seismic data in studied area. A large quantities of small faults, small fault blocks and nose fault were found, which provides the reliable foundation material for study the structural characteristics of the area, evaluate and select exploration target. The study of structural characteristics show that: the overall structural features of the study area showed a slope of southeast high northwest low, with possess"double composite structure of rift and depression". Patterns of profile and plane structures of the faults in this area are studied through the analysis of structural map and seismic section. According to the fault activity time, scale, and the control of sedimentation, structure, the fault can be divided into three types. Through the analysis of structural evolution section of faults that can be divided into three stages. Combined with regional tectonic background, through the analysis of the formation mechanism of fault in study area. Faulted phase and the depression of regional extension faults are formed under the action of stress. Based on identification and implementation of the trap, to study the characteristics of the trap. In consideration of the forecasting difficulties towards the main purpose layer in this area, application of a variety of seismic inversion method and seismic attribute analysis technique to study the reservoir characteristics, combined with the result of fine structural interpretation, which provides the solid foundation for exploration, reservoir evaluation, and exploit oil and gas.Through the comprehensive evaluation of the main purpose layers, choosing nine exploration targets.