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《Geotectonica Et Metallogenia》 2005-02
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RELATIONSHIP BETWEEN INVERSION STRUCTURES AND HYDROCARBON ACCUMULATION IN SHIWU FAULT DEPRESSION OF SONGLIAO BASIN

ZHANG Qinglin~1, TONG Dianjun~1 and WANG Mingjun~2 (1. Faculty of Earth Resources, China University of Geosciences, Wuhan, HB 430074, China; 2. Chinese Academy of Geological Sciences, Beijing 100037, China)  
The late stage strong inversion structures are an important characteristic of Shiwu fault depression during the process of tectonic evolution. Based on the high-resolution 3-D seismic profiles and by applying several geophysical techniques such as coherence technique and 3-D visualization, the authors divided the inversion structures in the study area into four inversion structure traps. Two kinds of new inversion structural styles including tyrannizing fault and truncated inversion structure are first found in Shiwu fault depression even in Songliao basin on the basis of restudying the forms of inversion structures. Further more, except the detachment-type fold in depression formation, the inversion structural styles can be subdivided into five types: reviving type, forward-expanding type, backward-expanding type, tyrannizing type and truncated type according to the mode of association of the thrust faults and the early normal faults. Finally, the inversion structures in the study area show very good reservoir-forming conditions. And the four inversion structure traps show different trap types and different hydrocarbon accumulation characteristics. The hydrocarbon reservoir-forming model based on the inversion structures in the study area has been summed up. And the authors hold that it will be of benefits to oil and gas exploration in the future.
【Fund】: 国家自然科学基金资助(编号: 40372067)
【CateGory Index】: P542.3;P618.13
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