• 责任者：Xie Zhaohan (Earth Science Institute ; Northeast Petroleum University ; Daqing 163318 ; China) ; Fu Xiaofei
• 刊名：Chinese Journal of Geology
• 出版年：2013
• 卷期：48(3)
• 关键词：断裂 ; fractures ; 油气藏 ; oil and gas reservoir ; 松辽平原 ; Songliao Plain
• 页码：p.891-907
• 图表：8 illus., 42 refs.
• 分类号：1003
• issnNo：ISSN0563-5020
• isbnNo：CN11-1937/P

     In Songliao Basin, high density fault in T2 reflecting interface and ＂decanting＂ migration and accumulation in Fuyang reservoir are closely relate, its genetic mechanism are highly concerned from the geologists, there are a variety of hypotheses of tectonic origin and hydraulic fault. This paper systematically study on the geometry of the ＂T2 ＂ fault, the dominant N-S trending fault, the power-law distribution characteristics of displacement and length, dense zone,＂ flower-like＂ composite pattern with fault in rifting, characteristics of the multi-phase activity in the part of the fault are different from non-tectonic origin polygonal fault which generate from overpressure cyclical release, is typical tectonic origin fault. The causes of the high density fault and dense zone in T2 can be attributed into three factors： first, Songliao depressed basin has strong strenching during the Qingshankou deposited, the low shear strength in mudstone lead to fracture,is the premise of high density fault formation; second, basement- rifting fault,volcanic vent and uplifted bed rock as early weak belts, control the formation of the depressed fault and dense zone, is the primary cause of the high density fault formation ; third, plastic mudstone detachment horizontal during depression, making the rifting fault and the depressed fault can＇t link up, T2 and T~ fault lack of perforation, this is the favorable security for development of the high density fault in only T2 reflecting layer. The activity of the overall Sanzhao depression in tectonic inversion period is weak, polygonal fault in fault dense zone selective activity, extends upwardly to above T06 reflection layer, the fault in inversion is active during the source rock generate and expulse abundance hydrocarbon, these faults are advantageous channel fault for Fuyang and Putaohua oil layers, control the migration, accumulation and distribution of the Fuyang and Putaohua reservoir.