Structural Analysis of Faulting System Origin in the Nanpu Sag, Bohai Bay Basin
详细信息
- 责任者：Tong Hengmao (State Key Laboratory of Petroleum Resource and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Zhao Baoyin
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(11)
- 关键词：断裂 ; fractures ; 构造分析 ; structural analysis ; 南堡凹陷 ; Nanpu Sag
- 页码：p.1647-1661
- 图表：13 illus., 1 table, 37 refs.
- 分类号：0300
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
On the basis of structural analysis of 3Dseismic data in Nanpu sag,and in combination with faulting model with pre`existing weaknesses and sand modeling results,the fault system and structural styles in the Nanpu sag were systematically analyzed.The results show that the structural style is typical oblique extension.The complicated "Y" shaped style,which is jointly controlled by listric(or ramp-flat)boundary normal faults and pre-existing faults,is the basic structural style in the Nanpu sag,followed by complicated "X" shaped, "domino", "Ladder" and "imbricate faulted blocks" structural styles.4fault systems are divided in the plane,that are Beipu-Laoyemiao fault system,Gaoliu fault system,Baigezhuang fault system and Nanpu fault system.Among them,Gaoliu fault system and Nanpu fault system can be further divided into 2and 3sub-fault systems respectively.While,it can be divided into two fault systems vertically:lower fault system(E2s3 tectonic layer)and upper fault system(E2s1-Q layers).There are four kinds of fault assemblages: "parallel-like", "parallel intertwined" "comb-like" and "broom-like".Cenozoic structural deformation of Nanpu sag can be reasonably explained with two-phases extension model:structural deformation of E2s3 era is caused by NW—SE direction extension with Mesozoic pre-existing weaknesses,while structural deformation since E2s1 is caused by north-south direction extension with preexisting faults formed in E2s3 era,and E2s2 era is stress transition phase.There are significant segmentations in the sag boundary faults(Xinanzhuang Fault,Baigezhuang Fault and Gaoliu Fault),the strike,properties,activation of different segments showed a significant difference,and significant changes occurred in the different stages of the tectonic evolution.The tectonic framework by the sag boundary faults,Nanpu Fault and Gatou Fault in sag played an important controlling role on the fault formation and evolution of Nanpu sag.The complicated pre-existing faults were the root causes of lateral variation of fault system.
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