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| 北部湾盆地迈陈凹陷东部断裂系统成因演化机制的构造物理模拟 |
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李伟1,刘超1,张江涛2,段佳佳3,陈伟4,陈兴鹏1,李春锐1
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(1.中国石油大学地球科学与技术学院,山东青岛 266580;2.中海石油(中国)有限公司天津分公司,天津 300452;3.中联煤层气有限责任公司,山西太原 030000;4.中国石化江苏油田地质科学研究院,江苏扬州 225012)
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| 摘要: |
| 受多期次构造应力场叠加转变的影响,迈陈凹陷东部断裂发育具有明显的阶段性,平面上断裂走向在古新统和始新统以NE向为主,渐新统转变为EW和NEE向,剖面上以T4反射层(涠州组底)为界可以划分为上下两套断裂系统,上下两套断裂系统继承与改造并存。针对这一问题,在地震、钻井岩心和区域地质背景资料分析解释的基础上,对迈陈凹陷东部断裂系统的发育演化进行构造物理模拟实验正演分析。实验结果表明:迈陈凹陷东部在古新世—中始新世主要受控于NW向伸展应力场,以NE向断裂发育为主;晚始新世在NW向拉张的同时叠加了右旋剪切作用,近EW向断裂开始发育,部分早期发育的NE向断裂继承性活动。 |
| 关键词: 构造物理模拟 断裂发育演化 构造应力场 古近纪 迈陈凹陷东部 |
| DOI：10.3969/j.issn.1673-5005.2015.03.005 |
| 分类号::P 548 |
| 基金项目:中央高校基本科研业务费专项(27R1101053A);教育部高等学校博士学科点新教师基金项目(K0901045A);国家油气重大专项课题(2011ZX05023-006-05) |
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| Structure physical modeling experiment of evolutionary mechanism about fault system in eastern area of Maichen sag, Beibu-gulf Basin |
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LI Wei1, LIU Chao1, ZHANG Jiangtao1, DUAN Jiajia1, CHEN Wei2, CHEN Xingpeng1, LI Chunrui1
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(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.China National Offshore Oil Corporation Limited-Tianjin, Tianjin 300452, China;3.China United Coalbed Methane Corporation Limited, Taiyuan 030000, China;4.Geological Research Institute of Jiangsu Oilfield, SINOPEC, Yangzhou 225012, China)
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| Abstract: |
| Influenced by the superimposition and transformation of multiple phrases of tectonic stress field, the development of the eastern fault system displays apparent periodicity in Maichen sag. On the plane view, the fault strike was mainly NE trending in Paleocene and Eocene, and changed to EW and NEE in Oligocene. On the seismic section, taking T4 reflecting surface (the bottom boundary of Weizhou Formation) as a boundary, the fault system can be divided into the upper system and the lower system, between which inheritance and transformation coexist. Aiming at this problem, based on the analysis of seismic data, drilling cores, and regional geological background, structure physical simulations were performed to model the eastern fault system 's evolution in Maichen sag. The results show that the eastern area of Maichen sag was mainly controlled by the NW tensional stress from Paleocene to Middle Eocene, and the fault strike was mainly NE trending. In the late Eocene, dextral shearing was superimposed on the NW tensional stress, which contributed to the development of the EW-trending faults,and some of those early developed NW-trending faults act successively. |
| Key words: structure physical simulation fault evolution tectonic stress field Paleogene the eastern area of Maichen sag |
