塔中北坡顺南地区走滑断裂样式、变形机理及石油地质意义  

The Characteristics,Formation and Petroleum Geology Significance of the Strike-slip Fault System in Shunnan Area,Northern Slope of Tazhong Uplift

作　　者：甄素静 汤良杰[1,2] 李宗杰[3] 李萌[1,2,4] 曹自成[3] 杨素举[3] 

机构地区：[1]油气资源与探测国家重点实验室,北京102249 [2]中国石油大学地球科学学院,北京102249 [3]中国石化西北油田分公司,新疆乌鲁木齐830000 [4]中国冶金地质总局矿产资源研究院,北京101300

出　　处：《天然气地球科学》2015年第12期2315-2324,共10页Natural Gas Geoscience

基　　金：国家重点基础研究发展计划("973")项目(编号:2012CB214804;2005CB422107);国家自然科学基金项目(编号:41172125;40972090);国家科技重大专项(编号:2011ZX05002-003-001;2011ZX05029-002;2011ZX05002-006-007HZ);中国石油化工股份有限公司项目(编号:P11086);中国石化西北油田分公司项目(编号:KY2012-S-051)联合资助

摘　　要：塔中北坡顺南地区奥陶系储层具有良好的油气勘探前景。结合三维地震精细解释、属性提取等方法,从剖面形态和平面展布特征探讨了走滑断裂的变形样式、形成机理及其石油地质意义,拟为该区地质构造建模和油气勘探提供新的思路。研究表明,顺南地区主要发育NE向、NEE向、NW向3组走滑断裂,其中NE向、NEE向为2组左行走滑断裂,NW向为规模较小的右行走滑断裂;变形样式上,NE向断裂以典型的"花状"构造为主;NEE向和NW向断裂则较为简单,多为单条陡立的隐伏断层。加里东中期Ⅲ幕,塔中Ⅰ号断裂在由南向北挤压作用下强烈逆冲;在其构造变形分段处,产生与塔中Ⅰ号断裂垂直的走滑分量,在顺南地区则分别发育了2组NE向和NEE向的走滑断裂。在上述2条左行走滑断裂的制约下,夹持在断裂间的地块发生逆时针旋转,导致地块内部发育NW向的右行剪切变形。该区走滑断裂对热液岩溶的控制作用主要表现在沿NE向和NEE向走滑断裂的线状岩溶作用,以及NW向断裂参与下的面状岩溶作用;同时也是油气垂向运移的通道。The Ordovician reservoir of the Shunnan area showed a good oil and gas exploration potential. Based on the 3D seismic interpretation and attribute extraction technique, the structural characteristics, formation mechanism and petroleum geology significance were discussed in the profile as well as the section, providing a new idea for the geological structure modeling and oil and gas exploration. Studies show that there are three different trending strike-slip faults. The NE- and NEE-striking faults show sinistral strikeslip,while the smaller-scale,NW-striking faults were characterized by dextral strike slip. The NE-strikingfault formed a typical flower structure, while the NEE and NW are relatively simple, manifested as single and vertical fault. In the III screen of middle Caledonian, Tazhong No. 1 Structural Zone thrust fault was formed by a nearly N-S-striking compression. In its tectonic deformation divisions, there occurred strikeslip component perpendicular to Tazhong No. 1 Structural Zone, and developed NE- and NEE-trending strike-slip faults in Shunnan area. The blocks restricted by the two sets of sinistral strike-slip faults have a counterclockwise trend,resulting in NW-striking dextral shear deformation in the internal blocks. The con- trolling of strike-slip faults on hydrothermal karst mainly manifested in linear karstification along the NE- and NEE-trending strike-slip fault, and planar karstification involved in the NW strike-slip faults. The strike-slip fault is also taken as the path of vertical oil and gas migration.

关 键 词：顺南地区 走滑断裂 断裂特征 形成机理 石油地质意义 

分 类 号：TE377[石油与天然气工程—油气田开发工程]