塔里木盆地塔北地区深层走滑断裂分段性成因机制  

Segmentation Genesis Mechanism of Strike-Slip Fracture of Deep Carbonate Rocks in Tabei Area,Tarim Basin

作　　者：冯建伟 郭宏辉 汪如军[2] 昌伦杰[2] 王超[2] 高翔 Feng Jianwei;Guo Honghui;Wang Rujun;Chang Lunjie;Wang Chao;Gao Xiang(School of Geosciences,China University of Petroleum,Qingdao 266580,China;Tarim Oilfield,PetroChina,Korla 841000,China)

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266580 [2]中石油塔里木油田公司,新疆库尔勒841000

出　　处：《地球科学》2023年第7期2506-2519,共14页Earth Science

基　　金：中石油重大科技项目(No.ZD2019-183-006).

摘　　要：塔北地区深层走滑断裂带的分段性特征解析是研究断裂带控储控藏的关键问题,对推动深层油气勘探开发具有重要意义.从哈拉哈塘断裂带发育特征与地震资料解释成果相融合的角度出发,通过精细刻画哈15走滑断裂带结构及构造样式,讨论塔北哈拉哈塘地区哈15断裂带的分段性特征.在明确了塔北地区断裂带走滑运动特征和应力状态的基础上,以库伦-安德森纯剪模型和里德尔单剪模型为框架,根据断裂带局部应力状态,结合格里菲斯和库伦-莫尔等岩石破裂准则合理解释了深层走滑断裂次级R’剪破裂和T张破裂有序发育的成因机理.最终根据哈15断裂带的构造解析,建立了被动走滑构造环境下的汇聚型走滑断层及派生构造发育典型模型.区域挤压应力衰减以及三向应力状态的转变是走滑断裂分段性的主要原因,沿挤压应力方向可划分为压扭区、扭动区和张扭区,可细分为线性紧闭断层组合带、直线型辫状构造带、对称羽状断层带、伸展/挤压叠覆带或斜向拉分地块以及马尾状断层组合带等.The segmental characteristics of the deep strike-slip fault zone in the Tarim Basin are the key issues in the study of fault zone reservoir control,which is of great significance for promoting deep oil and gas exploration and development.From the perspective of the integration of the development characteristics of the Harahatang fault zone and the results of seismic data interpretation,in this study it discusses the segmentation characteristics of the Ha-15 fault zone in the Harahatang area of Tabei by carefully characterizing the structure and structural style of the Harahatang fault zone.On the basis of clarification of characteristics and stress state of the strike-slip motion of the fault zone in the north of the tower,the causal mechanism of the orderly development of secondary R'shear fracture and T-tensile fracture of deep strike-slip fracture is reasonably explained by taking the Coulomb-Anderson pure shear model and the Riddle single shear model as the framework,and combining the rock fracture criteria of Griffith and Coulomb-Moir.Finally,according to the structural analysis of the Harb-15 fault zone,a typical model of convergent strike-slip fault and derived tectonic development in the passive strike-slip tectonic environment is established.It is believed that the attenuation of regional extrusion stress and the change of three-way stress state are the main reasons for the segmentation of strike-slip fractures,which can be divided into compression torsion zone,torsion zone and tensile torsion zone along the direction of extrusion stress,and can be subdivided into linear tight closure fault combination zone,linear braided structural zone,symmetrical plume fault zone,stretch/extrusion laminate zone or oblique tensile division plot and horsetail fault combination zone.

关 键 词：塔北地区 走滑断裂分段性 应力衰减 岩石破裂准则 地质力学. 

分 类 号：P551[天文地球—构造地质学]