塔里木盆地顺北5号走滑断裂中段活动特征及其地质意义

doi:10.11743/ogg20190504

摘要/Abstract

摘要： 塔里木盆地顺北5号走滑断裂（简称顺北5断裂）是一条贯穿塔北隆起、顺托果勒低隆以及塔中隆起的断裂带，可识别长度长达270 km，是目前顺北及邻区已知最长的克拉通内走滑断裂带。基于顺北5号断裂走向总体变化特征，可将其分为三段：北段（走向约NW20°）、中段（走向为近南北向-NE10°）和南段（走向约NE20°）。顺北5号断裂中段（NE10°部分）主活动阶段为加里东中期Ⅲ幕与加里东晚期，形成的深层压脊构造与中层地堑构造分别指示斜压（压扭）应力环境与伸展应力环境。顺北5号断裂中段浅层雁列正断层控制了志留系碎屑岩（砂岩段、泥岩段）裂缝-洞穴型储集空间的发育，雁列正断层破碎带在断层上、下盘发育具有不对称性。顺北5号断裂带北段与中段滑移距分布具有“两头大，中间小”的特征，同时北段与中段也具有显著不同的几何学与运动学特征，说明在构造演化初期形成于不同体系的断层在后期逐段拼接，形成了顺北5号断裂现今贯穿塔北隆起、顺托果勒低隆以及塔中隆起的展布格局。

关键词: 地堑, 志留系碎屑岩, 滑移距, 走滑断裂, 顺北及邻区, 塔里木盆地

Abstract: The Shunbei 5 fault zone is known so far as the longest intracratonic strike-slip fault zone in Shunbei area and its surroundings,Tarim Basin.With a length of 270 km identified by both 2D and 3D seismic data,the Shunbei 5 fault zone is characterized by a long fault trace running through the Tabei uplift,Shuntuoguole low uplift and Tazhong uplift.Based on the overall change of fault strike,the Shunbei 5 fault zone can be divided into three segments:the northern segment (trending approximately NW20°),the central segment (trending nearly NS,i.e.NE10°) and the southern segment (trending approximately NE20°).The main faulting of the central segment (the part trending NE10°) of the Shunbei5 fault zone occurred in the 3rd episode of the middle stage of the Caledonian and the Late Caledonian,when the deep ridge-like structures and medium-deep grabens were formed under transpressional and extensional stress regimes,respectively.The shallow en echelon normal faults in the central segment of Shunbei 5 fault zone controlled the formation of reservoir space of fracture-cavity type in the Silurian clastic strata (namely sandstone and mudstone intervals).The fractured zones were developed in an asymmetric pattern in the hanging wall and footwall of the en echelon normal faults.The measured displacements of the northern and central segments of the Shunbei 5 fault zone are characterized by "longer at both ends and shorter in the center".Furthermore,the northern and central segments also remarkably differ in both geometries and kinematics,suggesting that Shunbei 5 fault zone was formed through the linking of various faults developed in different fault systems in early tectonic evolution.

Key words: graben, Silurian clastic rock, displacement, strike-slip fault, Shunbei area and its surroundings, Tarim Basin

中图分类号:

TE121.2

邓尚,李慧莉,韩俊,等. 塔里木盆地顺北5号走滑断裂中段活动特征及其地质意义[J]. 石油与天然气地质, 2019, 40(5): 990-998,1073. doi: 10.11743/ogg20190504 Deng Shang,Li Huili,Han Jun,et al. Characteristics of the central segment of Shunbei 5 strike-slip fault zone in Tarim Basin and its geological significance[J]. Oil & Gas Geology, 2019, 40(5): 990-998,1073. doi: 10.11743/ogg20190504

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