摘要:针对塔里木盆地超深地震资料品质差、小位移走滑断层识别与解释难，结合地震剖面建模与地震平面属性识别，开展区域构造解释成图与构造解析。结果表明，塔里木克拉通内发育北东向与北西向走滑断层，并发育多种典型走滑构造，分布面积达5×104 km2，构成环满西大型统一走滑断层系统。环满西走滑断层系统具有分区、分级、分层、分类与分段的差异性，形成塔北、满西与塔中3个分区，4级规模断层；走滑断层主要以压扭为主分布在下古生界碳酸盐岩中，志留系—泥盆系、石炭—二叠系、中生界—古近系有张扭继承性活动；大型走滑断层沿走向具有分段性。综合分析，环满西走滑断层系统形成于中-晚加里东期，加里东末—早海西期、晚海西期和燕山—喜玛拉雅早期等有继承性活动；走滑断层演化具有继承性与改造性，连接生长是形成小位移、超长陆内走滑断层带的主要机制。本研究为复杂断裂构造研究提供了新思路。
关键词: 走滑断层/
识别/
构造解析/
几何学/
分布/
演化/
机制
Abstract:Due to the difficulty to identify small displacement strike-slip faults by low quality seismic data in the deep subsurface, fault mapping by seismic sections and horizontal seismic attributes is used to structural analysis of the strike-slip faults in the Tarim Basin. It is showed that there is a large circum-Manxi strike-slip fault system in the central Tarim, covered 5×104? km2? with NE and NW strike fault network. There are five type styles and eight kinds of typical strike-slip structures identified from seismic data. The strike-slip faults are divided into three areas of Tazhong, Manxi and Tabei from south to north, and divided into four classes according to the size of the fault. The strike-slip faults are mainly distributed in the Lower Paleozoic carbonates with dominated transcompressional faults, and inherited reactivations in Silurian-Devonian, Carboniferous-Permian and Mesozoic-Paleogene with transtensional faults. Large strike-slip faults are characterized by distinct segmentation. The strike-slip fault system formed in the Middle-Late Caledonian Period, and there were inherited reactivations in the End Caledonian-Early Hercynian Period, Late Hercynian Period and Yanshanian-Early Himalayan Period, following multiple inheritance and remodification. The linkage growth is the main mechanism for the formation of the small displacement and long length strike-slip fault zones. This study provides a new insight for the study of complicated structure in the sedimentary basin.
Key words:Strike-slip fault/
Identification/
Structure analysis/
Geometry/
Growth evolution/
Mechanism/
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