塔里木盆地顺南—古隆地区断裂发育特征及成因机制

doi:10.3969/j.issn.1006-6535.2025.03.002

摘要/Abstract

摘要： 针对顺南—古隆地区断裂系统的性质、演化期次及成因机制存在认识分歧的问题,通过地震解释、地震属性提取、断层活动强度统计、区域构造背景等分析,对研究区断裂系统开展研究。结果表明:该区北东东向断裂为加里东早期被动大陆边缘阶段发育的伸展正断层,动力来源于阿尔金洋裂开过程产生的北西—南东向伸展作用,该组断裂在加里东中期复活形成“P”破裂;北东向断裂为加里东中期压扭阶段形成的广布式左行走滑断层,应力来源于阿尔金洋在关闭过程中产生的北西—南东向挤压作用;北北西向断裂为加里东晚期—海西中期基底走滑形成的张性破裂,应力来源于南天山洋闭合过程产生的近南北向挤压作用;车尔臣断裂走向分段活动差异是导致塔中Ⅰ号断裂分段活动并控制北东向压扭性走滑断裂广布式发育的主要原因。走滑断裂带的构造特征对储层规模、油气运移具有重要意义。该研究成果可为深入分析顺南—古隆地区走滑断裂发育过程及油气成藏关系分析提供理论依据,为研究区及周边油气勘探奠定基础。

关键词: 塔里木盆地, 顺南—古隆地区, 走滑断层, 伸展断层, 成因机制

Abstract: To address the issue of differing understandings regarding the nature, evolutionary stages, and genetic mechanisms of the fault system in the Shunnan-Gulong Area, a study was conducted on the fault system in the study area through seismic interpretation, seismic attribute extraction, fault activity intensity statistics, and analysis of the regional tectonic background. The results show that the north-east-east-trending faults are extensional normal faults formed during the early Caledonian passive continental margin stage, driven by north-west to south-east oriented extension from the opening of the Altyn Ocean. These faults were reactivated in the middle Caledonian period to form "P" fractures. The north-east-trending faults are widespread left-lateral strike-slip faults formed during the middle Caledonian compressional-transpressional stage, with stress originating from the north-west to south-east oriented compression generated during the closure of the Altyn Ocean. The north-north-west-trending faults are tensile fractures formed during the late Caledonian to middle Hercynian period due to basement strike-slip, with stress from the nearly south-north compression caused by the closure of the southern Tianshan Ocean. The segmented activity differences in the Cheltenham Fault are the main reason for the segmented activity of the Tazhong No. 1 Fault and the widespread development of north-east-trending compressional-transpressional strike-slip faults. The structural characteristics of strike-slip fault zones are crucial for reservoir size and hydrocarbon migration. This study provides a theoretical basis for analyzing the development process of strike-slip faults and their relationship with hydrocarbon accumulation in the Shunnan-Gulong Area, and laying a foundation for hydrocarbon exploration in the study area and its surroundings.

Key words: Tarim Basin, Shunnan-Gulong Area, strike-slip fault, extensional fault, genetic mechanism

中图分类号:

TE121

黄诚, 林波, 张胜, 王岳丰, 于福生. 塔里木盆地顺南—古隆地区断裂发育特征及成因机制[J]. 特种油气藏, 2025, 32(3): 8-15.

HUANG Cheng, LIN Bo, ZHANG Sheng, WANG Yuefeng, YU Fusheng. Development characteristics and genetic mechanism of faults in the Shunnan-Gulong Area, Tarim Basin[J]. Special Oil & Gas Reservoirs, 2025, 32(3): 8-15.

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