塔里木盆地塔中Ⅰ号构造带分段变形的运动学特征与成因探讨  

Kinematic characteristics and genesis analysis of segmental deformation in Tazhong No. 1 structural belt, Tarim Basin

作　　者：张仲培[1] 王璐瑶 邓尚 魏华动[3] 张继标[1] ZHANG Zhongpei;WANG Luyao;DENG Shang;WEI Huadong;ZHANG Jibiao(Petroleum Exploration and production research institute,SINOPEC,Beijing,100083;Changqing Oilfield Branch Company Ltd.,CNPC,Xi’an,Shannxi,710018;Northwest Oilfield Branch Company Ltd.,SINOPEC,Urumqi,Xinjiang,830011)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油长庆油田分公司,西安710018 [3]中国石化西北油田分公司,乌鲁木齐830011

出　　处：《地质论评》2020年第4期881-892,共12页Geological Review

基　　金：中国石化基础前瞻研究项目“塔里木盆地中央隆起构造解析与物理、数值模拟研究”(编号:P15089)的成果。

摘　　要：塔里木盆地塔中Ⅰ号构造带在构造样式、活动强度等方面表现出明显的分段性,但分段变形的运动学特征与成因仍不够明确,需要开展进一步研究。本文利用二维、三维地震资料,通过精细构造解析、运动学参数统计、活动期次厘定等手段,研究了塔中Ⅰ号构造带的几何学、运动学特征,分析其分段变形机制,并讨论了分段控制因素。研究表明:以中古15井与中古21井位置为界,塔中Ⅰ号构造带构造样式、运动学特征主要呈三段的特点,西段主要活动机制是断裂短距离滑动逆冲和地层旋转变形,同一层位的落差/垂直断距(H/h)值最大;中段为断裂沿走向滑动,H/h值约为1;东段为断裂长距离滑动逆冲和强烈褶皱,H/h值介于二者之间。活动机制的差异导致各段构造样式分别为基底卷入逆冲断裂控制的断层传播褶皱、走滑断裂发育的断控坡折、逆冲断裂强烈活动控制的断块褶皱,且活动强度呈现东段最大、西段次之、中段较小的特点。两大造山带分期活动是塔中Ⅰ号构造带分段变形的发育背景,基底结构与先存断裂是造成分段的主控因素,NE向走滑断裂调节塔中Ⅰ号构造带差异逆冲变形,并作为伴生断裂发育。Objectives: Tazhong No. 1 structural belt shows segmentation along strike which reflected directly by differentiation change in tectonic deformation patterns and activity intensity of it, but the kinematic characteristics and genesis of segmental deformation are still not clear, which need to be studied deeply.Methods: In this paper, based on the two-dimensional and three-dimensional seismic data, the geometric and kinematic characteristics of the Tazhong No. 1 structural belt are studied through fine structural analysis, statistics of kinematic parameters and determination of active stages. Besides that, the segmental deformation mechanism is analyzed and segmental controlling factors are also discussed.Results: Through fine structural analysis of 91 seismic profile, it shows that there are 7 kinds of deformation patterns of hanging-wall along Tazhong No. 1 structural belt striking. The width, vertical displacement and throw show 3-segment character along striking of Tazhong No. 1 structural belt with being largest in the east, followed by the west and the smallest in the middle, all the same.Conclusions: The tectonic deformation patterns and kinematic characteristics of Tazhong No. 1 structural belt can be divided into three segments with Well Zhonggu 15 and Well Zhonggu 21 being the boundary. The main active mechanism of the western section is the short-distance slipping thrust and the rotational deformation of the stratum. The ratio of throw and vertical displacement of the same horizon(H/h) is the largest;the main active mechanism of the middle section is the strike slipping, and the H/h ratio is about 1;the main active mechanism of the east section is the long-distance slipping thrust and intense fold, with the H/h ratio between the two. The difference of the activity mechanism leads to different structural styles of each section, which are fault-related fold controlled by the basement-involved thrust fault, the fault-controlled slope break whit the strike-slip fault developing, and the block fold controlle

关 键 词：塔里木盆地 塔中Ⅰ号构造带 几何学特征 运动学特征 分段变形 断裂特征 

分 类 号：P618.13[天文地球—矿床学]