塔里木盆地中部跨构造单元走滑断裂的几何分段、运动学演化与形成机制——以FⅠ17断裂为例
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作者单位:

1.中国石油塔里木油田分公司;2.中国石油大学北京 油气资源与工程全国重点实验室

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P541

基金项目:

国家自然科学基金面上项目(42472186);中国石油天然气集团有限公司攻关性应用性科技专项“碳酸盐岩油气富集规律及有利区带研究”(2023ZZ16YJ01);中国石油塔里木油田公司研发中心科技项目“塔里木盆地超深层碳酸盐岩沉积体系与成储机理研究”(YF202503)


Geometric Segmentation, Kinematic Evolution, and Formation Mechanism of a Trans-tectonic-unit Strike-slip Fault in the Central Tarim Basin: A Case Study of the FⅠ17 Fault
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Affiliation:

1.PetroChina Tarim Oilfield Company;2.State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum

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    摘要:

    塔里木盆地中部FⅠ17断裂是一条典型的跨构造单元走滑断裂,横跨塔中隆起与阿满过渡带两大构造单元,其发育特征与成因机制仍不明确,制约了对盆地中部构造演化与油气分布规律的认识。基于高精度三维地震解释,结合区域构造分析,本文系统剖析了该断裂的几何学、运动学特征与演化过程。研究表明,FⅠ17断裂在平面上呈S型展布,依据走向变化可分为五段(Ⅰ段NE37°、Ⅱ段NE49°、Ⅲ段NE29°、Ⅳ段NE50°、Ⅴ段NE21°),各段构造样式差异显著:两端以直立走滑为主,中部发育叠接构造,呈现压扭性与张扭性交替特征。断裂活动强度在上奥陶统底面最大,向上寒武统底面递减,垂向继承性明显,整体呈现“中间强、两端弱”的空间分异特征。演化分析表明,该断裂主要经历了中晚寒武世雏形发育、中晚奥陶世成熟走滑、志留-石炭纪活化三个阶段。其形成受控于基底非均质性与周缘构造活动的耦合:基底裂陷的非线性排列导致断裂走向发生偏转,形成S型平面形态;塔中Ⅰ号断裂作为构造边界,通过吸收区域变形,限制了走滑断裂的横向延伸,造成跨单元断裂在塔中隆起与阿满过渡带之间的活动强度显著差异。本研究揭示了盆地中部跨构造单元大型走滑断裂的几何分段、演化过程与控制机制,深化了“基底控裂、边界限移”的构造模型认识,为塔里木盆地中部走滑断裂相关油气勘探与目标评价提供了重要的构造地质学依据。

    Abstract:

    The FⅠ17 fault in the central Tarim Basin is a typical trans-tectonic-unit strike-slip fault spanning the Tazhong Uplift and the Aman Transition Zone. Its developmental characteristics and genetic mechanisms remain unclear, constraining the understanding of the tectonic evolution and hydrocarbon distribution patterns in the central part of the basin. Based on high-resolution 3D seismic interpretation and regional structural analysis, this study systematically investigates the geometric and kinematic characteristics as well as the evolutionary process of the fault. The results show that the FⅠ17 fault exhibits an S-shaped planar distribution and can be divided into five segments based on variations in strike: Segment I (NE37°), Segment II (NE49°), Segment III (NE29°), Segment IV (NE50°), and Segment V (NE21°). The structural styles of these segments differ significantly: the two ends are dominated by vertical strike-slip, while the central part develops overlapping structures, showing alternating transpressive and transtensional characteristics. Fault activity is highest at the top of the Upper Ordovician and decreases toward the top of the Upper Cambrian, demonstrating clear vertical inheritance. Overall, the fault exhibits a spatial segmentation pattern of "strong in the middle and weak at the ends." Evolutionary analysis indicates that the fault underwent three main stages: embryonic development during the Middle-Late Cambrian, mature strike-slip activity during the Middle-Late Ordovician, and reactivation during the Silurian-Carboniferous. Its formation is controlled by the coupling of basement heterogeneity and peripheral tectonic activity: the nonlinear arrangement of basement rifts causes strike deflections, resulting in the S-shaped planar geometry. The Tazhong I fault, as a tectonic boundary, absorbs regional deformation and restricts the lateral propagation of strike-slip faults, leading to significant differences in activity intensity of the trans-unit fault between the Tazhong Uplift and the Aman Transition Zone. This study reveals the geometric segmentation, evolutionary process, and controlling mechanisms of large-scale trans-tectonic-unit strike-slip faults in the central Tarim Basin, deepening the understanding of the tectonic model of "basement-controlled fracturing and boundary-limited displacement." It provides important structural geological insights for hydrocarbon exploration and target evaluation related to strike-slip faults in the central Tarim Basin.

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宋兴国,陈石,孙崇浩,等. 塔里木盆地中部跨构造单元走滑断裂的几何分段、运动学演化与形成机制——以FⅠ17断裂为例[J]. 科学技术与工程, , ():

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  • 收稿日期:2025-11-28
  • 最后修改日期:2026-05-07
  • 录用日期:2026-05-09
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