库车坳陷克拉苏构造带中段盐下逆掩推覆带特征与数值模拟
赵佳琦 , 程晓敢 , 陈维力 , 张鹏 , 潘杨勇 , 陈龙 , 肖文 , 范坤宇 , 魏疆宁
地球科学 ›› 2026, Vol. 51 ›› Issue (01) : 317 -328.
库车坳陷克拉苏构造带中段盐下逆掩推覆带特征与数值模拟
Characteristics and Numerical Simulation Analysis of Subsalt Overthrust Belts in Middle Kelasu Structural Belt, Kuqa Depression
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逆掩推覆带具有重要的油气勘探价值,为了搞清库车坳陷克拉苏构造带中段盐下逆掩推覆带特征和形成机制,通过对地震剖面的精细解释与离散元数值模拟,揭示克拉苏构造带中段盐下发育博孜25和克深5西两个逆掩推覆带,且其空间发育和古近纪盐湖分布、先存盐底辟构造之间存在耦合关系.膏盐岩厚度发生突变的分隔两个盐湖的凸起前端为应力集中区域,利于大规模逆掩构造的优先发育;盐底辟的持续发育为大规模逆掩推覆构造提供了变形空间.逆掩推覆构造下盘是今后克拉苏构造带发现或重新落实巴什基奇克组圈闭的重点区域.
Overthrust belt is of significant importance for hydrocarbon exploration. To elucidate the characteristics and formation mechanisms of the subsalt overthrust belts in the middle Kelasu structural belt, Kuqa Depression, it conducted detailed seismic profile interpretation combined with discrete element numerical modeling. The results reveal the development of two major subsalt overthrust belts, Bozi 25 and Keshen 5 West, in the middle Kelasu structural belt, and demonstrate that their spatial distribution is closely coupled with the Paleogene salt-lake distribution and pre-existing salt diapiric structures. The frontal uplift separating the two salt lakes, where abrupt variations in gypsum-salt layer thickness occur, acts as a stress concentration zone which facilitates the preferential propagation of large-scale overthrust structures. Moreover, the progressive growth of salt diapirs provides additional accommodation space for the development of these large-scale overthrust systems. These findings highlight the footwalls of overthrust structures as key targets for future hydrocarbon exploration and for identifying or re-evaluating Bashijiqike Formation traps within the Kelasu structural belt.
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国家自然科学基金联合基金项目(U22B6002)
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