西昆仑山前皮牙曼构造中新世以来变形特征及含油气性分析
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摘要
断层转折褶皱或断弯背斜形成于逆掩断层转折处,是许多压性变形区域中的主要机制。本文运用断层相关褶皱理论、前展式逆冲系统、构造三角楔、赤平投影解析及平衡地质剖面技术建模等地质学观点与方法,通过野外跨越盆山地质构造剖面的测制,结合地震剖面的构造解释,对西昆仑山前带皮牙曼构造进行了精细的几何学与运动学解析,认为该构造带位于和田逆冲推覆构造南北分带的锋带,垂向变异性表现为呈三层结构:浅构造层大型外来系统断弯背斜、中构造层准原地系统的古生界双重构造以及深构造层原地系统的弱变形带或叠瓦状;对皮牙曼构造的几条典型的地震剖面中的生长构造进行了详细分析,确定出该区域的主要构造变形模式、变形机制及构造定型时间。对其形成的动力背景进行分析,利用平衡地质剖面技术模拟其形成演化过程,对皮牙曼构造叠加断坡背斜型双重构造中新世以来的推覆距离,也即剖面地层的缩短距离及纵向增厚距离进行了估算,并根据估算结果分析了其对西昆仑造山带隆升的地质指示意义。
在深入分析皮牙曼构造垂向变异特点的基础上,探讨了造山带内部常见构造样式双重逆掩构造对油气勘探的意义;探讨了皮牙曼构造生、储、盖层及其组合特征,有效分析其主要圈闭类型,提供了该区块油气勘探潜力的认识。
Fault-bend fold or fault-bending anticline forms at the juncture of overthrust, which is the the main mechanism in many compressional deformation area. Through geological structure profile across mountain and basin in field, with structural explanation of seismic profiles, this paper uses the newest concepts and methods, such as fault-related fold theories about fault fold, piggyback thrust system, structural triangular zone, stereographic projection and balanced geological sections technique modeling, to parse subtly Piyaman struture in the piedmont of West Kunlun mountain in Geometry and Kinematics. It believes that this structural belt lies in the frontal zone of Hetian nappe, and its vertical variability shows three layer construction: big scale allochthonous systemic fault-bending anticline in shallow structural layers, para in-situ systemic Palaeozoic duplex structure in the middle structural layers and in-situ systemic weak deformation zone or imbricate in deep structural layers. The paper also detailedly analyze the growth structure in Piyaman structure by several classical seismic profiles and make sure deformation tectonic pattern in this region, deformation mechanism and the time of tectonic stereotype. Using balanced geological section technique to imitate its formation and evolution progresses, we estimate the napped distance of Piyaman structure since Miocene epoch, i.e. shortening distance of profile and longitudinal thickening distance, based on the estimation results, we analyze the geological significance of indicator to the uplift of the West Kunlun Mountain orogenic belt.
Based on the deep analysis of vertical variability's characteristics of Piyaman struture, this paper discusses the significance to oil-gas exploration for double thrustal structure and studies on oil source, reservoir, cap rock and their assemblage, its critical trap types and potential for oil and gas exploration.
在深入分析皮牙曼构造垂向变异特点的基础上,探讨了造山带内部常见构造样式双重逆掩构造对油气勘探的意义;探讨了皮牙曼构造生、储、盖层及其组合特征,有效分析其主要圈闭类型,提供了该区块油气勘探潜力的认识。
Fault-bend fold or fault-bending anticline forms at the juncture of overthrust, which is the the main mechanism in many compressional deformation area. Through geological structure profile across mountain and basin in field, with structural explanation of seismic profiles, this paper uses the newest concepts and methods, such as fault-related fold theories about fault fold, piggyback thrust system, structural triangular zone, stereographic projection and balanced geological sections technique modeling, to parse subtly Piyaman struture in the piedmont of West Kunlun mountain in Geometry and Kinematics. It believes that this structural belt lies in the frontal zone of Hetian nappe, and its vertical variability shows three layer construction: big scale allochthonous systemic fault-bending anticline in shallow structural layers, para in-situ systemic Palaeozoic duplex structure in the middle structural layers and in-situ systemic weak deformation zone or imbricate in deep structural layers. The paper also detailedly analyze the growth structure in Piyaman structure by several classical seismic profiles and make sure deformation tectonic pattern in this region, deformation mechanism and the time of tectonic stereotype. Using balanced geological section technique to imitate its formation and evolution progresses, we estimate the napped distance of Piyaman structure since Miocene epoch, i.e. shortening distance of profile and longitudinal thickening distance, based on the estimation results, we analyze the geological significance of indicator to the uplift of the West Kunlun Mountain orogenic belt.
Based on the deep analysis of vertical variability's characteristics of Piyaman struture, this paper discusses the significance to oil-gas exploration for double thrustal structure and studies on oil source, reservoir, cap rock and their assemblage, its critical trap types and potential for oil and gas exploration.
引文
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