昆北断阶带断裂形成机制构造模拟实验  

Tectonic Simulation Experiment of Fault Forming Mechanism in Kunbei Fault Terrace Belt

作　　者：王海琦 窦小雨 王林 WANG Haiqi;DOU Xiaoyu;WANG Lin(Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Lanzhou,Gansu 730000,China;Gansu Management Center of Geological Exploration Fund,Lanzhou,Gansu 730000,China;Supervision Company,Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China)

机构地区：[1]甘肃省地质矿产勘查开发局,兰州730000 [2]甘肃省地质勘查基金管理中心,兰州730000 [3]中国石油新疆油田分公司监理公司,新疆克拉玛依834000

出　　处：《新疆石油地质》2018年第3期361-366,共6页Xinjiang Petroleum Geology

基　　金：国家油气重大专项(2011ZX05003)

摘　　要：昆北断阶带构造形成与发展受多种条件的限制,应力作用机制各有不同,格局较为复杂。针对一、二级主控断裂和三级及次级断裂分别设计了2组构造模拟实验。第一组通过对一、二级主控断裂构造模拟,揭示了在喜马拉雅运动期南北向构造动力持续挤压作用下,昆北断阶带发育一系列不均衡的前展式逆冲断裂体系;与研究区5条地震解释剖面吻合度较高。第二组通过对三级及次级断裂构造模拟,表明平面上三级及次级断裂由最大剪切应力控制,主要发育共轭型和撕裂型2种逆断裂体系,与研究区时间切片上的断裂系统特征吻合。数值模拟分析结果进一步证实了2组实验的结论,并表明,次级断裂系统改善了储集层的储集性能。昆北油田切16井区、切6井区、切12井区和切4井区均证实为油气富集区,实验结论与之对应较好,对油气勘探有指导和借鉴意义。Various conditions and stress mechanisms result in the complicated tectonic settings of the Kunbei fault terrace belt. 2 series oftectonic simulation experiments are designed for the primary-order and second-order main faults, and the third-order and other secondaryorder faults, respectively. The first series of experiments simulate the primary-order and second-order main faults and the results reveal thata series of unbalanced thrust fault systems are developed on the Kunbei fault terrace belt under the continuous compression of N-S trendingtectonic dynamics during Himalaya orogeny, which highly matches with the 5 seismic interpretation sections in the study area. The secondseries of experiments simulate the third-order and other secondary order fault structures and suggest that these faults are controlled by themaximum shear stress, in which 2 fault systems including conjugate reverse fault and tearing reverse fault are developed, which matcheswith the characteristics of fault systems displayed on the time slices in the study area. The numerical simulation results can further verifythe conclusions of the 2 series of experiments and show that the secondary fault systems can improve the accumulation properties of reser-voirs. Wellblocks of Qie-16, Qie-6, Qie-12 and Qie-4 in Kunbei oilfield have been proved to be the hydrocarbon enrichment areas, whichwell matches with the experiment results and can be the guidance and references for oil and gas exploration.

关 键 词：昆北断阶带 断裂特征 形成机制 构造模拟实验 最大剪切应力 油气富集 

分 类 号：P551[天文地球—构造地质学] TE121.2[天文地球—地质学]