Characteristics of faults on reservoirs of pre Mesozoic buried hill in northern Tarim basin——by taking the east of Sandaoqiao area as an example
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摘要: 以三道桥东地区新三维资料为基础，对沙雅隆起北部前中生界潜山断裂进行分析，并结合区域构造背景分析了断裂形成期次，同时对不同性质断裂油气地质意义进行研究。结果表明，沙雅隆起北部前中生界潜山发育逆断层、正断层和走滑断层，平面上存在北北东向、北西向及近东西向三组走向。轮台断裂以南的走滑断层形成于加里东中晚期，平面上呈北北东向；轮台断裂以北走滑断裂受到海西期逆断层改造，剖面上具有“视逆实正”的特点，平面上呈北东向。北北东向逆断层形成于加里东运动晚期–海西运动早期，定型于海西运动晚期；北西向正断层与海西晚期二叠系火山活动有关；近东西向断裂逆冲断层形成于海西运动末期–印支运动期。不同性质、不同期次的断裂对于潜山圈闭的形成具有建设意义，逆断层控制断裂构造带的形成，形成了背斜、断背斜、断块等构造圈闭。与火山岩有关的张性断层、走滑断层能有效改善碳酸盐岩的储集条件。Abstract: Based on the new 3D data of the east of Sandaoqiao area, the fault characteristics of pre Mesozoic buried hill in the north of Shaya uplift was analyzed. Combined with the regional tectonic background, the formation stages of faults were analyzed, and meantime the petroleum geological significance of different faults was studied. The results show that reverse faults, normal faults and strike slip faults were developed in the pre Mesozoic buried hill of northern Shaya uplift, and there were three groups of strike in plane, namely NNE, NW and EW. The strike slip fault to the south of Luntai fault was formed in the middle and late Caledonian period. The strike slip fault to the north of Luntai fault was reformed by Hercynian reverse fault. It has the characteristics of "apparent reverse and real positive" on the profile, and presents NE direction on the plane. The NNE trending reverse faults were formed in the late Caledonian and early Hercynian movements, and were shaped in the late Hercynian movement. The NW trending normal fault is related to the Permian volcanic activity in the late Hercynian. The nearly EW trending thrust fault was formed in the late Hercynian movement and Indosinian movement. The faults with different properties and stages have constructive significance for the formation of buried hill traps. The reverse fault controls the formation of fault structural belt, forming anticline, fault anticline, fault block and other structural traps. The extensional faults and strike slip faults related to volcanic rocks can effectively improve the reservoir conditions of carbonate rocks.
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Key words:
- Tarim basin /
- the east of Sandaoqiao /
- fault characteristics /
- structural trap /
- carbonate reservoirs /
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