摘要
沙垒田凸起区至少发育6组北东向的走滑断层，西段的走滑作用明显强于东段。构造演化研究成果表明，该区北东向断层至少经历了2期走滑。晚侏罗世时期，强烈左旋走滑，将沙垒田凸起分割东西两段，控制整体构造格局。新近纪，北东向断层在右旋走滑的作用下，改造盖层披覆构造。西段可以明显见到北东向主走滑断层，分支断层和伴生断层依附于走滑断层发育，整体呈负花状构造或“Y”字型结构。而在东段，主走滑断层不明显，分支断层和伴生断层不发育，但仍整体表现为负花状构造，晚期断层往深处都逐渐收敛到主走滑断层上，断层两盘的地层厚度相当，断距不明显。构造脊是油气长期汇聚的有利区带，受走滑作用强度的控制和构造圈闭发育特征的影响，东、西段油气主要的运聚模式存在一定的差异。在东段，走滑作用相对较弱，圈闭在走滑断层之间发育，为披覆背斜型圈闭，主要发育“构造脊—断层—砂体”油气运移模式。在西段，走滑作用强，圈闭依附于走滑断层发育，主要为断块或断鼻圈闭，发育“沟谷充填砂—走滑断裂系”油气运移模式为主。
Abstract
There are at least 6 north-east strike-slip faults in Shaleitian Sailent and the strike?-slip effect in the west segment is stronger than that in the east segment. The tectonic evolution research results show that the north-east trending faults underwent at least two periods of strike-slip motion in the area. During Late Jurassic period, the strong sinistral strike-slip divided Shaleitian Sailent into two segments and controled the overall tectonic framework. During Neogene period, under the action of dextral strike-slip, the NE trending faults transformed the capping formation. In the west segment, we can see the main NE trending strike-slip faults obviously, branch faults and associated faults are developed near strike-slip faults, which presents negative flower structure or "Y" structure as a whole. While in the east segment, the main strike-slip faults are not obvious, there are not branch faults and associated faults developed. But negative flower structure are still shown, in the late stage, the faults were gradually converging to the main strike-slip faults in the deep, and the strata thicknesses in both walls of the fault are equal, which shows no obvious slip. Structure ridge is the favorable zone for oil and gas accumulation for a long time, but controlled by strike-slip motion and affected by the structural trap development characteristics, the main hydrocarbon migration and accumulation modes in the east are different from that in the west. In the eastern part, the strike slipping is relatively weak and traps developed between strike?-slip faults, the trap type is drape anticline trap, major hydrocarbon migration type is "structural ridge-fault-sand body" mode. In the western part, the strike slipping is relatively strong, traps developed with strike-slip faults and their types are mainly fault-block traps or fault-nose traps, the major hydrocarbon lateral migration type is "gully filling sand-strike slip fault system" mode.
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