济阳坳陷埕岛地区下古生界潜山断裂特征及控藏作用

下古生界做为埕岛地区主要含油层系之一,经历了一轮勘探高潮之后陷入沉寂。在对埕岛地区下古生界潜山的断裂进行系统分析的基础上,通过对已钻井的解剖,综合断层的活动性质和力学性质,分析断层封堵性的差异,探讨断层的封堵机理,提出古断层和具有压扭性的断层具有较好的封堵性的认识,对埕岛潜山的封堵模式进行修正,指出潜山斜坡和负向构造是下一步有利的勘探方向,在勘探实践中得到了进一步的证实,为潜山勘探提供了理论依据。

Fault characteristics and their controls on hydrocarbon accumulation of Lower Paleozoic buried hills in Chengdao area, Jiyang Depression

As one of the main oil-bearing strata in Chengdao area, the Lower Paleozoic has experienced a round of exploration climax and fallen into silence. On the basis of systematic analysis of the faults in the Lower Paleozoic buried hills in Chengdao area, this paper analyses the differences of fault sealing ability through the analysis of drilled wells, the active and mechanical properties of faults, explores the sealing mechanism of faults, innovatively puts forward the knowledge that the ancient faults and compressive-torsional faults have better sealing ability, and puts forward the sealing mode of Chengdao buried hills. It is pointed out that the slope and negative structure of the buried hill are the favorable exploration direction for the next step. This knowledge has been further proved in exploration practice, which has realized a new breakthrough in buried hill exploration, enhanced the confidence of buried hill exploration and opened up the prospecting situation.