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长垣主断层(长垣断层) 是东濮凹陷西部斜坡带的二级同沉积断层,断层封闭性对油气运聚具有重要作用。利用断层生长指数、断面正压力、断层泥比率和断层两侧岩性对置关系分析了长垣断层的封闭性,结果表明:长垣断层由南向北活动时期逐渐变晚,活动强度南强北弱,断层的断距和垂向封闭性差异是油气差异性富集的主控因素;沙二段上亚段厚层泥岩的涂抹作用使长垣断层侧向封闭性增强;长垣断层下降盘沙二段上亚段与上升盘对置地层的南北向差异导致上升盘油气富集层位的差异;长垣断层上升盘的伴生断层为构造断层,活动时期较早,垂向封闭性强,油气侧向运移至长垣断层后,其聚集受断层两侧岩性对置关系控制。
The Changyuan fault (Changyuan fault) is a second-level synsedimentary fault in western slope zone of Dongpu depression. Fault sealing plays an important role in hydrocarbon migration and accumulation. The sealing of the Changyuan Fault is analyzed by using the relationship between fault growth index, normal pressure in section, mud ratio of mud and the lithology of both sides of the fault. The results show that the fault of Changyuan fault gradually becomes late from south to north and the intensity of activity is strong The weakening of north and weak faults and the vertical sealing difference are the main controlling factors for the differential enrichment of oil and gas. The smearing of the thick mudstones in the Upper Member of the second member of Shahejie Formation enhanced the lateral sealing of the Changyuan fault, The difference between the north and south directions of the upper part of the second plateau and that of the ascending plate leads to the difference of oil and gas rich reservoirs in the ascent plate. The associated faults of the Changyuan fault rising plate are tectonic faults with earlier active periods and stronger vertical sealing After the lateral migration of oil and gas to the Changyuan fault, its accumulation is controlled by the lithology relations on both sides of the fault.