黄骅坳陷孔南地区孔店组油气成藏主控因素及成藏模式

通过对孔店组构造、沉积及烃源岩演化特征进行综合研究,总结了孔店组油气成藏主控因素,并结合油气勘探实践,建立了孔店组油气成藏模式.研究认为,孔二段有效烃源岩控制了油气藏平面分布范围,区域主干断裂控制了油气富集区带,区域盖层控制了油气纵向分布,特别是地层岩性油气藏的分布.孔南地区孔店组油气具有2种成藏模式：一种是构造型复式油气成藏模式,即在构造高点断裂发育带形成逆牵引背斜、断鼻或断块油气藏;另一种为地层岩性型油气成藏模式,通常在斜坡区形成砂岩透镜体、砂岩上倾尖灭油气藏,或在构造高点形成断块-岩性油气藏.随着勘探工作的不断深入,总结油气成藏规律,特别是隐蔽油气藏形成与富集条件,对于油田储量及产量增长都具有重要意义.

Main controlling factor and model of Kongdian Formation hydrocarbon accumulation in Kongnan Area of Huanghua Depression

Through studying the characteristics of sedimentation, structure and source rock evolution of Kongdian Formation, this paper summarized the main controlling factors of hydrocarbon accumulation. The hydrocarbon accumulation models were established combining with the exploration practice. The study shows that the effective hydrocarbon source rocks control the plane distribution of oil and gas reservoir, the main faults control the enrichment zone oil and gas, and the regional cap rocks control the longitudinal direction of oil and gas. especially for stratigraphic and lithologic oil and gas reservoirs. In Kongnan Area, there are lwo types of hydrocarbon accumulation models： one is the tectonic, compund hydrocarbon accumulation model, that is the reverse drag anticline, fault nose and fault block reservoirs in fracture developed zone of the crest of structure; another is the stratigraphic and lithologic subtle hydrocarbon accumulation model, that is the sand lens, up dip sandstone pinch out reservoirs in slope area and the fault-lithologie oil and gas reservoirs in fracture zone. With the deepening of exploration, the summary on the accumulation law of oil and gas, especially for the subtle reservoir formation and enrichment conditions, is of great signifieance to improve oil reserves and production.