论济阳坳陷新构造运动的成藏效应

济阳坳陷新构造运动的构造形迹主要表现为断裂和背斜构造,特别是复活性大断裂及其裂缝,在济阳坳陷油气成藏过程中起着关键性作用。经研究认为,新构造运动诱发和推动油气以断裂系统模式从烃源岩中排出,提高了烃源岩的排烃效率和排烃动力,影响油气运移取向,控制主要油气藏呈北东—南西向展布;输导或封挡油气,洼陷内小断裂和微裂缝等隐蔽输导体系可输导油气形成砂岩透镜体油气藏;控制油气幕式充注成藏;多种输导体系沟通新近系大型披覆背斜圈闭和丰富的烃源岩,形成了如孤岛、埕东等大中型油气田。笔者将新构造运动在油气成藏过程中所起的作用总称为成藏效应,其研究成果有助于重新认识盆地油气资源,并揭示油气成藏机理、成藏模式和成藏规律。

Oil Pool-Forming Effects of Neotectonic Movement in Jiyang Depression

Neotectonic movement in the Jiyang depression mainly formed faults and anticlines,especially, the large revived faults and its fractures.These structures play a important role in the processes of oil and gas accumulation.Neotectonic movement induces and drives oil and gas out from hydrocarbon source rocks in form of faults system,which improves efficiency and power of expulsion and influencs orientation of oil and gas migration and controls north-east extension of main pools;conducts and envelops oil and gas, small faults and microcracks conduct oil and gas,form pool of sandstone lens in sub-depression; Neotectonic movement controls hydrocarbon to cyclic accumulate;multi-conductive systems linked large upper Tertiary drape anticlines and prolific source rocks and formed large and medium size fields like Gudao and Chengdong and so on.In this paper,above-described effects derived from Neotectonic movement in the processes of reservoir-forming is called oil pool-forming effect whose study can reevaluate petroleum resources of basin,and reveal mechanism,pattern and law of oil pool-forming.