济阳坳陷第三纪侵入岩成藏研究

侵入岩是张性断陷盆地中较为发育的地质体。济阳坳陷第三纪辉绿岩油藏的发现表明在含油气盆地中,侵入岩能形成有经济价值的油气聚集。储层的形成是这类油藏形成的关键因素,裂缝系统的发育是条件之一,溶蚀孔隙的产生主要是烃源岩产生的有机酸形成的酸性溶液溶蚀硅酸盐类矿物的结果。侵入岩发育、有机酸产生、烃源岩压实排水和油气生成时间的匹配对侵入岩油藏的形成有决定作用,油气藏的形成还受岩体空间状态和岩体相带展布的控制。对这些因素的综合研究能够对侵入岩体的含油性做出较客观的评价。

Research on intrusion rock reservoir forming in Tertiary of Jiyang Depression

e intrusion rock is a kind of well-developed geological body in an extensional fault basin. The discovery of Tertiary diabase reservoir in Jiyang Depression shows that the intrusion rock could form oil-gas accumulation with economic value in petroleum basins. The formingof reservoir beds is the key factor in the forming of this type of oil reservoirs. The development of fracture system is one of the conditions; generation of dissolution pores is the result of acid solution formed from organic acid dissolving silicate minerals. The time matching between developments of intrusion rocks, the generation of organic acid, the compaction dewatering of source rock and oil-gas generation decides the formation of the intrusion rock reservoir. At the same time, the formation of the intrusion rock reservoir is also controlled by its space location and spread of its lithologic facies. The comprehensive studies on these factors could give an objective evaluation to the oil-bearing possibility of the intrusion rock reservoirs.