辽河坳陷大民屯凹陷静北潜山基岩储集层研究

静北潜山基岩地层发育一套中元古界滨海-浅海环境下沉积的砂泥岩和碳酸盐岩，先后经历了白云岩成岩作用阶段、风化溶蚀-胶结作用阶段和浅变质作用阶段，但对潜山储集层的发育及控制因素认识不清。从沉积构造分析入手，对储集层的发育史及储集空间进行分析；然后用测井资料进行潜山岩性及裂缝识别，探寻潜山储集层的空间分布规律；最后结合试油资料，研究潜山基岩储集层发育的控制因素。研究发现：静北潜山基岩储集层的主要控制因素有岩性及岩性组合、成岩作用、风化作用及构造作用等；沉积环境控制储集层的岩性及岩性组合；岩性及成岩作用控制储集层原生孔隙及次生孔隙发育；风化作用和构造作用控制储集层的含油性，并影响了储集空间的后期改造。图3表3参12

Bedrock reservoir of Jingbei buried hill in Damintun Sag, Liaohe Depression

The strata of the Jingbei buried hill are made up of carbonate rocks in shallow sea and clastic rocks on shore in the Middle Proterozoic,mainly are carbonate rocks,quartz sandstone and argillaceous rocks.The rocks have experienced the following three periods: diagenesis of the dolomite,weathering corrosion-cementation and light metamorphosing.However,the key influencing factors which decide the reservoir capability have not been recognized.The developmental history and the storage feature of the reservoir are analyzed from tectonics and sedimentology.The log data is applied in studying the lithology and fractures to research the spatial distribution rules of the reservoir.With the evaluation result of the bedrock reservoir from the oil testing,the control factors affecting the reservoir development and storage capability are analyzed and summarized.It is showed that the control factors are lithology and lithologic association,diagenesis,weathering,and tectogenesis.Depositional environment decides the lithology and lithologic association;lithology and diagenesis decide the development of the primary pores and secondary interstices;weathering and tectogenesis control the oil storage and reconstruct the storage space.