【摘要】 文留地区沙四段形成储集空间的有利因素和成岩作用:1.早期碳酸盐胶结物对成岩起了抑制作用。在压实过程中,早期胶结物的支撑避免了碎屑颗粒的充分靠近;2.次生孔隙构成了岩石的主要储集空间,北部的部分井在三千公民左右井深处,在一些薄片中见面孔率达20％;3.泥质杂基有时会对储集性质起好作用,因泥质起着抑制胶结的作用;4.南部地区存在泥岩储集层,其储集空间是溶蚀微孔隙和层间收缩缝,这些孔隙可使泥岩的渗透率达到10毫达西。更多还原

【Abstract】 Diagenesis and effective factors forming the reservoir bed in S4 member of oligocene at Wenliu District in Dongpu Depression are as follows. (1) Early carbonate cementation has impeded diagenesis, and the support of early cements has eliminated the further packing of detrital grains during compaction; (2) The major pore spaces are formed by the secondary pores and the porosity of the thin section in some samples from about 3,000 m depth of oil wells in the northern part of the depression reaches 20%; (3) Mudstone matrix may inhibit cementation and play an important part in affecting reservoir; (4) Mudstone reservoirs are revealed in the southern part and the reservoir spaces are dissolution micropores and contracted interval fissures. These pore spaces would make mudstone get an average permeability of 10 md.更多还原