罗家地区沙河街组储集层成岩相与储集特征

沙河街组是济阳坳陷沾化凹陷罗家地区的主要储集层，近年在沙四段至沙一段获重大油气发现。以岩石学研究为基础，并利用Ｉ／Ｓ混层比、镜质体反射率及储集层物性等资料，对该地区沙河街组储集层成岩作用类型、特征进行详细研究。认为该地区沙河街组储集层成岩作用类型较多，压实、胶结作用是破坏孔隙的主要成岩作用，溶解作用是形成孔隙的主要成岩作用；属中成岩阶段，以２１００ｍ为界又划分出中成岩早期、晚期；发育压实、杂基支撑、碳酸盐胶结交代及碳酸盐溶解这４种成岩相类型。储集空间以溶解作用形成的次生孔隙为主，溶解作用分为大气淡水淋溶和埋藏溶解，后者与有机质成熟及粘土矿物转化有关。沙四上段砾岩体储集性相对较差，为低孔低渗—低孔中渗储集层，沙三段、沙二段砂岩和沙二段、沙一段碳酸盐岩储集性相对较好，为中孔中渗—高孔高渗储集层。图１表２参２（邹冬平摘）

The diagenesis and characters of reservoirs in Shahejie Formation in Luojia area, Jiyang sag.

The Shahejie Formation is the major reservoir in Luojia area of Zhanhua depression, which is divided into four members from up to down, Es 1, Es 2, Es 3 and Es 4. The present paper studies the diagenetic types and features in detail, and points out that dissolution is the major diagenesis generating pores and compaction and cementation are the major diagenesises diminishing pores. The diagenetic stages and diagenetic facies are also established in this paper. The Shahejie Formation belongs to the middle diagenetic stage and have four diagenetic facies which are matrix supported diagenetic face, compacted diagenetic face, carbonate cementing and replacing diagenetic face and carbonate dissoluted diagenetic face. The reservoirs of Shahejie Formation mostly belong to the carbonate dissoluted diagenetic face whose dissoluted pores are the main reservoir spaces. The dissolution is related to evolution of organic matter in Es 3 and Es 4 which generated CO 2 and formed acid liquid.