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高台子油层为龙虎泡地区主要含油层,储层岩性以含泥粉砂岩为主。通过岩心观察和化验分析对其成岩作用研究表明:压实作用使原始孔隙减少,不利于储集空间的保存;胶结作用和溶蚀作用同步进行,早期胶结作用抑制压实作用强度,胶结物后期溶解可有效改善储层物性。根据蒙脱石、高岭石、伊利石等黏土矿物特征及演化阶段推断储集岩成岩作用已达到晚成岩阶段中期。另外,研究区高台子油层主要为三角洲前缘相沉积,岩石碎屑颗粒间孔隙被泥质充填,加之后期大量自生黏土矿物生成,使岩石碎屑颗粒间孔隙以小孔为主,孔隙结构复杂,沉积作用与成岩作用共同决定了高台子油层中孔、低渗特征。
The Gaotaizi oil layer is the main oil-bearing layer in the Longhupao area, and the reservoir lithology is dominated by muddy siltstone. The study of diagenesis by core observation and laboratory analysis shows that: the compaction reduces the original porosity and is not conducive to the preservation of the reservoir space; the cementation and dissolution are carried out simultaneously. The early cementation inhibits the compaction intensity and the later dissolution Can effectively improve reservoir physical properties. According to the characteristics and evolution of clay minerals such as montmorillonite, kaolinite and illite, it is deduced that diagenesis of reservoir rocks has reached the middle stage of late diagenetic stage. In addition, the Gaotaizi oil layer in the study area is mainly delta front facies sedimentary. The intergranular pores of rock detrital grains are filled with muddy sediments. In addition, a large amount of authigenic clay minerals are formed in the later period, which make the intergranular pores of rock detritus mainly pore and the pore structure is complex Sedimentation and diagenesis jointly determine the characteristics of middle porosity and low permeability in Gaotaizi reservoir.