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鄂尔多斯盆地陇东地区长82储集层平均孔隙度为8.8%,平均渗透率为0.64×10-3μm2,属于低孔低渗储集层。强烈的压实作用是储集层物性变差主要原因,碳酸盐胶结作用促使储集层物性进一步变差。尽管储集层物性整体较差,但在普遍低孔低渗背景下仍发育相对高孔渗的优质储集层。对优质储集层进行了分析,总结了优质储集层的典型特征,统计表明:优质储集层的塑性组分含量较低,孔隙类型以绿泥石胶结残余粒间孔和溶孔为主,孔隙结构以中小孔—中细喉为主。在此基础上,分析了优质储集层成因机理。研究认为:分流河道、河口坝等微相高能厚层砂体有利于优质储集层发育,相对低的塑性组分含量和绿泥石环边胶结有利于粒间孔隙的保存,溶蚀作用是次生孔隙形成的最主要成岩作用。
The average porosity of the Chang 82 reservoir in eastern Ordos Basin is 8.8% with an average permeability of 0.64 × 10-3μm2, which belongs to low porosity and low permeability reservoirs. The strong compaction is the main reason for the poor reservoir physical properties. The carbonate cementation makes the physical properties of the reservoir worse. Despite the poorest reservoir physical properties, high-permeability reservoirs with relatively high porosity and permeability are still developed under the general low-porosity and low-permeability background. High-quality reservoirs are analyzed and the typical characteristics of high-quality reservoirs are summarized. The statistics show that the content of plastic components in high-quality reservoirs is relatively low, and the pore types are mainly chlorite-cemented residual intergranular pores and dissolved pores, The structure of small holes - mainly in the small throat. On this basis, the formation mechanism of high-quality reservoir is analyzed. The study shows that: distributary channel, estuary dam and other microfacies high-energy thick sand body is conducive to the development of high-quality reservoirs, the relatively low content of plastic components and chlorite ring edge bonding is conducive to the preservation of intergranular pores, erosion is the second The most important diagenesis of pore formation.