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子午岭地区延长组长4+5油层组是研究区未来重要的油气勘探目的层,研究储层特征及其形成控制因素,对于寻找低渗透背景条件下优质储层具有重要的意义。系统研究了子午岭地区延长组长4+5油层组储层的岩石学、储层微孔隙结构和非均质性特征,分析了沉积相、成岩作用等对于储层发育特征的控制作用。认为研究区储集层物性较差且非均质性较强,不同岩石类型、沉积微相类型、成岩作用对研究区储层性能有重要影响。研究区局部地区展现了很好的物性特征,而这些地区主要受到沉积作用和后期成岩作用的联合控制,由此,寻找局部相对高渗的油气复合区,是油气勘探的关键。
The 4 + 5 reservoir group of the extension group leader in the Ziwuling area is the future important hydrocarbon exploration target layer in the study area. It is of great significance to search for reservoir characteristics and formation control factors in search of high-quality reservoirs under low-permeability background conditions. The petrology, micropore structure and heterogeneity of reservoirs in the 4 + 5 reservoir of Yanchang Formation in the Ziwuling area have been studied systematically. The controlling roles of sedimentary facies and diagenesis on the reservoir development characteristics have also been analyzed. It is considered that the reservoirs in the study area have poor physical properties and strong heterogeneity. Different rock types, types of sedimentary microfacies and diagenesis have an important influence on the reservoir performance in the study area. Some parts of the study area show good physical characteristics, and these areas are mainly controlled by the combination of sedimentation and later diagenesis. Therefore, it is the key to oil and gas exploration to find the relatively high-permeability hydrocarbon complex.