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通过岩石薄片、铸体薄片、阴极发光、电镜扫描等方法,结合地质录井和测井资料,对富黄探区延长组长6油藏储层特征进行了研究。研究结果表明,长6岩石类型以长石石英砂岩及岩屑石英砂岩为主。结构成熟度较高,其主要储集空间是残余粒间孔和粒间孔。研究区的成岩作用主要有压实作用、胶结作用和溶蚀作用。压实作用、胶结作用对储层孔隙起着破坏性作用,是形成特低渗透储层的主要原因,而溶蚀作用使储层孔隙和渗透率增大,对特低渗储层储集性能的改善具有积极的意义。
The reservoir characteristics of Chang 6 reservoir of Yanchang Formation in the Yellow River rich area have been studied by the methods of rock thin slice, cast thin slice, cathodoluminescence and electron microscope scanning combined with the geological logging and well logging data. The results show that the Chang 6 rock type is mainly feldspar quartz sandstone and lithic quartz sandstone. Structure maturity is high, the main reservoir space is residual intergranular pores and intergranular pores. Diagenesis in the study area mainly includes compaction, cementation and dissolution. Compaction and cementation play a destructive role in reservoir porosity, which is the main reason for the formation of ultra-low permeability reservoirs. However, dissolution and porosity increase the porosity and permeability of reservoirs. Improvements have a positive meaning.