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研究鄂尔多斯盆地志丹地区长9油层组的储层地质特征,通过钻井取心、薄片鉴定、物性分析及测井等资料,综合分析长9油层组的沉积、储层和成岩作用特征及其储集物性的影响因素。研究表明:长9油层组主要为三角洲前缘水下分流河道、滨浅湖和半深湖—深湖沉积,岩性以细粒长石砂岩和长石岩屑砂岩为主,整体具有成分成熟度低而结构成熟度较高的特点,孔隙类型以残余粒间孔和溶蚀孔隙为主,储层物性差,为超低孔低渗的致密砂岩储层。鄂尔多斯盆地志丹地区长9储层地质特征复杂,储集物性受沉积微相和成岩作用的共同控制,以水下分流河道砂为主要储集体,压实作用和胶结作用使储层物性明显变差,而溶蚀作用对储层物性起主要贡献作用。
This paper studies the reservoir geologic characteristics of Chang 9 reservoir in the Zhidan area, Ordos Basin. The sedimentary, reservoir and diagenetic characteristics of Chang 9 oil reservoir are analyzed by drilling coring, sheet identification, physical property analysis and logging data. Set of physical factors. The results show that the Chang 9 reservoir is mainly composed of delta front submarine distributary channel, shallow lake and semi-deep lake-deep lake. The lithology mainly consists of fine-grained feldspar sandstone and feldspathic lithic sandstone, Low degree of structural maturity and higher characteristics of the pore type of residual intergranular pores and dissolved pores mainly reservoir properties of poor, low porosity and permeability of tight sandstone reservoir. The reservoir of Chang 9 reservoir in Zhidan area of Ordos Basin is complex in geology, and its reservoir property is controlled by sedimentary microfacies and diagenesis. Submarine distributary channel sand is the main reservoir. Compaction and cementation make the reservoir properties obviously change Poor, and dissolution plays a major role in reservoir physical properties.