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通过岩心、试油和分析化验等资料并结合测井资料,对鄂尔多斯盆地B区延长组长8储层进行“四性”关系研究。研究结果表明长8储层岩性主要为浅灰、深灰色细粒—极细粒长石岩屑砂岩或岩屑长石砂岩,成分成熟度较低而结构成熟度较高;储集空间以溶蚀孔隙为主,属于低孔、特低渗储层,岩性、物性的差异控制了储层油气的富集程度。确定了其储层物性下限标准为:孔隙度为7.5%,渗透率为0.15×10-3μm2;电性下限标准为:电阻率为31Ω·m。声波时差为220μs/m;含水饱和度小于等于62%。该研究为以后的油气勘探与开发工作提供了理论依据。
Through the core, oil testing and analysis of laboratory data and the combination of well logging data, the study on the relationship between the “four sexes” of Chang 8 reservoir of Yanchang Formation in Area B of Ordos Basin was conducted. The results show that the lithology of Chang 8 reservoir is mainly composed of light gray, dark gray fine-fine feldspar feldspathic lithic sandstone or lithic feldspar feldspar sandstone with low maturity and high structural maturity. The reservoir space Dissolved pores mainly belong to low porosity and ultra-low permeability reservoirs. The difference of lithology and physical properties controls the enrichment of oil and gas in reservoirs. The lower limit of physical properties of the reservoir is determined as follows: the porosity is 7.5% and the permeability is 0.15 × 10-3μm2; the lower limit of electrical resistance is: the resistivity is 31Ω · m. Sonic lag is 220μs / m; water saturation is less than or equal to 62%. This study provides the theoretical basis for the future exploration and development of oil and gas.