鄂尔多斯盆地B区延长组长8储层四性关系及有效厚度下限研究

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。

Research on Four-property Relationship and Net Pay Cut-off Thickness of Chang 8 Reservoir in Yanchang Formation of B Area,Ordos Basin

Through the laboratory analysis of core and oil testing, combined with logging data and other information, four-property relationship of Chang 8 reservoir in Yanchang formation of B area, Ordos basin was studied. The results show that Chang 8 reservoir lithology is mainly light gray, dark grey fine - extremely t＇me-grained feldspathic lithic sandstone and the low maturity of components and the high textural maturity; The reservoir space is mainly solution pore, it belongs to low porosity and ultra-low permeability reservoirs; lithology and physical differences control oil and gas reservoir enrichment. Reservoir physical properties to determine its minimum standards are as follows： porosity 7.5%,permeability 0.15× 10-3 μm2,resistance 31 Ωm, transit-time 220 μs/m, water saturation less than or equal to 62%. The study can provide a theoretical basis for oil and gas exploration and development in the future.