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松辽盆地南部彰武断陷九佛堂组发育大套半深湖—深湖相暗色泥页岩夹油页岩层.在岩心观察、薄片鉴定和扫描电镜分析基础上,结合泥页岩的分布、电性和地化特征、含油气性、储集和保存条件等,研究九佛堂组富有机质的暗色泥页岩的页岩油气资源潜力.结果表明:九佛堂组暗色泥页岩在测井曲线上具有“三高一低”的响应特征,纵向上厚度大,可识别上、下两段泥页岩层系,横向上展布较广;有机质丰度高,达到好的烃源岩标准,干酪根以Ⅰ型和Ⅱ1型为主,镜质体反射率(Ro)为0.54%~1.10%;泥页岩含油气性较好,晶间、粒间微孔隙和微裂缝较发育;脆性矿物平均质量分数高达51.4%,易于储层压裂改造.九佛堂组沉积后期构造活动较弱,有利于页岩油气的保存.运用概率体积法估算页岩油资源量为12 442.0×104 t.
In the Jiufadang Formation of Changwu Depression, southern Songliao Basin, a large set of deep-lacustrine muddy shale oil-bearing shale was developed.On the basis of core observation, thin slice identification and scanning electron microscopy analysis, combined with the distribution of shale, Electricity and geochemical characteristics, oil and gas, reservoir and preservation conditions, the potential of shale hydrocarbon resources of organic-rich dark shale in Jiufotang Formation was studied.The results show that the shale of Jiufotang Formation There is a “three high and one low” response characteristic on the well curve, with a large thickness in the vertical direction, which can identify the upper and lower mud shale strata, which are widely distributed in horizontal direction. The abundance of organic matter reaches a good hydrocarbon source Rock type, the kerogen is mainly type I and type II1, and the vitrinite reflectance (Ro) is 0.54% -1.10%. The shale has better oil and gas, micropores and micro-cracks in intergranular, intergranular . The average mass fraction of brittle minerals is as high as 51.4%, which is easy to be improved by reservoir fracturing. The tectonic activity of Jiufotang Formation during late sedimentation is weak, which is favorable for the preservation of shale oil and gas. Estimating the amount of shale oil resources by the method of probability volume is 12 442.0 × 104 t.