松南上白垩统青山口组一段不同赋存状态页岩油定量评价

松辽盆地南部青山口组一段页岩油资源丰富，多口井试油获得工业及高产油流，具有较大的勘探开发潜力。本文以青山口组一段下段为研究对象，以页岩油赋存状态为切入点，重点针对研究区页岩油富集优质岩相,即高有机质薄片状页岩和中有机质纹层状页岩中溶胀油、吸附油以及游离油量进行定量评价，揭示页岩油在地下页岩层系储层中的赋存特征。青山口组一段页岩油主要以干酪根溶胀态、干酪根吸附态、有机质孔隙游离态、无机矿物吸附态及无机孔隙游离态等5种赋存形式存在于页岩层系储层中。其中：高有机质薄片状页岩中页岩油赋存状态以干酪根溶胀油、干酪根吸附油和有机质孔隙游离油等有机赋存油为主，有机赋存油量可高达253.0 mg/g TOC，以TY1井页岩油赋存量最大，其次为CY8井，H238井页岩油量最低；中有机质纹层状页岩中页岩油赋存状态以无机矿物吸附油、无机孔隙游离油等无机赋存油为主，可达167.0 mg/g TOC，CY8井页岩油赋存量最大，H258井次之，H238井页岩油量最低。TY1井、CY8井位于半深湖—深湖区，发育大套泥页岩；H238井位于三角洲外前缘，离物源区较近，导致其页岩油赋存量明显低于半深湖—深湖区。因此，沉积环境是导致不同工区页岩油赋存量差异的主要原因。

Quantitative Evaluation of Shale Oil in Different Occurrence States in First Member of Qingshankou Formation of Upper Cretaceousin South of Songliao Basin

China's continental shale oil resource has great potential, and is an important alternative energy source for the petroleum industry. The First Member of Qingshankou Formation in the South of Songliao basin is rich in shale oil resources, and industrial and high-yield oil flows have been found in many wells through oil testing. Taking the Lower Part of the First Member of Qingshankou Formation as the research object, and the occurrence state of shale oil as the pointcut, this paper focuses on the quantitative evaluation of the amount of swelling oil, adsorbed oil, and free oil in shale oil enriched in high-quality lithofacies such as high organic matter lamellar shale and medium organic matter laminar shale, so as to reveal the occurrence characteristics of shale oil in underground shale reservoirs, and to provide guidance for further exploitation of shale oil in the South of Songliao basin. The shale oil is mainly stored in shale reservoirs in five states: Kerogen swelling state, kerogen adsorption state, organic pore free state, inorganic mineral adsorption state, and inorganic pore free state; Among them, the occurrence state of shale oil in high organic matter lamellar shale is mainly organic occurrence oil such as kerogen swelling oil, kerogen adsorption oil and organic pore free oil, and the organic occurrence oil amount can be as high as 253.0 mg/g TOC. The shale oil amount of well TY1 is the largest, followed by well CY8, and the amount of well H238 is the lowest; The occurrence state of shale oil in medium organic laminar shale is mainly inorganic occurrence oil such as inorganic adsorbed oil and inorganic pore free oil, up to 167.0 mg/g TOC. Well CY8 has the largest amount of shale oil, followed by well H258, and well H238 has the lowest amount of shale oil. Well TY1 and well CY8 are located in the semi deep-deep lake, where a large set of mud shale is developed, while well H238 is located in the outer front of the delta and closed to the source area, resulting in significantly lower shale oil accumulation than the wells in semi deep-deep lake. Therefore, the sedimentary environment is the main reason for the difference of shale oil accumulation in different areas.