四川盆地仪陇-平昌地区凉高山组页岩生烃特征及页岩油资源潜力OA

In order to clarify hydrocarbon generation characteristics and shale oil resource potential of Lianggaoshan Formation shale in Yilong-Pingchang area of Sichuan Basin,material balance method,thermal simulation experi-ment and basin simulation method are used to conduct the research on the original hydrocarbon generation poten-tial,hydrocarbon generation and expulsion efficiency and hydrocarbon generation,as well as shale oil resource esti-mation based on the principles of genesis and volume,and the division of shale oil resource potential zones is com-pleted.The results show that Lianggaoshan Formation in Yilong-Pingchang area shale has large net pay thickness(40～80 m),favorable organic matter type(Type Ⅱ),moderate abundance(w(TOC)of 0.50%～3.39%)and high maturity(Ro 1.0%to 1.9%).The average original hydrogen index of shale is 522 mg/g.Conditions for oil generation are abundant when the hydrocarbon generation conversion rate is 70%～95%,and the vitrinite reflectance is 1.04%～1.72%.Hydrocarbon generation of Lianggaoshan Formation shale in studied area estimated by the organic carbon-hydrogen index formula method and basin simulation method are 92.26×108 and 94.02×108 t,respectively.Shale oil resources estimated by the genetic method and volume method are 25.60×108 and 27.35×108 t,respectively.The studied area is located in Class I favorable areas for shale oil and shale gas resource potential.Central Longgang-Pingchang area is Class IA favorable area for shale oil resource potential,while northern Pingchang and areas north of Pingchang are Class IA favorable areas for shale gas resource potential.The overlapping area of the two is favor-able area for shale oil and gas resource potential.The research provides new ideas for the study of hydrocarbon gen-eration characteristics of similar types of shale and shale oil resource potential.