Oil and gas resource assessment method based on whole oil-gas system theory:taking the 3rd Member of Shahejie Formation in Wuqing Sag of Jizhong Depression as an example
In view of the unclear understanding of the distribution characteristics and hydrocarbon generation and expulsion potential of the 3rd Member source rocks of Wuqing Sag in Shahejie Formation,the hydrocarbon generation and expulsion model for the 3rd Member source rocks of Wuqing Sag in Shahejie Formation is established based on the theory of whole oil-gas system and the data of core,well logging and geogeochemical measurements in the study area.The source rock distribution,geochemical characteristics and in-source generation,expulsion and residual of hydrocarbon characteristics in the study area are clarified.The results show that:(1)The source rocks of the 3rd Member of Wuqing Sag in Shahejie Formation have the characteristics of large thickness,high organic matter abundance and favorable parent material type,which are in the stage of low-maturity to maturity.The 3rd Member source rocks have good oil-source matching relationship with several tectonic zones.(2)The total hydrocarbon generation is 4.95×1011 m3,the total hydrocarbons expulsion is 3.17×1011 m3 and the residual hydrocarbons is 1.78×1011 m3 in the 3rd Member source rocks of Wuqing Sag in Shahejie Formation,indicating significant hydrocarbon generation potential.(3)The calculation results based on whole oil-gas system theory include not only hydrocarbon generation,but also hydrocarbon expulsion(conventional+tight hydrocarbon)and residual hydrocarbon(shale hydrocarbon).The study provides guidance for deep oil-gas reservoir exploration of the 3rd Member in Shahejie Formation.
whole oil-gas systemoil and gas resource evaluationhydrocarbon generation potentialShahejie FormationWuqing SagJizhong Depression
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