川中—川西南地区雷三段碳酸盐烃源岩生烃评价

评价川中—川西南地区中三叠统雷口坡组第三段暗色碳酸盐烃源岩的生烃能力,预测雷口坡组天然气新的勘探领域.在典型钻井岩心和岩屑样品的有机地球化学特征分析基础上,结合测井解释TOC技术,刻画出27口井的有效烃源岩厚度,并且应用有机质热模拟参数法对各井烃源岩的生气强度进行定量计算.研究表明:暗色碳酸盐烃源岩的残余有机碳质量分数...

Evaluation of hydrocarbon generation of carbonate source rocks in the third member of Leikoupo Formation in central and southwest Sichuan Basin,China

Based on the analysis of organic geochemical characteristics of typical drilling cores and cuttings,combined with TOC logging interpretation technology,the effective hydrocarbon source rock thickness of 27 wells was delineated,and the gas generation intensity of each well was quantitatively calculated by using organic matter thermal simulation parameter method.The aim of the research is to evaluate the hydrocarbon generation capacity of dark carbonate source rocks in the third member of Leikoupo Formation in the central to southwestern Sichuan area and to predict the new exploration area of natural gas in Leikoupo Formation.The results show that the residual organic carbon content of Leikoupo Formation dark carbonate source rocks ranges from 0.33%to 3.37%,with an average of 0.72%.It is determined that he organic matter types of source rocks are mainly type Ⅱ₁-Ⅱ₂, and vitrinite reflectance and maximum pyrolysis peak temperature are in a high maturity evolution stage.The average effective thickness of source rock is 43.1 m and the accumulative average gas generation intensity is 4.55×10⁸ m³/km².It is considered that the carbonate source rocks of the third member of Leikoupo Formation have a certain hydrocarbon generation capacity and the Well Chongtan 1 area north of Ziyang-Gaoshiti structure to the middle of Sichuan Basin is expected to become a new exploration area of Leikoupo Formation natural gas.