大杨树盆地下白垩统九峰山组烃源岩生烃潜力评价  

Evaluation of hydrocarbon generation potential of source rocks in Lower Cretaceous Jiufengshan Formation in Dayangshu Basin,northeastern China

作　　者：王玉奎[1] WANG Yukui(Exploration and Development Research Institute of Daqing Oil Field Co.Ltd.,Daqing 163712,Heilongjiang,China)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《世界地质》2022年第4期793-804,共12页World Geology

基　　金：中国石油集团公司重大科技专项支撑项目(110017333002020)。

摘　　要：通过对大杨树盆地中部九峰山组烃源岩总有机碳、氯仿沥青“A”、岩石热解、显微组分、族组成和生物标志化合物的分析,讨论了九峰山组烃源岩的生烃潜力。结果表明:九峰山组烃源岩总有机碳、生烃潜力w(S_(1)+S_(2))和氯仿沥青“A”的平均值分别为2.30%、6.09 mg/g、0.0617%,表明有机质丰度较高,生烃潜力中等-高,为中等-好级别烃源岩;九峰山组烃源岩沉积于弱还原性的淡水-半咸水的湖盆,有机质类型为Ⅱ型,有机质来源为陆源高等植物和浮游生物的混合来源;烃源岩R_(o)、T_(max)、OEP和ICP均值分别为0.78%、452℃、1.08和1.25,霍烷Ts/(Ts+Tm)和甾烷C_(29ααα)20S/(20S+20R)均呈低值,反映有机质处于成熟阶段。综合评价表明研究区烃源岩生油气潜能中等。Based on the analysis of total organic carbon,chloroform asphalt“A”,rock pyrolysis,maceral,group composition and biomarker compounds of source rocks in the Jiufengshan Formation in central Dayangshu Basin,northeastern China,the hydrocarbon generation potential of the Jiufengshan Formation is discussed.The results show that the average values of total organic carbon content,hydrocarbon generation potential w(S_(1)+S_(2))and chloroform asphalt“A”content of the source rocks are 2.30%,6.09 mg/g and 0.0617%,respectively.This indicate that the organic matter abundance is high,the hydrocarbon generation potential is medium-high,and the Jiufengshan Formation consists of a medium-good grade source rocks.The source rocks of the Jiufengshan Formation were deposited in the lacustrine basin of weak reductive fresh water-brackish water.The type of organic matter is typeⅡ,and the source of organic matter is the mixed source of terrestrial higher plants and plankton.The average values of R_(o),T_(max),OEP and ICPof source rocks are 0.78%,452℃,1.08 and 1.25,respectively;and the values of hopane Ts/(Ts+Tm)and sterane C_(29ααα)20S/(20S+20R)are low,reflecting that organic matter is in the mature stage.The comprehensive evaluation shows that the hydrocarbon generation potential of the source rocks in the study area is medium.

关 键 词：下白垩统 九峰山组 烃源岩 生烃潜力 大杨树盆地 

分 类 号：P618.13[天文地球—矿床学]