西湖凹陷平湖组不同煤系烃源岩热解生烃差异及其在油气勘探中的应用  

Differences in Pyrolysis Hydrocarbon Generation and Hydrocarbon Exploration of Different Coal-Measures Source Rocks in Pinghu Formation,Xihu Sag

作　　者：谭思哲 侯凯文 覃军 汤睿 杨敏 Tan Sizhe;Hou Kaiwen;Qin Jun;Tang Rui;Yang Min(Shanghai Branch of CNOOC Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《吉林大学学报（地球科学版）》2020年第4期968-978,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家科技重大专项(2016ZX05027-001)。

摘　　要：本文以西湖凹陷平湖组不同煤系烃源岩(煤、炭质泥岩和暗色泥岩)为研究对象,通过封闭体系黄金管-高压釜生烃动力热模拟实验,查明了3种煤系烃源岩生烃产物、产率特征及生烃演化规律的差异。研究结果表明:在西湖凹陷平湖组煤系烃源岩中,煤、炭质泥岩和暗色泥岩均具有很高的产气态烃能力和较高的产液态烃能力,但不同岩性样品的生烃演化模式存在一定差异。炭质泥岩生烃最早,生烃强度最大;煤居次,生烃稍晚,生烃强度稍低;暗色泥岩生烃最晚,生烃强度最低。根据热解生烃特征,指出西湖凹陷具有煤成油的勘探潜力,西部斜坡带是找油的有利区域。This study mainly focuses on different coal-measures source rocks(coal,carbon mudstone,and dark mudstone)in Pinghu Formation of Xihu sag.Based on the thermal simulation experiment of closed-system gold tube-high pressure vessels,the differences of hydrocarbon products,yield characteristics,and the hydrocarbon generation dynamics among the three coal series source rocks were analyzed.It is discovered that coal,carbon mudstone,and dark mudstone have high generation capacity of gas and liquid hydrocarbon,but their hydrocarbon generation evolution models are different.The carbonaceous mudstone has the earliest hydrocarbon generation and the highest intensity;the coal rock ranks the second in hydrocarbon generation and the hydrocarbon generation intensity;the mudstone has the latest hydrocarbon generation,and its hydrocarbon generation intensity is the lowest.According to the characteristics of pyrolysis hydrocarbon generation,Xihu sag has the potential of coalderived oil exploration,and the western slope belt is a favorable area for oil exploration.

关 键 词：煤系烃源岩 生烃特征 勘探启示 平湖组 西湖凹陷 

分 类 号：P624.4[天文地球—地质矿产勘探]