东濮凹陷石炭—二叠系煤系烃源岩新生代生烃特征  

Hydrocarbon generation characteristics in the Cenozoic era of the Permo-Carboniferous coal measures source rock in Dongpu depression

作　　者：胡洪瑾 蒋有录[1] 刘景东[1] 徐田武[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石化中原油田分公司勘探开发科学研究院,河南濮阳457001

出　　处：《东北石油大学学报》2017年第4期53-60,115,共9页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2016ZX05006-007)

摘　　要：石炭—二叠系是东濮凹陷煤成气的主力气源岩,尚不明确煤、碳质泥岩和暗色泥岩等组分在新生代的成气演化特征。基于高压釜热模拟实验,对不同类型烃源岩的生气产率及气体组分演化特征进行分析。热模拟结果表明:初次加热过程中,不同类型烃源岩热解烃类气体产率随温度升高而增大,暗色泥岩生气能力最强,煤岩的次之,碳质泥岩的最差;不同类型烃源岩热解产物组分演化规律相似,随温度升高,甲烷摩尔分数逐渐增加,重烃气摩尔分数先增大后减小,非烃气摩尔分数减小。二次加热结果显示:研究区在新近纪可能存在规模成气;相比于一次生烃,二次生烃重烃气、总烃气及非烃气产率降低,但甲烷产率升高,干燥因数增大。研究结果对认识东濮凹陷煤成气演化规律、指导进一步勘探具有参考意义。Carboniferous-Permian is one of the main gas source rocks in Dongpu depression,and the evolution characteristics of coal-rock,carbonaceous mudstone and dark mudstone in the Cenozoic are not clear.Based on the autoclave thermal simulation experiment,the difference of the evolution characteristics of different types of source rocks between the two-stage hydrocarbon generations in the Cenozoic were analyzed.The results show that the hydrocarbon gas production of different types of hydrocarbon source rocks increases with increasing temperature,the dark mudstone has the strongest gas generation ability,followed by coal rock and the worst.The evolution of pyrolysis products in different types of source rocks is similar.With the increase of thermal simulation temperature,the methane content gradually increases,the heavy hydrocarbon gas content increases first and then decreases,and the content of non-hydrocarbon gas decreases.The secondary hydrocarbon generation results show that the yield of heavy hydrocarbon gas,total hydrocarbon gas and non-hydrocarbon gas in the secondary hydrocarbon generation is larger than that of the primary hydrocarbon generation,while the methane yield is higher and dry coefficient increases in the secondary hydrocarbon generation period.

关 键 词：煤系烃源岩 热模拟实验 石炭-二叠系 一次生烃 二次生烃 新生代 东濮凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]