雁石坪-温泉兵站地区侏罗系烃源岩地球化学特征  

Geochemical Characteristics of Jurassic Source Rocks in Yanshiping-Wenquanbingzhan Area

作　　者：范胜安 宋换新 文志刚 胡道功[2] Fan Sheng’an;Song Huanxin;Wen Zhigang;Hu Daogong(College of Resources and Environment,Yangtze University,Wuhan 430100,Hubei;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081)

机构地区：[1]长江大学资源与环境学院,湖北武汉430100 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《长江大学学报（自然科学版）》2020年第3期8-13,I0001,共7页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“金刚烷类在煤岩热演化过程中形成与转化”(41502133);中国地质调查局国家专项“天然气水合物勘查与试采专项”项目(GZHL20120301)。

摘　　要：鉴于雁石坪温泉兵站地区侏罗系烃源岩研究程度较低,对其侏罗系各层位碳酸盐岩和泥岩样品地球化学特征进行了研究。结果表明,碳酸盐岩有机质丰度相对较高,而泥岩均为非烃源岩;3个发育碳酸盐岩烃源岩层位中,雀莫错组为好中等烃源岩,索瓦组为中等较差烃源岩,布曲组为较差烃源岩;3个层位碳酸盐岩烃源岩样品抽提物的Pr/Ph、伽马蜡烷指数以及氧芴/硫芴等生物标志物参数说明烃源岩沉积于弱还原条件下的微咸水水体中,烃源岩有机质类型为有较多陆源有机质供给的混合型,侏罗系碳酸盐岩烃源岩总体处于成熟阶段。综合分析认为,研究区侏罗系碳酸盐岩烃源岩具有较好的生烃潜力。In view of the low research degree of Jurassic source rocks in Yanshiping-Wenquanbingzhan area,the research was carried out on the geochemical characteristics of carbonate rock samples and mudstone samples in various layers of the Jurassic system.The results show that the organic matter abundance of carbonate rocks is relatively high,while the mudstones are non-source rocks.Among the developed carbonate source rocks of three formations,the source rocks of the Quemocuo formation are good-medium,those of the Suowa formation are moderate-poor,and those of the Buqu formation are poor.The biomarker parameters of the extracts of three groups of carbonate source rock samples,such as Pr/Ph,gammacerane index and oxyfluorene/thiofluorene,indicate that the carbonate source rocks are deposited in brackish water under the weak reduction condition,the organic matter types of source rocks are mixed with more terrestrial organic matter supply,and the source rocks of Jurassic carbonate rocks are generally in the mature stage.It is comprehensively concluded that the source rocks of the Jurassic carbonate rocks in the research area have good hydrocarbon generation potential.

关 键 词：生烃潜力 地球化学特征 生物标志物 碳酸盐岩 侏罗系 雁石坪温泉兵站 

分 类 号：P618.13[天文地球—矿床学]