淮南地区石炭—二叠系泥页岩有机地球化学特征  

Organic geochemical characteristics of Carboniferous-Permian mud shale from Huainan area

作　　者：刘会虎[1,2] 胡宝林[1] 薛俊华[2] 徐宏杰[1] 张文永[3] 郑凯歌[1] 兰天贺 任波[2] 

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]淮南矿业(集团)有限责任公司深部煤层开采和环境保护国家重点实验室,安徽淮南232001 [3]安徽省煤田地质局勘查研究院,安徽合肥230088

出　　处：《中南大学学报（自然科学版）》2016年第6期2100-2109,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41302129;41402140);山西省煤层气联合研究基金资助项目(2012012008);安徽省国土资源厅公益性项目(2012-g-17);安徽省自然科学基金资助项目(1408085QE88)~~

摘　　要：通过系统采样,应用有机碳分析、岩石热解、镜质组反射率测定、干酪根显微组分及类型鉴定、干酪根C同位素分析等油气地球化学测试方法,综合研究淮南地区碳—二叠系泥页岩的有机地球化学特征。研究结果表明:淮南地区石炭二叠系太原组泥页岩有机碳质量分数平均为2.08%,山西组泥页岩有机碳质量分数平均为2.58%,下石盒子组泥页岩有机碳质量分数平均为1.07%,上石盒子组泥页岩页有机碳质量分数平均为0.57%,孙家沟组泥页岩有机碳质量分数为0.12%。泥页岩中有机质类型主要为Ⅱ2型干酪根。研究区石炭—二叠系泥页岩样品镜质体反射率Ro均高于0.7%,太原组、山西组及下石盒子组岩石热解峰温基本上超过435℃,有机质热演化基本达到成熟—高成熟阶段。对比分析结果表明淮南地区石炭—二叠系的太原组、山西组和下石盒子组有机质丰度较高,生烃潜力大,有机质热演化程度较高,是页岩气勘探的有利层位。The organic geochemical characteristics of Carboniferous—Permian mud shale in Huainan area were comprehensively studied, by means of systemic sampling, and petroleum geochemical testing methods such as organic carbon analysis, rock pyrolysis analysis, measurement of vitrinite reflectance, identification of maceral in kerogen and kerogen type, and carbon isotope of kerogen analysis. The results show that the average organic carbon mass fraction in mud shale from Taiyuan formation is 2.08%, the average organic carbon mass fraction in mud shale from Shanxi formation is 2.58%, the average organic carbon mass fraction in mud shale from Lower Shihezi formation is 1.07%, the average organic carbon mass fraction in mud shale from Upper Shihezi formation is 0.57%, and the average organic carbon mass fraction in mud shale from Sunjiagou formation is 0.12%. The organic matter type of Carboniferous—Permian mud shale is mainly type Ⅱ2. Vitrinite reflectance Ro of mud shale samples from the studied area is all higher than 0.7%, and the maximal rock pyrolysis temperatures of mud shale from Taiyuan formation, Shanxi formation and Lower Shihezi formation are above 435 ℃, which indicates organic matter in hydrocarbon source rocks mostly achieves mature： high mature stage of evolution. The contrast analysis results suggest Taiyuan formation, Shanxi formation and Lower Shihezi formation of Carboniferous — Permian are favorable formation for shale gas exploration because of their higher organic matter abundance, good hydrocarbon generation potential and relative high thermal evolution degree of organic matter.

关 键 词：淮南地区 石炭—二叠系 泥页岩 有机地球化学 页岩气 

分 类 号：TE12[石油与天然气工程—油气勘探]