成都理工大学学报（自然科学版）2016，Vol.43Issue(2)：163-176,14.DOI:10.3969/j.issn.1671-9727.2016.02.03
沁水盆地石炭-二叠煤系地层烃源岩特征及生烃有利区评价
Hydrocarbon source rock characteristics and favorable hydrocarbon-generating area evaluation of Carboniferous-Permian coal measures strata in Qinshui basin,Shanxi,China
摘要
Abstract
The hydrocarbon source rocks of the Carboniferous-Permian coal measures strata in Qinshui basin contain coal rock,mudstone and limestone.This paper analyzes and summarizes a large amount of the organic geochemical characteristic data about hydrocarbon source rocks.The result shows that the maceral composition of the coal rock samples of Lower Carboniferous Shanxi Group and Upper Permian Taiyuan Group in the Qinshui basin mainly contains vitrinite,followed by the inertinite,and the content of stable components (exinite + sapropel group)is low,generally <1.2%;H/C atomic ratio of kerogen is mainly 0.20 ~ 0.85,and O/C atomic ratio of kerogen is mainly 0.02 ~ 0.10, belonging to the high evolution stage Ⅲ type organic matter;the carbon isotope of the coal rock is common heavy,and the distribution range is - 23‰ ~ - 25.6‰;the content of the saturated hydrocarbon of bitumen “A”is commonly <25%,and that of the aromatics hydrocarbon is higher, the range is 11%~58%,the saturated hydrocarbon/aromatics hydrocarbon is generally <0.4.The maceral composition of the mudstone in the coal measures strata mainly contain vitrinite,followed by the inertinite,and the content of exinite is low;H/C atomic ratio of kerogen is 0.25~0.75,and O/C atomic ratio of kerogen is 0.03~0.20,belonging to the high evolution stage Ⅲ type organic matter, and a little belonging to the Ⅱ type organic matter;the carbon isotope of the coal rock is common heavy,and the distribution range is -23.5‰~-25.9‰;the content of the saturated hydrocarbon is<25%,commonly less than 20%.The Taiyuan Group limestone mainly contains Ⅱ2 type kerogen, and the carbon isotope is lighter than the coal rock and the mudstone of Shanxi Group and Taiyuan Group,ranging in - 26‰ ~ - 30‰. Finally, the paper evaluates the favorable hydrocarbon-generating areas of the hydrocarbon source rock strata of the coal measures strata in the Qinshui basin and draws the hydrocarbon-generating potential evaluation standard suitable for the coal rock and the mudstone of this area.The result shows that the coal rock of Shanxi Group in the Qinshui basin is medium-good hydrocarbon source rock in general.If only from the point of view of the organic matter abundance,the hydrocarbon source rocks in the two wings of the basin are good,that in the central and southern parts are medium-poor;the coal rock in Taiyuan Group is generally medium-good hydrocarbon source rock,the hydrocarbon source rocks in the two wings of the basin are mostly good, in the area of Qinxian-Qixian-Yuci-Yushe and the southern area,there are poor-medium hydrocarbon source rocks;the mudstone of Shanxi Group in the Qinshui basin is medium-poor hydrocarbon source rock,only that in part of the area in the west is good hydrocarbon source rock,the hydrocarbon potential in the middle area of the basin is poorer than that in the two wings;the mudstone in Taiyuan Group is middle-poor hydrocarbon source rock,the local area in the west is good hydrocarbon source rock,the hydrocarbon-generating potential on the edge of the basin is larger than that in the central area of the basin.关键词
沁水盆地/煤系地层/山西组/太原组/烃源岩/生烃有利区/评价Key words
Qinshui basin/coal measures strata/Shanxi Group/Taiyuan Group/hydrocarbon source rock/hydrocarbon-generating/evaluation分类
能源科技引用本文复制引用
尹帅,丁文龙,胡秋嘉,刘建军,梅永贵,刘忠..沁水盆地石炭-二叠煤系地层烃源岩特征及生烃有利区评价[J].成都理工大学学报（自然科学版）,2016,43(2):163-176,14.基金项目
国家自然科学基金资助项目（41372139，41072098）；国家科技重大专项专题（2011ZX05018-001-002，2011ZX05009-002-205，2011ZX05033-004）。 （）
