塔里木盆地瓦石峡凹陷下侏罗统康苏组生烃条件及与邻区的对比  

Hydrocarbon Generation Conditions and Regional Comparison of the Lower Jurassic Kangsu Formation in Washixia Sag,Tarim Basin

作　　者：张贺 姜正龙[1] 李雅君 梁爽[2] 付文凯 ZHANG He;JIANG Zhenglong;LI Yajun;LIANG Shuang;FU Wenkai(School of Marine Sciences,China University of Geosciences,Beijing 100083,China;Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)海洋学院,北京100083 [2]中国石油勘探开发研究院,北京100083

出　　处：《现代地质》2019年第6期1241-1251,共11页Geoscience

基　　金：中国地质大学(北京)发展基金项目(F13011)

摘　　要：塔里木盆地东南坳陷烃源条件制约了油气的勘探,至今尚未突破。目前证实侏罗系杨叶组和康苏组具备一定的生烃潜力。通过野外地质考察,进行了剖面测量、样品采集和地球化学测试,结合若参1井、若参2井和且地1井等3口钻井资料、样品分析数据,开展了塔东南瓦石峡凹陷下侏罗统康苏组烃源岩岩性、空间展布特征及地球化学特征研究。瓦石峡凹陷康苏组烃源岩主要为暗色泥岩和碳质泥岩,厚度为60~140 m,占地层厚度的25%,若参1井和红柳沟老煤矿一带有机质丰度较高,暗色泥岩的有机碳含量为1. 2%~4. 4%、碳质泥岩的为5. 0%~39. 6%,干酪根为Ⅱ2-Ⅲ型,处于低成熟-成熟阶段。与盆地周缘同时期沉积烃源岩相比,塔北库车坳陷烃源岩生烃潜量相对高于塔东南瓦石峡凹陷,塔西南喀什凹陷库兹贡苏等剖面则较差。因此,研究认为瓦石峡凹陷具有较好的生烃潜力,其中若参1井东南部深凹区和红柳沟老煤矿-其格勒克山前洼陷区较为有利。The Southeast Depression of the Tarim Basin has not seen much breakthrough in oil and gas exploration due to the hydrocarbon source conditions. Currently,the Jurassic Yangye and Kangsu formations have been suggested to have hydrocarbon generation potential. Based on field geological surveys,section survey,sample collection and geochemical test are completed. Combined with the drilling and sample analysis data from the wells Ruocan 1,Ruocan 2 and Qiedi 1,we discuss the lithology,spatial distribution characteristics and geochemical features of the source rock of the Lower Jurassic Kangsu Formation in the Washixia Sag,SE Tarim Basin. The source rocks are mainly dark mudstone and carbonaceous mudstone with a thickness of about 60 to 140 m( 25% of the formation). Organic abundance of well Ruocan 1 and Hongliugou Old Coal Mine is relatively high,and the organic carbon contents of dark mudstones and carbonaceous mudstones are 1. 2% to 4. 4%,and5. 0% to 39. 6%,respectively. The types of kerogen are Ⅱ2 to Ⅲ,which are mainly in the low-mature to mature stage. Compared with the sedimentary source rocks in the same period of the basin periphery,hydrocarbon potential of the source rocks in the Washixia Sag is lower than that in the Kuche Depression in the northern Tarim Basin,but higher than that in the Kuzigongsu Section of the Kashi Sag( SW Tarim Basin). Therefore,we consider that the Washixia Sag has higher hydrocarbon potential,especially for the deep concave area southeast of well Ruocan 1,and the piedmont subsag around Hongliugou Old Coal Mine-Qigeleke.

关 键 词：塔里木盆地 瓦石峡凹陷 康苏组 烃源岩 地球化学特征 

分 类 号：TE122[石油与天然气工程—油气勘探]