黔南坳陷牛蹄塘组富有机质页岩生气期和生气量  

Gas generation period and quantity of organic-rich Niutitang Shale in Qiannan Depression,China

作　　者：陈方文 卢双舫 丁雪 

机构地区：[1]中国石油大学非常规油气与新能源研究院 [2]中国石油大学化学工程学院

出　　处：《中国石油大学学报（自然科学版）》2016年第3期55-62,共8页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(41302101;41330313);国家油气重大专项(2011ZX05007-001)

摘　　要：通过对华北地台上元古界青白口系下马岭组页岩样品和塔里木盆地寒武系富有机质页岩生成的原油样品进行热解实验,结合沉积史、热史等,利用化学动力学方法对黔南坳陷下寒武统牛蹄塘组富有机质页岩主要生气期和生气量进行研究。结果表明：黔南坳陷牛蹄塘组富有机质页岩主要成油期约为510～430 Ma,即早奥陶世早期至早奥陶世晚期,主要成气期约为500～240 Ma,即早奥陶世至晚二叠世;黔南坳陷牛蹄塘组富有机质页岩成气由干酪根成气和原油裂解成气两个阶段组成,分别约为500～475 Ma和400～240 Ma,即早奥陶世至中奥陶世和泥盆纪至早二叠世;黔南坳陷牛蹄塘组富有机质页岩的总生气量约为2 735.7×10^11m3,主要生气时期为奥陶纪、泥盆纪和石炭纪,单位质量页岩生气量分别为14.72、8.87和6.54 m3/t,依次占总生气量的41.0%、24.7%和18.0%。In order to evaluate the gas generation period and quantity of the organic-rich Niutitang Shale in Qiannan Depression, pyrolysis experiments were performed using the samples of Xiamaling Shale from the Upper Proterozoic Qingbaikou system in the North China Platform, and the crude oil generated from the Lower Cambrian source rocks in Tarim Basin. Combining the sedimentary and thermal history of the study area, the gas generation period and quantity were calculated using the chemical kinetic method. The results show that the oil generation period of Niutitang Shale is about 510-430 Ma in Qiannan Depression, i.e. , from the early stage of Early Ordovician to the end of Early Ordovician. The gas generation period of Niutitang Shale is about 500-240 Ma, from the Early Ordovieian to the Late Permian, including two stages that are gas generation from kerogen （500-475 Ma） and gas generation from oil cracking （400-240 Ma） , from the Early Ordovieian to the Middle Ordovician and from the Devonian to the Early Permian, respectively. The total gas generation quantity of the organicrich shale from Niutitang Shale in Qiannan Depression is about 2735.7×10^11 m^3. The main gas generation periods are Ordovician, Devonian and Carboniferous. Accordingly, the gas generation quantity is 14. 72 m3/t, 8. 87 m3/t and 6. 54 m3/t, respectively, which is 41.0%, 24. 7% and 18.0% in the total gas generation quantity from unit weight shale, respectively.

关 键 词：黔南坳陷 牛蹄塘组 富有机质页岩 生气期 生气量 

分 类 号：TE122[石油与天然气工程—油气勘探]