摘要
为对黔北宽阔-浮焉地区五峰组-龙马溪组页岩气有利区进行预测,在前人研究成果调研基础上,利用26条露头剖面资料、QSD1钻井资料、样品分析测试资料,结合地震、电磁资料,对研究区五峰组-龙马溪组底面埋深、页岩的岩类学特征及沉积相、分布、总有机碳含量(TOC)、有机质成熟度(Ro)、脆性矿物含量的变化进行了分析并预测了页岩气有利区。研究区五峰组-龙马溪组底面埋深多为0~1500 m,最大埋藏深度为1926 m;主要由泥岩、粉砂质泥岩组成,夹薄层泥质粉砂岩、偶见泥灰岩,为泥质深水陆棚微相沉积;地层厚度普遍超过30 m,东北部地层厚度大,最大厚度超过90 m,西南部地层厚度小,最大厚度不足50 m;TOC分布具有中部低(<2.0%)、东北部和西南部高(>3.5%)的特征;Ro为1.20%~3.17%、平均值多大于2.50%,主要为过成熟烃源岩;脆性矿物含量多在50%以上,具有中部低(<60%)、东北部和西南部高(>70%)的特征。综合上述页岩气有利区预测指标,分3类预测了有利区的分布,浮焉-小雅向斜中部Ⅰ类有利区是下步页岩气勘探的首选靶区。
In order to predict the favorable shale gas area of Wufeng Formation-Longmaxi Formation in Kuankuo-Fuyan area,Northern Guizhou Province,on the basis of previous research results,based on data of 26 outcrop profiles and well QSD1,sample analysis and testing,combined with seismic and electromagnetic data,the buried depth of the bottom of Wufeng Formation-Longmaxi Formation,the petrological characteristics and sedimentary facies types of shale,the changes of total organic carbon(TOC),organic matter maturity(Ro)and brittle mineral content are analyzed,and the favorable areas for shale gas are predicted.The buried depth of the bottom of Wufeng Formation-Longmaxi Formation in the study area is mostly 0~1500 m,and the maximum buried depth is 1926 m;It is mainly composed of mudstone and silty mudstone,intercalated with thin argillaceous siltstone and occasional marlstone,which is argillaceous deep-water shelf sediments;The thickness of the strata is generally more than 30m,in the northeast is large,and the maximum thickness is more than 90 m,in the southwest is small,and the maximum thickness is less than 50 m;The distribution of TOC is low(<2.0%)in the middle and high(>3.5%)in the northeast and southwest;Ro is between 1.20%and 3.17%,and the aver-age value is more than 2.50%,which is mainly over mature source rock;The content of brittle minerals is more than 50%,which is low(<60%)in the middle and high(>70%)in the northeast and southwest.Based on the above prediction indexes of shale gas favorable areas,the distribution of favorable areas is predicted in three cat-egories.The type I favorable area in the middle of Fuyan Xiaoya syncline is the preferred target area for shale gas exploration in the next step.
作者
辛云路
葛佳
李昭
金春爽
XIN Yunlu;GE Jia;LI Zhao;JIN Chunshuang(Oil&Gas Survey Center of China Geological Survey,Beijing 100083,China)
出处
《西北地质》
CAS
CSCD
北大核心
2023年第1期232-244,共13页
Northwestern Geology
基金
中国地质调查局项目“南方地区1∶5万页岩气基础地质调查填图试点”(DD20160182)资助成果。
关键词
黔北
宽阔-浮焉地区
五峰组
龙马溪组
页岩气有利区
地质调查工程
Northern Guizhou
Kuankuo-Fuyan area
Wufeng Formation
Longmaxi Formation
shale gas favorable area
geological survey engineering
作者简介
辛云路(1989−),男,工程师,博士,主要从事含油气盆地地质研究。E-mail:xinyunlu614@163.com。
