黔北地区中二叠统栖霞组油气显示及勘探前景  

Prospects of oil and gas displays and exploration of the Middle Permian Qixia Formation in the northern Guizhou

作　　者：罗茂会 牟雨亮 王甘露[1,2] 陈正山 石再平[4] 李信念 李源洪 LUO Maohui;MU Yuliang;WANG Ganlu;CHEN Zhengshan;SHI Zaiping;LI Xinnian;LI Yuanhong(College of Resource and Environmental Engineering,Guizhou University,Guiyang 550025,China;Petroleum Society of Guizhou Province,Guiyang 550025,China;No.117 Geological Team,Guizhou Bureau of Geological Mineral Exploration and Development,Guiyang 550018,China;The 3rd General Team of Guizhou Nonferrous Metals and Nuclear Industry Geological Survey Bureau,Zunyi 563000,China;No.106 Geological Party of Guizhou Bureau of Geological Mineral Exploration Development,Zunyi 563000,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州省石油学会,贵州贵阳550025 [3]贵州省地质矿产勘查开发局117地质大队,贵州贵阳550018 [4]贵州省有色金属和核工业地质勘查局三总队,贵州遵义563000 [5]贵州省地质矿产勘查开发局106地质大队,贵州遵义563000

出　　处：《天然气地球科学》2022年第5期742-754,共13页Natural Gas Geoscience

基　　金：贵州省科技厅计划项目(编号:黔科合支撑[2020]4Y037);贵州省地质勘查基金项目(编号:208-9912-JBN-L1D7)联合资助.

摘　　要：近年来,黔北地区多个向斜内中二叠统栖霞组灰岩—泥灰岩韵律层屡获天然气显示。为明确该层段在黔北地区是否具有天然气勘探前景,采用野外剖面测量、钻井岩心编录及实验分析测试等方法对黔北地区中二叠统栖霞组灰岩—泥灰岩韵律层的发育分布特征及有机地球化学特征进行研究。结果表明:黔北地区中二叠统栖霞组主要分布于各向斜内,全区呈“东薄西厚”趋势,厚度达100~210 m;其中栖霞组顶部的灰岩—泥灰岩韵律层厚度大,为40~60 m;泥灰岩层组分富含有机质,TOC平均含量为0.77%,成熟度适中,RO值分布在2.08%~2.56%之间,处于过成熟阶段,有机质类型佳,为Ⅰ型和Ⅱ型,与已获得天然气突破的川东南地区具有相似的特征,具有良好的天然气勘探潜力。结合研究区地质构造特征,划分出天然气勘探Ⅰ类有利区15个,Ⅱ类有利区7个,总面积达5 392.9 km^(2),未来可在这些有利区内勘探龙马溪组页岩气时兼探栖霞组灰岩—泥灰岩韵律层天然气。勘探开发一旦取得成功,将成为黔北及邻区继龙马溪组页岩气之后的又一具有广阔勘探前景的新层系。In recent years,the limestone-marl alternations of the Middle Permian Qixia Formation within several synclines in northern Guizhou have repeatedly shown natural gas. To clarify whether the formation has the prospect of natural gas exploration in the northern Guizhou,the developmental distribution characteristics,and organic geochemical characteristics of the limestone-marl alternations of the Middle Permian Qixia Formation in the northern Guizhou were investigated by using field profile measurements,drilling core compilation and experimental analysis tests. The results show that the Middle Permian Qixia Formation in northern Guizhou is mainly distributed in the core of each syncline,with a thickness of 100-210 m,and gradually thin from northwest to southeast. The thickness of the limestone-marl alternations at the top of the Qixia Formation is large of 40-60 m;the marl component in the limestone-marl alternations is rich in organic matter,with an average TOC content of 0.77%;its maturity is moderate,with ROin the range from 2.08% to 2.56%,which is in the over-mature stage,and the organic matter type is excellent,being Type Ⅰ and Ⅱ. It has similar characteristics with southeast Sichuan Basin where gas breakthrough has been achieved and has good potential for gas exploration. Combined with the geological and tectonic characteristics,the study area is divided into 15 favorable zones of gas exploration types Ⅰ and seven favorable zones of type Ⅱ,with a total area of 5392.9 km^(2). If the future exploration of Longmaxi Formation shale gas in these favorable areas is combined with the natural gas exploration in the limestone-marl alternations of Qixia Formation,once the exploration and development are successful,it will become another new layer system with broad exploration prospects after the Longmaxi Formation shale gas in northern Guizhou and its adjacent areas.

关 键 词：油气显示 非常规天然气 勘探潜力 灰岩—泥灰岩韵律层 栖霞组 黔北地区 

分 类 号：TE122.1[石油与天然气工程—油气勘探]