天然气地球科学 ›› 2022, Vol. 33 ›› Issue (5): 742754.doi: 10.11764/j.issn.1672-1926.2022.01.012
罗茂会1,2(),牟雨亮1,2,王甘露1,2(),陈正山3,石再平4,李信念5,李源洪5
Maohui LUO1,2(),Yuliang MU1,2,Ganlu WANG1,2(),Zhengshan CHEN3,Zaiping SHI4,Xinnian LI5,Yuanhong LI5
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 km2,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。
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