石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (3): 778-788.doi: 10.11743/ogg20230319
收稿日期:
2022-12-10
修回日期:
2023-03-20
出版日期:
2023-06-01
发布日期:
2023-06-05
第一作者简介:
冯动军(1976—),男,博士、高级工程师,非常规油气地质。E?mail: 基金项目:
Received:
2022-12-10
Revised:
2023-03-20
Online:
2023-06-01
Published:
2023-06-05
摘要:
川东南二叠系龙潭组海-陆过渡相沉积是一套潜在的页岩气勘探领域,但目前面临勘探方向不清等问题。综合岩石学、有机地球化学和储层地质学,基于X射线衍射、有机岩石学分析、氩离子抛光扫描电镜、氦气孔隙度测试和联测实验等,分析了川东南地区S1井等重点井龙潭组9个小层中泥页岩有机地化、储层和含气性及其纵向变化特征,优选了页岩气富集的有利层段。研究结果表明,川东南地区龙潭组海-陆过渡相泥页岩沉积厚度大(TOC>2 %的泥页岩累计厚度50.11 m)、黏土矿物含量高(平均值42.69 %),以煤层、炭质页岩、泥页岩、粉砂质泥岩、含灰/灰质泥岩和泥质灰岩为主。泥页岩TOC均值为4.63 %,孔隙度均值大于2.0 %,且都具有煤>炭质页岩>泥页岩>粉砂质泥岩>含灰/灰质泥岩的变化趋势。有机质类型以Ⅲ型为主,Ro平均为2.07 %,储层以黏土矿物孔和微裂缝为主。②—④小层、⑥小层和⑧小层的煤层和泥页岩组合具有“厚度大、有机质丰度高、孔隙度高和含气性好”的特征,是海-陆过渡相页岩气勘探的有利目标层段。
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