西昌盆地上奥陶统五峰组—下志留统龙马溪组优质页岩层序沉积特征及页岩气聚集模式

doi:10.3969/j.issn.1672-7703.2022.05.009

摘要/Abstract

摘要： 西昌盆地多口钻井于上奥陶统五峰组—下志留统龙马溪组获得页岩气显示，其中，五峰组—龙马溪组一段（龙一段）的含气量较好，表明该层段具有良好的页岩气勘探开发潜力。为进一步做好西昌盆地龙一段的前期评价工作，综合利用岩心观察、岩心样品薄片等资料，结合测井解释，对优质页岩进行划分并对优质页岩的地层层序、沉积相、沉积模式等进行了研究。结果表明：（1）西昌盆地五峰组—龙马溪组优质页岩为①—⑤小层；（2）优质页岩可划分为两个三级层序，SQ1发育潮坪相中的生屑滩微相及深水陆棚相中的硅质泥棚微相，SQ2发育深水陆棚相中的灰质泥棚和含灰粉砂质泥棚；（3）五峰组—龙一1亚段为深水陆棚沉积，该沉积环境控制了优质页岩的发育，优质页岩有机碳含量高、硅质含量高、富含笔石；（4）断裂带发育程度、优质页岩埋深、优质页岩距断裂带的远近是影响西昌盆地五峰组—龙马溪组优质页岩层段页岩气聚集的关键因素。

关键词: 西昌盆地, 五峰组—龙马溪组, 优质页岩, 地层层序, 沉积相, 沉积模式, 页岩气聚集模式

Abstract: Shale gas shows have been observed from the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation in several wells in Xichang Basin. The drilling results indicate that gas content of Wufeng Formation-first member of Longmaxi Formation (Long 1 member) is relatively good, showing promising potential for shale gas exploration and development. By comprehensively applying core observation and thin section data, and integrating with logging interpretation, the high-quality shale is classified and the stratigraphic sequence,sedimentary facies and depositional pattern are studied, so as to primarily evaluate shale gas potential of Long 1 member in Xichang Basin.The study results show that: (1) The high-quality shale of Wufeng-Longmaxi Formation is composed of five thin layers ① - ⑤ ; (2) The highquality shale is divided into two third order sequences. Deposits of bioclastic beach microfacies of tidal flat facies and siliceous mud shelf microfacies of deep-water shelf facies were developed in SQ1, while SQ2 was composed of lime mud shelf and limy sandy mud shelf deposits of deep-water shelf facies; (3) The development of high-quality shale was controlled by the deep-water shelf environment during the deposition period of Wufeng-first sub member of the first member of Longmaxi Formation (Long 1₁ sub member), which had high organic carbon content,high silica content and rich graptolite; (4) The shale gas accumulation in high-quality shale of Wufeng-Longmaxi Formation is affected by three key factors, i.e., development degree of fault zone, burial depth of high-quality shale and distance between the high-quality shale to fault zone.

中图分类号:

TE122.1

何伟, 牟必鑫, 陈杨, 李桃, 魏洪刚, 玉雪, 于璐, 董雪洁. 西昌盆地上奥陶统五峰组—下志留统龙马溪组优质页岩层序沉积特征及页岩气聚集模式[J]. 中国石油勘探, 2022, 27(5): 96-105.

He Wei, Mu Bixin, Chen Yang, Li Tao, Wei Honggang, Lei Yuxue, Yu Lu, Dong Xuejie. Sedimentary sequence characteristics and shale gas accumulation pattern of high-quality shale in the Upper Ordovician Wufeng Formation-Lower Silurian Longmaxi Formation, Xichang Basin[J]. China Petroleum Exploration, 2022, 27(5): 96-105.

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