Characterization and origin of micropores in tight gas grainstones of the Lower Triassic Feixianguan Formation in the Jiannan gas field, Sichuan Basin
Characterization and origin of micropores in tight gas grainstones of the Lower Triassic Feixianguan Formation in the Jiannan gas field, Sichuan Basin
复制标题
四川盆地剑南气田下三叠统飞仙关组致密气颗粒岩微孔隙特征及成因
DOI：
10.1016/j.marpetgeo.2022.105609
复制
发表时间：
2022-03-01
影响因子：
4.2
通讯作者：
Li, Pingping
中科院分区：
文献类型：
--
作者：
Wang, Guangwei;Hao, Fang;Li, Pingping
油气藏中直径小于10 μ m的微孔由于其对油气评价和生产的重要影响，其经济价值在油气勘探中越来越受到重视。四川盆地建南气田下三叠统飞仙关组在过去40年中一直在产气，从致密颗粒砂岩储层中累计生产烃类气体近20亿m3。然而，一个复杂的问题是，几乎没有可见的孔隙在薄片上的岩相显微镜，导致在飞仙关灰岩的孔隙网络的成因和成岩演化的认识不足。所研究的储层主要由颗粒岩组成，氦孔隙度小于4%，平均为1.3%。对大约410个薄片的观察表明，所有的原生粒间大孔（直径> 10 μ m）都被压实和胶结作用完全破坏，少量的次生粒内大孔（大孔隙
Economic importance of micropores with diameter less than 10 mu m in petroleum reservoirs has attracted more and more attention in hydrocarbon exploration because of a significant influence on evaluation and production of hydrocarbons. The Lower Triassic Feixianguan Formation of the Jiannan gas field in the Sichuan basin has been gas productive over the last 40 years, producing a cumulative total of nearly two billion cubic meters of hydrocarbon gases from tight grainstone reservoirs. However, a complex problem is that there are nearly no visible pores in thin sections with a petrographic microscope, leading to the poorly understanding origin and diagenetic evolution of the pore network in the Feixianguan limestones. The studied reservoirs consist mainly of grainstones and have helium porosity less than 4% with an average of 1.3%. Observation from approximately 410 thin sections demonstrated that all primary interparticle macropores (diameter > 10 mu m) were totally destroyed by compaction and cementation, and minor amounts of secondary intraparticle macropores (macro-porosity