川东三叠系飞四段滩相鲕粒灰岩储层

Beach-facies oolitic limestone reservoir in Member 4 of Triassic Feixianguan Formation in East Sichuan, China

根据对川东华蓥山地区陈家湾剖面地质调查,首次发现在飞四段存在滩相鲕粒灰岩地层。通过对该地层岩性、物性、孔隙类型、孔隙结构等特征研究,认为属于鲕粒滩相沉积,储集性能好。飞四段储层以溶孔为主,裂缝次之,属裂缝+溶孔型储层。飞四段滩相鲕粒灰岩储层的发现,为川东地区飞仙关组天然气的勘探提供了新的目的层。

According to the research of the geological section in the Huayingshan area in East Sichuan, for the first time, it was found beach-facies oolitic limestone layer was found existing in Member 4 of the Triassic Feixianguan Formation (T 1f^4). Through the research on strta features such as lithology, petrophysical property, pore type, pore structure, etc., the oolitic limestone layer was thought to belong to oolitic beach-facies sediments with good storage performance. The storage rooms of the reservoir rocks in T 1f^4 are mainly the solution cavities, and the fractures take second place, it belongs to the fracture-solution cavity reservoir.The discovery of beach-facies oolitic limestone reservoir in T 1f^4 offers a new exploration target zone for gas exploration in Feixianguan Formation in East Sichuan.