川中小潼场—白庙地区大安寨段储层研究

Daanzhai Member Reservoir of Xiaotongchang-Baimiao Area, Central Sichuan Basin

四川中部小潼场—白庙地区大安寨段油藏是典型的湖相碳酸盐岩裂缝型油气藏,属于特殊油气藏。通过深化该区的地质研究,有望找到相对有利的勘探开发接替区块。研究表明:大安寨段储层的储集岩类主要为质地较纯的介壳灰岩和含泥质介壳灰岩,储渗空间以构造成因的裂缝占绝对优势,次生孔隙较少,原生孔隙偶见;储层属于典型的特低孔、特低渗的裂缝型储层。在地质研究基础上结合地震裂缝预测,确定了小潼场鼻状突起的大石桥—中坝区块、李渡地区的蒋家湾—走马区块和白庙地区的石龙场—新场区块为区内研究层段的有利勘探区块。

Daanzhai Member of Xiaotongchang-Baimiao area, central Sichuan Basin, is a typical lacustrine carbonate fractured reservoir. Relatively favorable replaced tracts will be found out after a deep study on regional geology. Study results show that: (1)Daanzhai Member is mainly composed of pure coquinite and argillaceous coquinite;(2)reservoir space includes mainly tectonic fracture, partly secondary pore, and occasionally primary pore;(3) reservoir is typically fractured one with extra low permeability and porosity. Integrated geological study with seismic fracture forecast, three favorable blocks have been determined, such as Dashiqiao-Zhongba block in Xiaotongchang nosed bulge, Jiangjiawan-Zouma block in Lidu area and Shilongchang-Xinchang block in Baimiao area.