元坝地区长兴组岩石学与储集空间特征分析

The Petrology and Reservoir Space Characteristics of Changxing Formation in Yuanba Region

通过对元坝地区长兴组10口井的岩芯及岩石薄片观察和总结,识别出其岩石类型主要为微晶灰岩、生屑灰岩、礁灰岩、藻黏结灰岩、晶粒白云岩、生屑白云岩和生物礁白云岩等;该区孔隙型储集空间以晶间孔和晶间溶孔为主,溶洞以裂缝性溶洞和孔隙性溶洞为主。溶蚀孔洞是长兴组重要的储集空间类型。

Based on the observation and summary of 10 wells＇ cores and rock thin sections of Changxing Formation in Yuanba region, rock types and reservoir space are identified. The main rock types are microcrystalline limestone, bioclastic limestone, reef limestone, algal boundstone, crystalline dolostone, reef dolomite and bioclastic dolomite. The main porosity reservoir space is intercrystalline pore and intercrystalline dissolved pore, the main caves are frac- tured cave and porosity cave. Dissolved pore is the important reservoir space stype in Changxing Formation.