川西南周公山及邻区下二叠统碳酸盐岩成岩作用对储集性的影响  

INFLUENCE OF DIAGENESIS OF LOWER PERMIAN CARBONATE ON RESERVIOR PERFORMANCE IN ZHOUGONGSHAN AND THE NEAR DISTRICTS IN THE SOUTHWEST SICHUAN

作　　者：冯仁蔚[1] 王兴志[1] 张帆[1] 庞艳君[1] 

机构地区：[1]西南石油大学资源与环境学院,成都610500

出　　处：《地质找矿论丛》2008年第3期223-229,共7页Contributions to Geology and Mineral Resources Research

基　　金：西南油气田分公司项目<川西南部地区加里东古隆起含油气远景目标研究>子课题中部分研究成果(编号:XNS05JS2004-55)

摘　　要：川西南周公山及邻区下二叠统的中-低孔、中-低渗碳酸盐岩储层的储集空间以次生成因的溶孔、溶洞和构造裂缝为主。研究认为,多世代方解石胶结、化学充填作用以及埋藏期的压实(溶)作用是孔隙很难得到保存的主要原因;同生-准同生期的混合水云化作用和表生期、埋藏期的流体溶蚀作用则产生了大量的次生溶孔、洞,使储层的孔渗性得到明显的改善;构造破裂作用可以产生新的储集空间,还影响各储集体之间及单一储集体内部空隙的连通。成岩相分为混合水云化-溶蚀-破裂相、溶蚀-胶结相和胶结-压实-压溶相。各种成岩作用的叠加形成了现今下二叠统油气储层的分布格局。Zhougongshan district and the neighboring area in southwest Sichuan province are dominated by medium-low porosity and medium-low permeability reserviors and reservior spaces. The research shows that the pore of the carbonate was mainly disappeared by multiple generation＇s calcite cementation and chemically filling and compaction （solusion） during bury. A large volume of secondary pore, cave resulted from admixed sea water dolomitzation of supergene and fluid corrosion during bury improve porosity and permeability of the reserviors. Tectonic fracturing gave rise to new reservior spaces and improves connection of inter and intra reserviors. Diagenesis is divided into admixed seawater dolomitization fluid corrosion-fracturing phase, fluid corrosion-cementing phase and cementing-compaction-compaction solution phase. The Lower permian oil-gas reservior distribution is configured by overprinting of the above mentioned diagenetic processes.

关 键 词：下二叠统 碳酸盐岩 成岩作用 储集性 川西南 

分 类 号：P588.2[天文地球—岩石学]