四川盆地东部五百梯地区长兴组礁、滩相储层特征  

Characteristics of reef and shoal facies reservoir of Upper Permian Changxing Formation in Wubaiti area,eastern Sichuan Basin

作　　者：文华国[1] 郑荣才[1] 党录瑞[2] 郑超[2] 赵灿[1] 王鹏飞 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室 [2]中国石油西南油气田分公司重庆气矿 [3]中国石油玉门油田分公司

出　　处：《岩性油气藏》2010年第2期24-31,共8页Lithologic Reservoirs

基　　金：国家自然科学基金项目(编号:40672073);四川省博士后科研特别资助奖励项目"川东北地区长兴组-飞仙关组超压发育机制与天然气藏勘探"

摘　　要：对川东五百梯地区上二叠统长兴组储层发育特征及成因的研究表明,该区长兴组储层储集空间以粒间溶孔、晶间溶孔、超大溶孔和溶洞为主,储集岩主要为颗粒白云岩、礁白云岩和晶粒白云岩,孔隙结构较差,整体上属裂缝-孔隙型低孔、中低渗储层;储层发育主要受沉积微相和成岩作用控制,其中受海侵背景影响的台缘礁、滩相带控制了储层的时空分布,礁坪浅滩、骨架礁和粘结礁为最有利储层发育的微相,白云石化和溶蚀作用对储层的改造至关重要,优质储层的形成是埋藏白云石化作用、早期溶蚀作用、中期中—深埋藏溶蚀作用、晚期深埋藏溶蚀作用以及与TSR有关的氢硫酸溶蚀作用多期叠加的结果。The characteristics and genesis of Changxing Formation reservoir in Wubaiti area are studied. The result indicates that intracrystalline pores, intercrystalline solution pores, super large dissolved pores and eaves supply the prominent reservoir space. The reservoir rocks are mainly grain dolomite, reef dolomite and crystal dolomite. The reservoir property is generally poor and it is attributed into fracture-pore reservoir with low porosity and medium permeability. The development of reservoir of Changxing Formation is generally controlled by microfacies and diagenesis. The reef and shoal facies of the platform edge which developed in the period of sustained transgression controlled the distribution of the reservoir. Reef platform shallows, framework reef and binding reef are favorable microfacies for reservoir space. Diageneses including dolomitization and dissolution are primarily beneficial to the reservoir quality. Excellent reservoir is always associated with the multistage burial dolomitization, early dissolution, middle dissolution at middle-anadiagenetic stage, late dissolution at anadiagenetic stage and hydrogen sulfuric acid dissolution related with TSR.

关 键 词：礁、滩相 储层特征 埋藏白云石化 溶蚀作用 上二叠统长兴组 四川盆地东部 

分 类 号：TE122.23[石油与天然气工程—油气勘探]