四川盆地东部五百梯地区长兴组礁、滩相储层特征
网络出版日期: 2010-06-15
基金资助
国家自然科学基金项目(编号:40672073)和四川省博士后科研特别资助奖励项目“川东北地区长兴组一飞仙关组超压发育机制 与天然气藏勘探”
Characteristics of reef and shoal facies reservoir of Upper Permian Changxing Formation in Wubaiti area,eastern Sichuan Basin
Online published: 2010-06-15
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,整体上属裂缝一孔隙型低孔、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、中期中一深埋藏溶蚀作用、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。
张 涛 , 胡自多 , 刘文卿 , 鲁烈琴 , 邵喜春 . 四川盆地东部五百梯地区长兴组礁、滩相储层特征[J]. 岩性油气藏, 2010 , 22(2) : 24 -31 . DOI: 10.3969/j.issn.1673-8926.2010.02.005
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 caves supply the prominent reservoir space.Th e 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 favorab le microfacies for reservoir space. Diageneses including dolomitization and dissolution are primarily beneficial to the reservoir quality.Excellent reservoir is always associated th the multistage burial dolomitization,early dissolution,mi ddle dissolution at middle—anadiagenetic stage,late dissolution at anadiagenetic stage and hydrogen sulfuric acid dissolution related with TSR.
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