摘要
在岩石学特征的基础上,对川北地区中二叠统栖霞组不同类型白云岩储层进行分类,并进行储层特征分析和评价,结合地层、构造-沉积格局,分析白云岩储层的分布规律和主控因素,为四川盆地深层碳酸盐岩油气藏勘探开发提供地质依据。研究结果表明,川北地区栖霞组白云岩储层可分为孔洞型和孔隙型,孔洞型储层发育溶孔白云岩,孔隙型储层主要发育晶粒白云岩和残余白云岩;白云岩储集空间可分为溶孔/溶洞、粒间孔、晶间孔、溶缝4种类型;储层总体以低孔、低渗为主,局部发育低孔-高渗型储层;成岩作用类型有白云石化作用、溶蚀作用、破裂作用和充填作用。白云岩储层在栖霞组各层段均有发育,但无论是储层厚度、分布范围和连续性,栖霞组第二段均好于第一段;平面上,白云岩储层沿基底深大断裂两侧厚度递减、断续分布,受深大断裂控制,但同时还受颗粒滩相分布的影响,此外白云石化作用和有机质活动也是控制储层发育的主要因素。
On the basis of petrological characteristics,different types of dolomite reservoirs of Middle Permian Qixia Formation in northern Sichuan are classified and their reservoir characteristics are studied and evaluated.The distribution and main controlling factors of dolomite reservoir are analyzed in terms of stratigraphic,structure-sedimentary pattern so as to provide geological basis for the exploration and development of deep carbonate reservoirs in Sichuan Basin.The results show that the dolomite reservoirs of Qixia Formation in northern Sichuan can be divided into vuggy dolomite type and porous dolomite type.The former mainly develops dissolved pore dolomite,while the latter mainly develops grain dolomite and residual dolomite.Space in dolomite reservoir can be divided into four types:solution pores/caves,intergranular pores,intercrystal pores and solution fractures.The dolomite reservoir is mainly characterized by low porosity and low permeability,with locally low porosity and high permeability.Diagenesis in association with the dolomite reservoir includes dolomitization,dissolution,fracturing and filling.Dolomite reservoirs are developed in each member of Qixia Formation,but the second member of Qixia Formation is better than the first member in terms of reservoir thickness,distribution range and continuity.On the plane,the thickness of dolomite reservoir is not only controlled by basement deep and large faults,which leads to the intermittent distribution of dolomite reservoir along both sides of the deep and large faults,but also affected by the distribution of grain beach facies.In addition,dolomitization and organic matter activity are also the main factors controlling the development of Qixia Formation dolomite reservoir in northern Sichuan.
作者
翟常博
ZHAI Changbo(SINOPEC Petroleum Exploration and Production Research Institute, Beijing 102206, China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2022年第2期162-174,共13页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(41872115)。
关键词
四川盆地
栖霞组
白云岩储层
主控因素
Sichuan Basin
Qixia Formation
dolomite reservoir
main controlling factors
作者简介
翟常博(1979-),男,博士,高级工程师,从事石油天然气地质综合研究,E-mailzhaicb.syky@sinopec.com。
