碳酸盐岩储集层复杂孔渗关系及影响因素——以滨里海盆地台地相为例  

Complex relationship between porosity and permeability of carbonate reservoirs and its controlling factors: A case of platform facies in Pre-Caspian Basin

作　　者：何伶[1,2] 赵伦[2] 李建新[2] 马纪 刘瑞林[1] 王淑琴[2] 赵文琪[2] 

机构地区：[1]长江大学地球物理与石油资源学院 [2]中国石油勘探开发研究院 [3]石油工业出版社石油科技分社

出　　处：《石油勘探与开发》2014年第2期206-214,共9页Petroleum Exploration and Development

基　　金：国家油气重大专项海外含盐盆地油气成藏规律与重点探区目标优选(2011ZX05029-002);中国石油天然气集团公司重大专项(2011E-2504)

摘　　要：以滨里海盆地东缘石炭系碳酸盐岩为例,在大量岩心分析资料基础上,研究碳酸盐岩储集层孔隙度、渗透率之间的复杂关系及其影响因素。滨里海盆地东缘石炭纪为开阔台地、局限台地、蒸发台地相碳酸盐岩沉积环境。白云岩储集层孔隙组合类型主要为:晶间孔-溶蚀孔、晶间微孔、晶间微孔-晶内孔,以晶间孔-溶蚀孔组合类型物性最好。灰岩储集层孔隙空间组合类型为:粒间孔、粒间孔-粒内孔、铸模孔,铸模孔缺少喉道连通,渗透性差。白云岩储集层裂缝、溶洞均较发育,对储集层渗透性改善显著。孔隙度相近情况下,各类储集层渗透率明显受大—中孔喉所占的比例和孔喉半径的控制。灰岩储集层裂缝以微裂缝为主,连通孔隙占总孔隙比例与渗透率呈正相关关系,而白云岩储集层二者没有明显的关系。沉积成岩环境控制储集层类型分布特征,是造成复杂孔渗关系的最根本的原因。Based on a large amount of core analysis data in eastern Pre-Caspian Basin, the relationship between permeability and porosity and its influencing factors are studied. The sedimentary environments of the Carboniferous System in eastern Pre-Caspian Basin include open platform, restricted platform and evaporate platform. For dolomite reservoirs there are three main combination patterns of pores, namely, inter-crystalline and solution pores, inter-crystalline micro-pores, inter-crystalline micro-pores and intra-crystalline pores, among which the first combination are highest in porosity and permeability. For limestone reservoirs, the main combinations of pores are inter-particle pores, inter-particle and intra-particle pores and moldic pores. Lacking connecting pore throats, moldic pores are poor in permeability. In the dolomite reservoirs, fractures and vugs are well-developed and increase the permeability significantly. Under similar porosity, the permeability is obviously determined by the size of pore throat and the percentage of middle to large size throats in different type of reservoirs. In limestone reservoirs, fractures are principally micro-fractures, percentage of connecting pores to total pores is positively correlated with permeability; while in dolomite reservoirs, there is not such an obvious relationship between the connected pore percentage and permeability. Sedimentary environment controlling the distribution features of reservoir types, is the cause of the complex relationship between permeability and porosity.

关 键 词：滨里海盆地 碳酸盐岩储集层 孔渗关系 储集空间组合 孔隙结构 

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