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.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
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)
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
Pre-Caspian Basin
carbonate reservoir
permeability-porosity relationship
pores combination pattern
pore structure
作者简介
第一作者简介：何伶（1969-），女，四川西充人，中国石油勘探开发研究院高级工程师，主要从事海外油气田测井参数综合解释和储集层评价工作。地址：北京市海淀区学院路20号，中国石油勘探开发研究院中亚俄罗斯研究所，邮政编码：100083。E-mail：heling2@petrochina．com．cn
