摘要
低渗碳酸盐岩油藏是中国石油在海外开发的重要油藏类型,该油藏储层微观孔喉结构复杂,与低渗砂岩油藏有明显的差异,急需进行低渗碳酸盐岩油藏储层评价方面的研究工作。在550块低渗碳酸盐岩岩芯测试的基础上,提出了用主流喉道半径、启动压力梯度、可动流体百分数和原油黏度4个参数作为低渗碳酸盐岩油藏储层评价参数。研究表明:不同渗透率的低渗碳酸盐岩岩芯,其喉道半径分布差异显著,全直径岩样的气测渗透率和可动流体百分数有较好的半对数关系;且在相同渗透率条件下,低渗碳酸盐岩岩芯中大部分的喉道半径要比低渗砂岩岩芯小,而可动流体百分数要大于低渗砂岩油藏的可动流体百分数,这与低渗碳酸盐岩储层特点相一致。在此基础上,提出了低渗碳酸盐岩油藏四元分综合分类系数,建立了低渗碳酸盐岩油藏储层综合评价方法。
The low permeability carbonate reservoir is an important oil reservoir type developed overseas by PetroChina. Due to the complex structures of microscopic pore-throat and apparent differences with low permeability sandstone reservoir, it is necessary to research on the evaluation method of the low permeability carbonate reservoirs. Based on the test of 550 low permeability carbonate cores, the mainstream throat radius, the movable fluid percentage, the threshold gradient and the crude oil viscosity are determined to be the four paramenters to evaluate the low permeability carbonate reservoir. The research shows that the throat radius changes largely at the low permeability carbonate cores with different permeability and the full diameter cores＇ gas permeability has a semi-logarithmic relationship with the percentage of movable fluid. Besides, under the condition of same permeability, most throat radius of low permeability carbonate cores is smaller than that of low permeability sandstone, while the movable fluid percentage of carbonate is larger than that of sandstone which is in agreement with the reservoir property. Based on the results, four-factor classification of low permeability carbonate reservoir is put forward and the comprehensive evaluation method is hence introduced, which is successfully applied to the evaluation of the layers in a typical low permeability carbonate reservoir overseas.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第1期68-75,共8页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项(2011ZX05013-006)
中国石油重点科技攻关项目(2014B-1203)
关键词
低渗碳酸盐岩油藏
储层评价
喉道
可动流体
启动压力梯度
low permeability carbonate oil reservoir
reservoir evaluation
throat
movable fluid
threshold gradient
作者简介
通信作者：杨正明，E-mail：yzhm69@petrochina．com．cn杨正明，1969年生，男，汉族，江苏盐城人，高级工程师，博士，主要从事低渗／致密油藏储层评价、非线性数值模拟及渗流理论方面的研究。E-mail：yzhm69@petrochina．com．cn
蒋帅，1990年生，男，汉族，山东东营人，硕士研究生，主要从事低渗透油气储层评价研究。E—mail：chianshuai@qq．com
张亚蒲，1981年生，女，汉族，河北保定人，工程师，硕士，主要从事油气藏储层评价研究。E-mail：zhangyapu69@petrochina．com．cn
朱光亚，1975年生，男，汉族，高级工程师，博士，主要从事海外碳酸盐岩油气田开发研究。E-mail：cnzgy@163．com
郭和坤．1968年生，男，汉族，江苏如皋人，高级工程师，主要从事油气层物理实验研究。E—mail：nmrghk69@petrochina．com．cn
