异常高压气藏岩石应力敏感性实验与模型研究  

EXPERIMENT AND MODEL OF ROCK STRESS SENSITIVITY FOR ABNORMAL HIGH PRESSURE GAS RESERVOIRS

作　　者：杨胜来[1] 王小强[2] 汪德刚[2] 蒋利平[1] 

机构地区：[1]石油大学 [2]中国石油塔里木油田分公司

出　　处：《天然气工业》2005年第2期107-109,共3页Natural Gas Industry

基　　金："十五"国家重点科技攻关课题2001BA605A02 02 03资助

摘　　要：为了搞清异常高压气藏岩石渗透率应力敏感特性,通过克拉 2 气田的岩心渗透率应力敏感性实验,得到了不同物性岩样的渗透率随有效覆压变化的规律,建立了以地面条件下空气渗透率为基准的不同有效覆压下渗透率的模型———幂函数模型,获得该气藏岩石空气渗透率与应力敏感性系数的关系式。该模型简单实用,其中应力敏感性系数的大小与岩石物性有关;该关系式克服了前人根据岩石物性范围分组表示岩石应力敏感性而导致不连续的缺点。实测结果还表明:克拉2气藏岩样应力敏感性高于大庆油田气藏的岩样,具有异常高压气藏岩石应力敏感性强的特点。To understand the rock stress sensitivity for abnormal high-pressure gas reservoirs, with the stress sensitivity experiments of core permeability in Kela-2 gas field, it is obtained the permeability variation law of the core samples with different physical property as the effective burden pressure changes. And taking the air permeability under the atmospheric conditions as the benchmark, the permeability model under different effective burden pressure (the power function model) is set up. The relational expression between the air permeability and the stress sensitivity coefficient of the gas reservoir rock is achieved. The model is simple and practical. Its stress sensitivity coefficient is related with the rock physical property. The expression overcomes the disadvantage of discontinuity caused by grouping the rock physical property to express the rock stress sensitivity in the past. Also, the experimental results show the stress sensitivity of the core samples from Kela-2 gas reservoir is higher than that from Daqing oil field. The Kela-2 gas reservoir has the characteristics of strong stress sensitivity that the abnormal high-pressure gas reservoirs have.

关 键 词：异常高压气藏 应力敏感性 岩石应力 空气渗透率 敏感性实验 岩石物性 克拉2气田 克拉2气藏 岩样 岩心 

分 类 号：P618.13[天文地球—矿床学]