确定气藏地质储量新方法  

A new method of determining original gas in-place

作　　者：刘道杰[1] 李世成[2] 田中敬[1] 丁显峰[1] 解庆阁[1] 殷建成[3] 

机构地区：[1]西南石油大学研究生部,四川成都610500 [2]中国石油大港油田第四采油厂,天津300280 [3]中国石油西南油气田分公司川东北气矿,四川达州635000

出　　处：《断块油气田》2011年第6期750-753,共4页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目"异常高压气井(藏)开发动态模拟及最优控制研究"(50874094);高等学校博士学科点专项科研基金"油气田开发动态预测预警及优化控制"(20095121110003)联合资助

摘　　要：气藏储量的准确预测是气藏开发动态分析的重要研究内容。在广义气藏物质平衡方程的基础上,通过分析视地层压力倒数(Z/p)与累计产气量(Gp(Z/p))的关系,推导了新的定容封闭气藏和水驱气藏物质平衡方程。对于定容封闭气藏,物质平衡方程中Z/p与Gp(Z/p)呈线性关系,利用直线的斜率(天然气地质储量倒数1/G)可确定定容封闭气藏地质储量;对于水驱气藏,物质平衡方程中Z/p,Gp(Z/p)和气藏外部水体水侵量(We)呈多元函数关系,通过多元线性回归可确定水驱气藏地质储量。实例应用证明,新推导的定容封闭气藏和水驱气藏物质平衡方程能够准确计算气藏原始地质储量,从而验证了该方法的实用性、有效性和准确性。该方法也为气藏动态分析提供了一种新思路。Accurate prediction of original gas in-place（OGIP） is an important content of dynamic analysis of gas reservoir development. Based on the generalized material balance principle of gas reservoir, the new material balance equations of constantvolume gas reservoir and water drive gas reservoir were derived by analyzing the relation between apparent formation pressure derivative and cumulative gas production（CGP）. Apparent formation pressure derivative and CGP present a linear relationship in material balance equation for eonstant-volume gas reservoir, where OGIP can be got from the slope（OGIP derivative l/G） of straight line. Apparent formation pressure derivative, CGP and water influx of water body outside gas reservoir indicate the multivariate function relationship for water drive gas reservoir, where OGIP could be achieved by multiple linear regression. The case study shows that the new material balance equation of constant-volume gas reservoir and water drive gas reservoir can accurately calculate OGIP, which proves the practicability and effectiveness of this method. It provides a new way for dynamic analysis of gas reservoir.

关 键 词：物质平衡方程 定容封闭气藏 水驱气藏 地质储量 天然水驱 动态分析 

分 类 号：TE155[石油与天然气工程—油气勘探]