新场气田沙溪庙组气藏地层应力场测井分析

Log Analysis of Formation Stressfield in Shaximiao Formation Gas Reservoir.

川西致密碎屑岩沙溪庙组气藏是中石化集团主要的天然气生产基地。针对该气藏低渗低产的特点 ,介绍了利用声波、密度、全波列以及地层倾角测井资料计算地层应力参数的方法 ,选择Js21 、Js23 2 、Js24等主要储层做了地层应力参数三维空间展布 ,分析了其应力场空间变化规律 ,基本弄清了沙溪庙组气藏的地层应力场分布状态为沿北东 南西向为最小主应力方向的特征 。

Shaximiao formation gas reservoir in the compact clastic rocks of western Sichuan is one of Sino-PEC′s main natural gas production bases. According to the low permeability and production characteristics of this gas reservoir, stress parameters are calculated with sonic wave data, density data,full wave sonic data and dip log data. 3D spatial distribution of formation stresses in the main reservoirs Js 2 1?Js 2 32 and Js 2 4 is plotted, based on which its stress changes are analysed, therefore, making the stress field distributions in this gas reservoir more clear.Its NE-SW direction is the minimum main stress. These achievements are important in effectively and reasonably developing this gas reservoir.