大宁-吉县地区地应力场对高渗区的控制

Control of High Permeability Zone by Ground Stress Field in Daning-Jixian Area

地应力场是控制煤层气富集高产重要因素之一,研究地应力场与煤层渗透性的关系可以更好的指导煤层气的勘探。通过对地层倾角测井资料和大地电位监测分析井壁崩落得出大宁-吉县地区水平最大主应力方向;根据声波时差测井和电阻率曲线计算出最大主应力值。研究结果表明古驿-窑渠背斜轴部为最大主应力低值区,控制着煤层气的高渗区,也是该地区最有利的勘探区域。

Ground stress field is one of the impoortant factors that control enrichment and high production of coalbed methane. Study of the relationship between the crustal stress field and permeability of coal seams may give better guidance to exploration of coalbed methane. Based on the diplog data and analysis of sidewall collapse by monitoring the earth potential, the orientation of the horizontal maximum principal stress is obtained in Daning-Jixian area. Based on sonic differential time log and resistivity curve the maximum principal stress value is calculated. The results of the research indicate that the Guyi-Yaoju anticlinal axis part is a low value zone of the maximum principal stress which controls the high permeability zone of coalbed methane, and also the most favorable exploration zone in this area.