孤店断陷致密气储集层录井快速解释评价方法

Quick interpretation and evaluation method of mud logging for tight gas reservoirs in Gudian fault depression

松辽盆地南部孤店断陷致密气储集层横纵向含气性、物性变化大,且气测异常与产气量相关性差,造成该区储集层录井解释评价难度增大。通过系统分析该区含气性、物性参数响应特征,优选全烃校正值与钻时比值及孔隙度交会图板、气测显示有效厚度、烃源岩厚度、烃源岩地化评价、气测后效及全烃曲线形态综合解释评价方法,形成了该区致密气气水层录井配套解释系列,并开发了自动解释程序,解决了该区含气性认识不清和录井评价的难题。该方法在孤店断陷、德惠断陷等松辽盆地南部的致密气藏应用中效果明显,提高了致密气录井解释符合率,可为致密气储集层评价和压裂提供充分依据,不仅适用于致密气储集层,也适用于其他气层区。

The large changes in the horizontal and vertical gas bearing and physical properties along with the poor correlation between abnormal gas logging and gas yield of tight gas reservoirs in Gudian fault depression in southern Songliao Basin brought difficulties to mud logging interpretation and evaluation of reservoirs in this area.Through the systematical analysis of response characteristics of gas bearing and physical properties,and the optimization of crossplot chart of total hydrocarbon correction value,drilling time ratio and porosity,effective thickness of gas bearing shows,source rock thickness,geochemical evaluation of source rocks,and the comprehensive interpretation method of gas bearing aftereffect and total hydrocarbon curve shape,a supporting interpretation series for the mud logging of gas and water layers in the tight gas reservoirs in this area was formed,and an automatic interpretation program was developed,which solved the vague understanding of gas bearing and mud logging evaluation of the region.This method was effective in the application to tight gas reservoirs in southern Songliao Basin,such as Gudian fault depression and Dehui fault depression,and improved the interpretation coincidence rate of tight gas logging.With the applicability in tight gas reservoirs and other gas reservoirs,it provided sufficient basis for tight gas reservoir evaluation and fracturing.