致密砂岩气藏难动用储量压裂效果综合评价

Comprehensive Evaluation of Fracturing Effect of Hard-to-Recover Reserves of Compact Sandstone Gas Pool

水力压裂是致密低渗气藏投产的必要方式。依据川西新场XS气藏地质特征、压裂及试井资料,进行了定性及灰关联分析,结果表明,压裂层段有效厚度、孔隙度及地应力特征是影响该气藏压裂效果的主要因素;根据试井解释理论,综合利用压裂前后的试井资料分析了试井曲线形态特征及地层参数变化,动态认识了压裂层段储渗特征,评价了川西新场XS气藏的压裂效果,为该气藏今后压裂选层、措施方案改进提供了依据。其研究方法对同类型气藏的科学管理开发具有一定的指导意义。

Hydraulic fracturing is necessary to produce low permeability reservoir. Based on the analysis of geology, fracture and well test of Xinchang XS gas reservoir in depression of west Sichuan Basin, it is concluded that effective thickness, porosity and the stress＇ strait of fracturing layers is the main factor affecting fracturing effect. Based on the interpretation theory of well test and the comprehensive use of pre-fracturing and post fracturing well test data, the porous flow of the fractured formation and the fractured results were analyzed dynamically. The results provide reference for fracturing formation selection and improvement of procedure.