应用测井资料聚焦海相页岩气甜点小层

Application of Log Data to Focus on Sweet Spots of Marine Shale Gas

页岩气储层甜点识别对于水平井巷道的选取和开发效果具有重要影响。应用测井资料提取储层地质评价关键参数TOC、孔隙度、含气量、脆性矿物含量和微细裂缝发育层段等,综合评价地质甜点小层;提取储层三轴应力大小、脆性指数、地层破裂压力等工程品质参数,综合评价有利于压裂改造的工程甜点小层。应用生产测井解释的产能差异和RST检测的压裂效果验证地质甜点和工程甜点,建立地质甜点和工程甜点叠合的甜点小层评价标准。该方法成功地解释了新区块深层页岩气井甜点小层,优选水平井箱体,多口井试油获高产,解释方法得到进一步验证。

The identification of sweet spots in shale gas reservoir has an important influence on the selection of horizontal well targets and development effect of horizontal wells.The key parameters of reservoir geological evaluation,such as TOC,porosity,gas content,brittle mineral content and micro-fracture development interval,are extracted from well logging data to comprehensively evaluate the geological sweet spots.And the engineering quality parameters such as triaxial stress,brittleness index and formation fracture pressure are extracted to comprehensively evaluate the sweet spots favorable for fracturing reconstruction.The productivity difference of production log interpretation and the fracturing effect of RST testing are applied to verify the geological sweet spots and engineering sweet spots,and the evaluation criteria of sweet spots superimposed by geological and engineering sweet spots are established.This method successfully interprets the sweet spots of deep shale gas wells in new blocks,optimizes the target of horizontal wells,and achieves high production by oil testing in several wells.This interpretation method has been further verified.