连续低频平面激波诱导的纯斯通利波渗透率测井方法与应用OA

Shock-tube core experiments have provided an important finding,that is,the low frequency acoustic field generated by planar shock waves can induce pure Stoneley waves in a borehole,with their amplitude attenuations demonstrating a definite correlation with fracture width and permeability.Accordingly,a method was proposed to transmit low frequency planar shock waves in a borehole through axially polarized axial vibration,thereby continuously inducing pure Stoneley waves.Equations were also derived for calculating fracture width and permeability from Stoneley wave amplitude attenuation.Moreover,the permeability logging prototype was successfully developed,together with acquisition and processing software incorporating amplitude-attenuation extraction and permeability calculation.The operability,stability,and measurement performance of the logging tool were tested and verified in two standard wells,R91 in the Bohai Bay Basin and LS2 in the Tarim Basin.In the 10 000-meter-deep well SDTK1 in the Tarim Basin,matrix and fracture permeability curves of extra-deep Cambrian carbonate formations were obtained in a single downhole logging.The results were immediately calibrated with the data of quasi-in-situ nuclear magnetic resonance(NMR)permeability measurement on full-diameter drilling cores taken from the same interval of the well.The results show that the proposed method performs well in quantitative permeability evaluation of extra-deep carbonate reservoirs and provides a new technical approach for permeability logging evaluation in other types of reservoirs.This theoretical and technological breakthrough provides an innovative means for quantitative permeability evaluation in reservoir logging.