1. Technology Center,China Petroleum Logging Co. Ltd.,Xi'an 710077,China 2. North China Branch,China Petroleum Logging Co. Ltd.,Renqiu 062550,China 3. North China Oilfield Branch,China Petroleum and Natural Gas Co. Ltd.,Renqiu 062550,China
Because of complex reservoir forming conditions,strong heterogeneity and indistinct regularity of conventional logging response,it's difficult to conduct exploration effectively in the carbonate reservoir.The effectiveness evaluation of fractured reservoir is the main problem in the exploration and development of deep oil and gas.Seismic survey is limited to identitying small scale fractures or faults because of low resolution,and it is difficult for conventional logging method to accurately evaluate the geological characteristics because of the shallow investigation depth.The dipole shear wave imaging technique has been developed in recent years,which can image borehole acoustic reflectors within the range of 20~30m based on low frequency of dipole shear wave.Monopole radial profiling of compressional slowness can be used to retrieve P-wave velocity variation in well bore within 1m,which can indicate the reversibility of the reservoir.The dipole shear wave imaging is a good way for finding the extension of the wellbore fractures and the concealed fractures near the well,and monopole radial profiling of compressional slowness can reflect the change of P-wave velocity near the wellbore.In a comprehensive way,the reservoir with such characteristics as well developed fractures,long extension of fractures or existence of concealed fractures near the well bore and remarkable variation of compressional slowness indicates great potential for reservoir reconstruction.This method was applied to processing several wells in Hexiwu Qianshan in Huabei Oilfield,and the results correspond well with the results of liquid production after the reservoir reconstruction,and hence the method is worthy of further popularization and application.
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