Neutron and density logging responses to gas reservoir for well-balanced and under-balanced logging:Gas reservoirs of sandstone in a western China field  

作　　者：WU WenSheng1,XIAO LiZhi1 & ZHANG LongHai2 1 Resource & Information Department,China University of Petroleum,Beijing 102249,China 2 Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China 

出　　处：《Science China Earth Sciences》2008年第S2期201-206,共6页中国科学（地球科学英文版）

基　　金：Supported by the Major State Basic Research Development Program of China (973 Program) (Grant No.2006CB202306)

摘　　要：Studying the response differences between neutron and density logging of gas reservoir for well-balanced and under-balanced logging will be of significance in evaluation of gas reservoir under the under-balanced condition and application of logging data. With Monte Carlo simulation technique,the paper obtains the relationship between neutron and density logging measurement and borehole di-ameter,porosity or gas saturation for well-balanced and under-balanced logging. The conclusions show that the response trend of under-balanced logging to gas reservoirs agrees with that of well-balanced logging with small borehole,and under-balanced logging data can be used usually as well-balanced logging data. When borehole diameter is large,under-balanced logging data should be corrected for the influences of borehole.Studying the response differences between neutron and density logging of gas reservoir for well-balanced and under-balanced logging will be of significance in evaluation of gas reservoir under the under-balanced condition and application of logging data. With Monte Carlo simulation technique,the paper obtains the relationship between neutron and density logging measurement and borehole di-ameter,porosity or gas saturation for well-balanced and under-balanced logging. The conclusions show that the response trend of under-balanced logging to gas reservoirs agrees with that of well-balanced logging with small borehole,and under-balanced logging data can be used usually as well-balanced logging data. When borehole diameter is large,under-balanced logging data should be corrected for the influences of borehole.

关 键 词：under-balanced LOGGING density LOGGING NEUTRON LOGGING gas reservoir response 

分 类 号：P631.81[天文地球—地质矿产勘探]