短語詞組短語density -logging 密度測井density y logging 密度測井azimuth density neutron logging tool 方位密度中子測井儀variable density logging 聲波變密度測井three detector density logging 三探測器密度測井lithology and density logging 巖性密度borehole gravity density logging 井下重力密度測井litho -density logging 巖性密度測井;密度測井neutron -density logging 中子密度測井 返回 density log