时间推移测井技术在红台-疙瘩台地区的应用

在红台-疙瘩台地区的低孔隙度、特低渗透率储层中难以用电性特征区分油气储层和水层,而泥浆侵入过程中的时间推移测井则有助于识别储层.浅侧向电阻率是在该地区用时间推移测井技术区分油气水层的首选项目,补偿中子测井次之,其它项目效果不明显.在使用盐水泥浆钻井的前提下,对于低孔隙度、特低渗透率储集层,后一次测井值与前一次测井值相比,油气层的浅侧向电阻率降低,补偿中子孔隙度增大,表现为"减阻侵入";而标准水层则表现为相反的"增阻侵入".在高孔隙度高渗透率储层不出现上述特征.给出了2口井的应用实例.该技术可提高孔隙度低渗透率储层的测井解释符合率.

The Application of Time-lapse Logging in Hongtai-Gedatai Region

It is difficult to distinguish oil/gas-and water-bearing bed with electrical characteristics of formations with low porosity and extra-low permeability in Hongtai-Gedatai Zone,nevertheless,the time-lapse logging in mud invasion process might be helpful to identify reservoir.The shallow laterolog is the preferred items to distinguish oil/gas/water bed with the time-lapse logging technology in the zone,and compensated neutron log is the secondary,while the others are not effective obviously.In precondition of drilling with salt mud for low porosity and extra-low permeability reservoir, comparison the later log with the foregoing log,the shallow laterolog resistivity decreases and the compensated neutron porosity increases,exhibits as so called "resistivity decreased invasion" in oil/gas formation.By contrast,it exhibits as "resistivity increased invasion" in water formation.There is not such exhibition in high porosity and high permeability formations.Two case histories are presented.The technology can improve interpretation accordant rate in low porosity and low permeability formations.