EH-4低频模式在楚雄盆地页岩气地质调查中的试验效果
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摘要
页岩气常分布于泥岩、页岩及粉砂岩类夹层中,储气层相对于围岩电阻率普遍较低,故寻找低阻层可指示泥、页岩层位分布.云南楚雄地区1∶5万页岩气地质调查中安排了音频大地电磁(AMT)剖面测量,使用EH-4低频模式(0.1~1 000 Hz)进行数据采集,经剖面视电阻率反演,结合2001年云参1井地层柱状图,对AMT反演电阻率剖面进行了地电断面划分,研究了剖面内地下电性结构、各构造单元地质构造、断裂,及调查区与页岩气有关的上三叠统舍资组、下寒武统筇竹寺组富有机质层中心起伏变化和盆地内部构造,为页岩气地质调查提供基础资料,对后期综合研究取得了较好的试验效果.
Shale gas is often distributed in interlayer between mudstone,shale and siltstone,The resistivity of gas reservoir is relatively lower than surrounding rock,so finding low resistivity layers can be effectively trace the distribution mudstone and shale.Based on the application of ATM profile measurement for 1 ∶ 50 000 shale gas geological surveys at Chuxiong area,Yunnan,this work collected data through the EH-4 low frequency models.Combined apparent resistivity inversion of profile with stratigraphic histogram of Yun 1 well,the author divided geo-electric section for AMT inversion resistivity profile and research underground electrical structure,geological formation,and discuss internal structure of basin and variety of rock related shale gas bearing organic matter in the upper Triassic series Shezi formation and the lower Cambrian Qiongzhusi formation in survey area.The results provide basic data for geological investigation of shale gas,and good test effect has been achieved for the later comprehensive research.
Shale gas is often distributed in interlayer between mudstone,shale and siltstone,The resistivity of gas reservoir is relatively lower than surrounding rock,so finding low resistivity layers can be effectively trace the distribution mudstone and shale.Based on the application of ATM profile measurement for 1 ∶ 50 000 shale gas geological surveys at Chuxiong area,Yunnan,this work collected data through the EH-4 low frequency models.Combined apparent resistivity inversion of profile with stratigraphic histogram of Yun 1 well,the author divided geo-electric section for AMT inversion resistivity profile and research underground electrical structure,geological formation,and discuss internal structure of basin and variety of rock related shale gas bearing organic matter in the upper Triassic series Shezi formation and the lower Cambrian Qiongzhusi formation in survey area.The results provide basic data for geological investigation of shale gas,and good test effect has been achieved for the later comprehensive research.
引文
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