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Characteristics of dissolved inorganic carbon in produced water from coalbed methane wells and its geological significance

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Petroleum Exploration and Development 2020年第5期47卷 1074-1083页

作者： YANG Zhaobiao QIN Yong QIN Zonghao YI Tongsheng LI Cunlei ZHANG Zhengguang Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221008China School of Resource and Geosciences China University of Mining and TechnologyXuzhou 221116China Guizhou Research Center of Shale Gas and CBM Engineering Technology Guiyang 550009China

Based on long-term dynamic tracing of dissolved inorganic carbon(DIC)and stable carbon isotope(δ13CDIC)in produced water from 20 coalbed methane(CBM)wells in western Guizhou,the spatial-temporal dynamic variations ofδ13CDIC of the GP well group produced in multi-layer commingled manner were analyzed,and the relationship between the value ofδ13CDIC and CBM productivity was *** produced water samples of typical wells in the GP well group were amplified and sequenced using 16S rDNA,and a geological response model ofδ13CDIC in produced water from CBM wells with multi-coal seams was put *** research shows that:δ13CDIC in produced water from medium-rank coal seams commonly show positive anomalies,the produced water contains more than 15 species of methanogens,and Methanobacterium is the dominant *** dominant methanogens sequence numbers in the produced water are positively correlated withδ13CDIC,and the positive anomaly of v is caused by reduction of methanogens,and especially hydrogenotrophic *** segmentation of sedimentary facies and lithology in stratum with multi-coal seams will result in permeability and water cut segmentation,which will lead to the segmentation ofδ13CDIC and archaea community in produced water,so in the strata with better permeability and high water cut,theδ13CDIC of the produced water is abnormally enriched,and the dominant archaea is mainly *** the strata with weak permeability and low water cut,theδ13CDIC of the produced water is small,and the microbial action is *** shallow layer close to the coal seam outcrop is likely to be affected by meteoric precipitation,so theδ13CDIC of the produced water is *** geological response model ofδ13CDIC in produced water from multi-coal seams CBM wells in the medium-rank coal reveals the geological mechanism and microbial action mechanism of theδ13CDIC difference in the produced water from the multi-coal seams CBM *** also provides effect

关键词： coalbed methane produced water from coal seam dissolved inorganic carbon stable carbon isotope archaea community microbial gene CBM productivity geological response model

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