Based on long-term dynamic tracing of dissolved inorganic carbon (DIC) and stable carbon isotope (δ¹³C_DIC) in produced water from 20 coalbed methane (CBM) wells in western Guizhou, the spatial-temporal dynamic variations of δ¹³C_DIC of the GP well group produced in multi-layer commingled manner were analyzed, and the relationship between the value of δ¹³C_DIC and CBM productivity was examined. The produced water samples of typical wells in the GP well group were amplified and sequenced using 16S rDNA, and a geological response model of δ¹³C_DIC in produced water from CBM wells with multi-coal seams was put forward. The research shows that: δ¹³C_DIC 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 genus. The dominant methanogens sequence numbers in the produced water are positively correlated with δ¹³C_DIC, and the positive anomaly of δ¹³C_DIC is caused by reduction of methanogens, and especially hydrogenotrophic methanogens. Vertical 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 of δ¹³C_DIC and archaea community in produced water, so in the strata with better permeability and high water cut, the δ¹³C_DIC of the produced water is abnormally enriched, and the dominant archaea is mainly Methanobacterium. In the strata with weak permeability and low water cut, the δ¹³C_DIC of the produced water is small, and the microbial action is weak. The shallow layer close to the coal seam outcrop is likely to be affected by meteoric precipitation, so the δ¹³C_DIC of the produced water is smaller. The geological response model of δ¹³C_DIC in produced water from multi-coal seams CBM wells in the medium-rank coal reveals the geological mechanism and microbial action mechanism of the δ¹³C_DIC difference in the produced water from the multi-coal seams CBM wells. It also provides effective geochemical evidence for the superimposed fluid system controlled by sedimentary facies, and can also be used for the contribution analysis of the produced gas and water by the multi-layer CBM wells.

基于长期动态溶解的无机碳（DIC）和稳定的碳同位素（追查δ ¹³ Ç _DIC从20煤层甲烷（CBM）在黔西孔中所产生的水），在空间-时间动态变化δ ¹³ C ^ _DIC在多层混合的方式制造的GP井组进行了分析，和的值之间的关系δ ¹³ ç _DIC检查和CBM生产率。在GP井组在典型的井的所产生的水样品进行扩增，并使用的16S rDNA，和地质响应模型测序δ ¹³ C ^ _DIC提出了多煤层煤层气井采出水的处理方法。研究表明：δ ¹³ C ^ _DIC来自中排名煤层产生的水通常表现出正异常，产生的水包含超过15种产甲烷菌，而甲烷是主要的属。在所产生的水的主要产甲烷菌序列号被正相关δ ¹³ Ç _DIC，和正异常的δ ¹³ C ^ _DIC是由产甲烷菌，特别是氢营养型产甲烷菌的减少引起的。在具有多煤层地层沉积相和岩性的垂直分割将导致渗透性和含水分割，这将导致的分割δ ¹³ Ç _DIC和在产生的水古细菌群落，所以具有更好的透气性和高的地层含水率，所述δ ¹³ ç _DIC所产生的水的异常富集，占主导地位的古细菌主要是甲烷。在具有弱渗透性和低含水地层中，δ ¹³ C ^ _DIC采出水量少，微生物作用弱。浅层靠近煤层露头很可能是由大气降水的影响，因此将δ ¹³ Ç _DIC所产生的水的更小。的地质响应模型δ ¹³ Ç _DIC中产生的水从多煤层煤层气井在中等等级煤揭示的地质机构和微生物作用机制δ ¹³ C ^ _DIC多煤层煤层气井采出水的差异。它也为由沉积相控制的叠加流体系统提供了有效的地球化学证据，也可以用于多层煤层气井对产出气和水的贡献分析。