煤层气井产出水溶解无机碳特征及其地质意义

杨兆彪; 秦勇; 秦宗浩; 易同生; 李存磊; 张争光

doi:10.11698/PED.2020.05.14

石油勘探与开发 >

2020 , Vol. 47 >Issue 5: 1000 - 1008

DOI: https://doi.org/10.11698/PED.2020.05.14

油气田开发

煤层气井产出水溶解无机碳特征及其地质意义

杨兆彪 ,
秦勇 ,
秦宗浩 ,
易同生 ,
李存磊 ,
张争光

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1.中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州 221008;
2.中国矿业大学资源与地球科学学院,江苏徐州 221116;
3.贵州省煤层气页岩气工程技术研究中心,贵州贵阳 550009

杨兆彪(1980-),男,河北张家口人,博士,中国矿业大学资源学院副教授,主要从事煤层气开发地质方面的研究和教学工作。地址:江苏省徐州市大学路1号中国矿业大学南湖校区,中国矿业大学资源学院,邮政编码:221116。E-mail:zhaobiaoyang@163.com

收稿日期: 2019-10-09

修回日期: 2020-08-14

网络出版日期: 2020-09-22

基金资助

国家自然科学基金项目(41772155);国家科技重大专项“滇东黔西煤层气开发技术及先导性试验”(2016ZX05044-002)

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

YANG Zhaobiao ,
QIN Yong ,
QIN Zonghao ,
YI Tongsheng ,
LI Cunlei ,
ZHANG Zhengguang

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1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China;
2. School of Resource and Geosciences, China University of Mining and Technology, Xuzhou 221116, China;
3. Guizhou Research Center of Shale Gas and CBM Engineering Technology, Guiyang 550009, China

Received date: 2019-10-09

Revised date: 2020-08-14

Online published: 2020-09-22

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摘要

对贵州西部20口煤层气井产出水溶解无机碳(DIC)稳定碳同位素(δ¹³C_DIC)进行了长期动态跟踪,重点分析了多层合采煤层气GP井组δ¹³C_DIC的时空动态,探讨了δ¹³C_DIC值与煤层气产能的关系;选取典型井产出水进行了微生物16S rDNA扩增测序分析,提出了煤层气多层合采产出水δ¹³C_DIC地质响应模式。研究表明:中煤阶煤层气井产出水δ¹³C_DIC正异常普遍,产出水中包含15种以上的甲烷菌属,Methanobacterium为优势属;产出水中优势甲烷菌属序列数目与δ¹³C_DIC值显著正相关,δ¹³C_DIC值正异常由产甲烷菌还原作用造成,且主要为氢营养型甲烷菌还原作用;多煤层煤系沉积相及岩性的分段性会造成渗透性和富水性的分段性,从而控制产出水δ¹³C_DIC值和古菌群落的分段性,渗透性和富水性较好的层段,产出水δ¹³C_DIC值正异常显著,古菌属主要为Methanobacterium;渗透性和富水性较弱的层段,产出水δ¹³C_DIC值较小,微生物作用较弱;接近煤层露头的较浅部位,容易受到大气降水的补给,产出水δ¹³C_DIC值较小;中煤阶多煤层煤层气井产出水δ¹³C_DIC地质响应模式揭示了多层合采煤层气井产出水中δ¹³C_DIC差异的地质机理和微生物作用机理,为沉积相控制的叠置流体系统提供了有效的地球化学证据,也可用于多层合采煤层气井产层气、水贡献分析。图11表2参34

关键词： 煤层气; 煤层产出水; 溶解无机碳; 稳定碳同位素; 古菌群落; 微生物基因; 煤层气产能; 地质响应模式

本文引用格式

杨兆彪 , 秦勇 , 秦宗浩 , 易同生 , 李存磊 , 张争光 . 煤层气井产出水溶解无机碳特征及其地质意义[J]. 石油勘探与开发, 2020 , 47(5) : 1000 -1008 . DOI: 10.11698/PED.2020.05.14

Abstract

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.

Key words： 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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