沁水盆地郑庄区块煤层气井产出水化学成分演变及其高产响应

doi:10.7623/syxb202411006

石油学报 ›› 2024, Vol. 45 ›› Issue (11): 1638-1651.DOI: 10.7623/syxb202411006

• 地质勘探 • 上一篇

沁水盆地郑庄区块煤层气井产出水化学成分演变及其高产响应

王勃¹, 徐凤银², 金雪^3,4, 王立龙⁵, 屈争辉^3,4, 张文胜⁵, 李志¹, 刘国伟⁵, 张艺腾¹, 史鸣剑¹

1. 应急管理部信息研究院北京 100029;
2. 中国石油学会北京 100724;
3. 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;
4. 中国矿业大学资源与地球科学学院江苏徐州 221116;
5. 中国石油华北油田公司山西煤层气勘探开发分公司山西长治 046000

收稿日期:2024-04-09 修回日期:2024-08-05 发布日期:2024-12-03
作者简介:王勃,男,1979年10月生,2013年获中国矿业大学博士学位,现为应急管理部信息研究院正高级工程师,主要从事煤层气、致密砂岩气勘探开发及瓦斯防治方面研究工作。Email:wangbo1230038@163.com
基金资助:
国家自然科学基金项目(No.41872179)资助。

Evolution of chemical components in produced water from coalbed methane wells in Zhengzhuang block of Q inshui Basin and its response to high productivity

Wang Bo¹, Xu Fengyin², Jin Xue^3,4, Wang Lilong⁵, Qu Zhenghui^3,4, Zhang Wensheng⁵, Li Zhi¹, Liu Guowei⁵, Zhang Yiteng¹, Shi Mingjian¹

1. Information Research Institute, Ministry of Emergency Management, Beijing 100029, China;
2. Chinese Petroleum Society, Beijing 100724, China;
3. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Processes, Ministry of Education, China University of Mining and Technology, Jiangsu Xuzhou 221008, China;
4. School of Resources and Earth Sciences, China University of Mining and Technology, Jiangsu Xuzhou 221116, China;
5. Shanxi CBM Exploration and Development Branch Company, PetroChina Huabei Oilfield Company, Shanxi Changzhi 046000, China

Received:2024-04-09 Revised:2024-08-05 Published:2024-12-03

摘要/Abstract

摘要： 煤层气井产出水的化学成分变化对煤层气高产具有重要的指示作用。以沁水盆地郑庄区块进入稳定排采阶段的煤层气直井产出水为研究对象,长期跟踪采样与测试,开展矿化度和主要离子特征分析,探讨产出水的化学特征及其对煤层气井高产的响应机制,取得了一些对生产实践具有参考价值的认识:①在煤层气井进入稳产阶段后,产出水的矿化度为2 000~3 000 mg/L,化学类型主要为Na-HCO₃型,反映出具有较好的水文地质封闭环境;②在排采过程中,由于郑庄区块的矿化度中心迁移,引起各采区产出水的矿化度以及Na⁺+K⁺和HCO₃^-等主要组成离子含量随排采时间的推进总体呈不同幅度的"W"型,其中,郑1采区、郑3采区、郑4采区和东采区矿化度的波动幅度相比于区块的平均矿化度分别表现出增大、减小、先小后大和先大后小的特征;③随着排采的推进,在相对高产的郑3采区和郑4采区,Ca²⁺、Cl^-含量分别与气水比呈正、负线性相关关系,且郑3采区的变化率明显高于郑4采区,而在其他采区,相关性则不明显;④构建了两种煤层气高产的产出水地球化学特征响应模式,即随产气效率增加,煤层中水溶CO₂的增加促进了方解石脉的溶解,致使Ca²⁺富集,而水化的Cl^-通过煤中的极性含氮官能团与显微组分反应可增加形成有机配合物的机率,致使Cl^-消耗。

关键词: 煤层气井, 产出水, 化学特征, 矿化度, 主要离子, Ca²⁺富集, Cl^-消耗

Abstract: The chemical characteristics of produced water from coalbed methane (CBM)wells are critical indicators of high productivity. This study targets at the produced water from vertical CBM wells in the Zhengzhuang block of Qinshui Basin, which have entered a stable drainage and production phase. Long-term sampling and testing were conducted to analyze the salinity and major ion characteristics of produced water, and then explore chemical features and response mechanisms of produced water to high CBM productivity, thus providing valuable insights for production practices. (1)After entering the stable production stage, the produced water from CBM wells has the salinity ranging between 2 000 mg/L and 3 000 mg/L, and is mainly of Na-HCO₃ type, reflecting a well-sealed hydrogeological environment. (2)During the drainage and production process, the migration of salinity centers in the Zhengzhuang block led to the W-shaped variation in the salinity and the main ionic components, such as Na⁺+K⁺ and HCO₃^-, across different production areas. Specifically, the salinity fluctuation amplitude in the Zheng1, Zheng3, Zheng4, and Dong production areas shows the characteristics of increasing, decreasing, becoming smaller and then larger, and larger and then smaller, respectively, as compared with the average salinity of the block. (3)In the relatively high-yield Zheng3 and Zheng4 production areas, the contents of Ca²⁺ and Cl^- show positive and negative correlations with the gas-water ratio over time, respectively. The change rate in Zheng 3 production area is significantly higher than that in Zheng 4 production area, while other areas show no significant correlation. (4)Two response models of chemical characteristics to high productivity in CBM wells are proposed for the produced water. As gas production efficiency increases, more CO₂ dissolved in water promotes the dissolution of calcite veins, leading to a Ca²⁺ enrichment; hydrated Cl^- reacts with maceral components in the coal via polar nitrogenous functional groups, which can increase the likelihood of forming organic complexes, leading to a Cl^- consumption.

Key words: coalbed methane wells, produced water, chemical characteristics, salinity, major ions, Ca²⁺ enrichment, Cl^-consumption

中图分类号:

TE133

王勃, 徐凤银, 金雪, 王立龙, 屈争辉, 张文胜, 李志, 刘国伟, 张艺腾, 史鸣剑. 沁水盆地郑庄区块煤层气井产出水化学成分演变及其高产响应[J]. 石油学报, 2024, 45(11): 1638-1651.

Wang Bo, Xu Fengyin, Jin Xue, Wang Lilong, Qu Zhenghui, Zhang Wensheng, Li Zhi, Liu Guowei, Zhang Yiteng, Shi Mingjian. Evolution of chemical components in produced water from coalbed methane wells in Zhengzhuang block of Q inshui Basin and its response to high productivity[J]. Acta Petrolei Sinica, 2024, 45(11): 1638-1651.

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沁水盆地郑庄区块煤层气井产出水化学成分演变及其高产响应

Evolution of chemical components in produced water from coalbed methane wells in Zhengzhuang block of Q inshui Basin and its response to high productivity

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