五里堠井田不同构造部位煤层气储层物性及产气差异研究

  • 王瑞 ,
  • 谭学斌 ,
  • 陈瑞杰 ,
  • 韩勇
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  • 1.山西潞安金源煤层气开发有限责任公司,山西 长治 046204;
    2.河南理工大学能源科学与工程学院,河南 焦作 454000
王瑞(1987—),男,本科,高级工程师,从事煤层气开发与开采工作。地址:山西省长治市襄垣县侯堡镇金源煤层气公司, 邮政编码:046204。E-mail: 365637153@qq.com
谭学斌(1997—),男,在读博士研究生,从事煤系气开发研究工作。地址:河南省焦作市世纪大道2001号河南理工大学,邮政编码:454000。E-mail: c.b_txb@foxmail.com

收稿日期: 2025-01-07

  网络出版日期: 2025-11-14

基金资助

河南省高校科技创新团队项目“煤系气储层物性定量表征与评价”(21IRTSTHN007)

Study on physical properties and gas production differences of coalbed methane reservoirs in different structural locations of Wulihou mine field

  • WANG RUI ,
  • TAN XUEBIN ,
  • CHEN RUIJIE ,
  • HAN YONG
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  • 1. Shanxi Lu’an Jinyuan Coalbed Methane Development Co., Ltd., Changzhi, Shanxi 046204, China;
    2. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China

Received date: 2025-01-07

  Online published: 2025-11-14

摘要

查明不同构造部位煤储层物性及产气差异,可为煤层气合层开发提供重要依据。以五里堠井田20口煤层气合采井为例,基于目标开发层位(3号+4号煤层和15号煤层)的煤层底板行迹和构造曲率,划分了构造组合类型。结合已有勘探资料,系统对比了不同构造部位煤储层的显微组分、吸附特性、煤体结构、含气特性与渗透率等关键物性参数差异,并分析了典型合采井的产气特征(排采曲线特征)。结果表明:①研究区煤储层构造组合可划分为7种类型:背斜-背斜型、背斜-平缓型、向斜-向斜型、向斜-平缓型、平缓-平缓型、平缓-背斜型和平缓-向斜型。②查明了研究区目标煤层(3号+4号煤层和15号煤层)在不同构造位置的显微组分、吸附特性、煤体结构、含气量和渗透率的物性差异。储层变形程度与灰分含量、Langmuir体积和煤体结构特征均有较强相关性。3号+4号煤层和15号煤层的构造曲率差值与含气量差值呈负相关,含气量变化范围较小;而与渗透率差值呈正相关,渗透率变化显著。不同构造组合类型的煤层含气量差值(单位:m3/t)依次为:平缓-背斜型(1.55)>平缓-向斜型(1.42)>背斜-平缓型(1.41)>平缓-平缓型(1.32)>向斜-平缓型(1.06)>向斜-向斜型(0.77)>背斜-背斜型(0.58);渗透率差值(单位:10⁻³ μm²)依次为:背斜-平缓型(0.24)>向斜-平缓型(0.21)>平缓-向斜型(0.19)=背斜-背斜型(0.19)>向斜-向斜型(0.17)>平缓-平缓型(0.16)>平缓-背斜型(0.11)。③对比不同构造部位合采井产气特征:背斜-背斜型、背斜-平缓型产气效果较好,产气峰值普遍超过1 000 m3/d;平缓-平缓型、平缓-背斜型和平缓-向斜型产气波动性较大,峰值介于200~1 200 m3/d;向斜-向斜型、向斜-平缓型产气表现较差,峰值仅约200~500 m3/d。

本文引用格式

王瑞 , 谭学斌 , 陈瑞杰 , 韩勇 . 五里堠井田不同构造部位煤层气储层物性及产气差异研究[J]. 油气藏评价与开发, 0 : 2025014 -2025014 . DOI: 10.13809/j.cnki.cn32-1825/te.2025014

Abstract

Identifying the differences in physical properties and gas production of coal reservoirs at different structural locations provides an important basis for the co-development of coalbed methane (CBM). Taking 20 CBM co-production wells in the Wulihou mine field as an example, the structural combination types of reservoirs were classified based on seam floor traces and structural curvature of the target development layers (No.3 + No.4 coal seams and No.15 coal seam). Combined with existing exploration data, the study compared key physical parameters of reservoirs at different structural locations, such as maceral components, adsorption characteristics, coal structure, gas-bearing characteristics, and permeability, and analyzed the drainage and production curve characteristics of typical co-production wells. The results indicated that: (1) the structural combination of coal reservoirs in the study area could be classified into seven types: anticline-anticline, anticline-gentle, syncline-syncline, syncline-gentle, gentle-gentle, gentle-anticline, and gentle-syncline. (2) The differences in maceral components, adsorption characteristics, coal structure, gas-bearing characteristics, and permeability were identified between the No.3 + No.4 coal seams and the No.15 coal seam at different structural locations. The degree of reservoir deformation was strongly correlated with ash content, Langmuir volume, and coal structure. The difference in structural curvature between the No.3 + No.4 and No.15 coal seams was negatively correlated with the difference in gas content, with a relatively small range of gas content variation, but was positively correlated with the difference in permeability, which changed significantly. The differences in gas content (unit: m³/t) across different structural combination types followed the order: gentle-anticline (1.55) > gentle-syncline (1.42) > anticline-gentle (1.41) > gentle-gentle (1.32) > syncline-gentle (1.06) > syncline-syncline (0.77) > anticline-anticline (0.58). The differences in permeability (unit: 10-3 μm2) followed the order: anticline-gentle (0.24) > syncline-gentle (0.21) > gentle-syncline (0.19) = anticline-anticline (0.19) > syncline-syncline (0.17) > gentle-gentle (0.16) > gentle-anticline (0.11). (3) Comparisons of gas production characteristics of co-production wells at different structural locations showed that the anticline-anticline and anticline-gentle types had better gas output, with peak values generally exceeding 1 000 m3/d. The gentle-gentle, gentle-anticline, and gentle-syncline types showed significant production fluctuations, with peak values between 200 and 1 200 m3/d. The syncline-syncline and syncline-gentle types showed poorer gas production performance, with peak values only about 200-500 m3/d.

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