赵兴,常锁亮,曹文武,梁可,余攀,张生,幸晓凤
ZHAO Xing,CHANG Suoliang,CAO Wenwu,LIANG Ke,YU Pan,ZHANG Sheng,XING Xiaofeng

• 1:山西山地物探技术有限公司
• 2:太原理工大学地球科学与工程系
• 3:美中能源有限公司

摘要(Abstract)：

为明确沁水盆地MB区块山西组3~#煤层含气量及富集有利区，综合三维地震、测井和多种生产测试，在分析煤储层地球物理特征及含气地质控制作用的基础上，开展地质统计学反演、煤系沉积微相刻画及构造变形变位表征等研究，采用灰色关联分析构建3~#煤层含气量预测模型，识别划分MB区块煤层气富集有利区。结果表明：研究区煤系地层砂岩与泥岩波阻抗差异小，通过伽马重构声波约束地质统计学反演能提高煤系地层砂岩、泥岩及煤层的识别精度；3~#煤层具有东厚西薄的分布特点，煤厚受沉积作用控制，厚煤层集中在北部、中东部的岸后沼泽区；3~#煤层含气量受埋藏深度、地层变形、煤厚和沉积环境等因素的控制，埋藏深度大、煤层厚且地层变形程度弱的东部区域整体含气量高，平均可达16 m~3/t，埋藏深度浅、煤层薄、地层陡倾且断裂发育的西部区域含气量较低，平均低于5 m~3/t；以煤层厚度、含气量为富集性评价参数，将研究区分为Ⅰ类有利区、Ⅱ类较有利区和Ⅲ类不利区，Ⅰ类有利区的煤层厚度为6～8 m，含气量为15.0～22.0 m~3/t；Ⅱ类较有利区的煤层厚度为3～6 m，含气量为10.0～15.0 m~3/t；Ⅲ类不利区的煤岩厚度和含气量分别小于3 m和10.0 m~3/t。研究成果可为MB区块煤层气的开发有利区优选提供理论指导。
In order to clarify gas content and favorable areas of 3~# coalbed in Shanxi Formation in MB block of Qinshui Basin,by integrating 3D seismic,logging and various production testing,geostatistical inversion is carried out,sedimentary microfacies are described and structural deformation and displacement is characterized based on analysis of geophysical characteristics of coal reservoirs and geological control on gas content.Gray correlation analysis is used to construct model for predicting gas content of 3~# coalbed,and favorable coalbed methane areas in MB block are identified and divided.The results show that:Due to small wave impedance difference between sandstone and mudstone in coal strata of studied area,geostatistical inversion constrained by GR-reconstructed acoustic waves can improve identification accuracy of sandstone,mudstone and coalbed in coal strata.3~# coalbed distributes thick in the east and thin in the west.Coal thickness is controlled by sedimentary effect,with thick coalbeds concentrated in northern and central-eastern backshore marsh area.Gas content of 3~# coalbed is controlled by factors of burial depth,stratigraphic deformation,coal thickness and sedimentary environment,with overall high average of16.0 m~3/t in eastern area with large burial depth,thick coal seams and weak stratigraphic deformation,and low average of<5 m~3/t in western area with small burial depth,thin coal seams,steeply dipping strata and developed faults.Taking coalbed thickness and gas content as enrichment evaluation parameters,the studied area is divided into ClassⅠfavorable area,Class Ⅱ less favorable area and Class Ⅲ unfavorable area.Coalbed thickness of Class Ⅰ favorable area is 6～8 m,with gas content of 15.0～22.0 m~3/t.Coalbed thickness of Class Ⅱ less favorable area is 3～6 m,with gas content of 10.0～15.0 m~3/t.Coalbed thickness and gas content are respectively<3 m and<10.0 m~3/t in Class Ⅲ unfavorable area.The research provides theoretical guidance for favorable areas optimization of coalbed methane development in MB block.

关键词(KeyWords)： 煤层气;控气地质因素;含气性预测;灰色关联法;沁水盆地
coalbed methane;geological factors controlling gas content;gas-bearing properties prediction;gray correlation;Qinshui Basin

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目“等效介质模型约束的煤储层裂缝和物性参数OVT域AVAZ方法研究”（42102212）

作者(Author): 赵兴,常锁亮,曹文武,梁可,余攀,张生,幸晓凤
ZHAO Xing,CHANG Suoliang,CAO Wenwu,LIANG Ke,YU Pan,ZHANG Sheng,XING Xiaofeng

DOI: 10.19597/J.ISSN.1000-3754.202308029

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