陈明君, 陈雪妮, 康毅力,等.鄂东缘大吉区块深层煤岩气藏储层敏感性评价及损害机理研究[J].河南理工大学学报（自然科学版）,2026,45(1):18-28.

CHEN M J, CHEN X N, KANG Y L, ,et al.Investigation of reservoir sensitivity evaluation and damage mechanism in deep coalbed methane reservoirs of the Daji Block in Eastern Ordos Basin[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(1):18-28.

鄂东缘大吉区块深层煤岩气藏储层敏感性评价及损害机理研究

陈明君1, 陈雪妮1, 康毅力1, 郭智栋2,3, 王玉斌2,3, 石阳4, 游利军1, 代汪汝1, 颜茂凌1

1.西南石油大学 油气藏地质及开发工程全国重点实验室，四川 成都  610500；2.中国石油煤层气有限责任公司工程技术研究院，陕西 西安  710082；3.中联煤层气国家工程研究中心有限责任公司，北京  100095；4.中国石油勘探开发研究院，北京  100083

摘要: 目的 为明确深层煤岩气藏储层敏感性特征及损害机理，开展深层煤岩气藏储层敏感性评价及损害机理研究。 方法 以鄂尔多斯盆地大吉区块深层煤岩为研究对象，利用薄片鉴定、Ｘ射线衍射检测、扫描电镜分析等方法，明确深层煤岩储层特征和潜在敏感性因素，揭示深层煤岩储层敏感性损害机理。 结果 结果表明：（1）研究区煤岩显微组分以镜质组为主，惰质组含量较少，不含壳质组；无机组分以石英和黏土矿物为主，石英含量为22.60%，黏土矿物为57.05%（以高岭石为主）；孔隙结构多见铸模孔、胞腔孔和气孔，裂缝较发育但多被充填；孔隙度和渗透率较低，孔隙连通性差。（2）存在速敏、水敏、盐敏、碱敏和应力敏感损害。其中，速敏指数82.64%，表现出强速敏损害；水敏、盐敏和碱敏指数分别为53.90%，57.00%，63.50%，均为中等偏强敏感性损害；应力敏感系数为0.692 9~0.938 3，为中等偏强至强应力敏感损害。无酸敏损害，酸液处理可提高渗透率。（3）高温、高压、高应力环境导致岩石力学强度较弱，易诱发应力敏感损害；矿物成分中黄铁矿、高岭石和伊利石含量较高，在复杂流体作用下易产生自生胶结，并在裂缝或孔喉处沉积，阻碍气体产出；高矿化度地层水在钻采过程中易引发盐析堵塞。 结论 研究结果提高了工作液体系和生产制度的合理性，对加大煤岩气储层保护，提高煤层气产量具有积极意义。

关键词:深层煤岩气;储层特征;储层敏感性;储层损害

doi:10.16186/j.cnki.1673-9787.2025030056

基金项目:国家自然科学基金资助项目（41902154）；中国石油前瞻性、基础性科研攻关项目（2021DJ2304）；中国石油科技创新基金项目（2024DQ02-0112）

收稿日期:2025/03/25

修回日期:2025/07/01

出版日期:2025-12-03

Investigation of reservoir sensitivity evaluation and damage mechanism in deep coalbed methane reservoirs of the Daji Block in Eastern Ordos Basin

Chen Mingjun1, Chen Xueni1, Kang Yili1, Guo zhidong2,3, Wang Yubin2,3, Shi Yang4, You Lijun1, Dai Wangru1, Yan Maoling1

1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu  610500， Sichuan， China；2.Engineering Technology Research Institute， Petro China Coalbed Methane Co.， Ltd.， Xi’an  710082， Shaanxi， China；3.China United Coalbed Methane National Engineering Research Center Co.， Ltd.， Beijing  100095， China；4.Petro China Research Institute of Petroleum Exploration & Development， Beijing  100083， China

Abstract: Objectives To clarify the sensitivity characteristics and damage mechanisms of deep coalbed methane （CBM），a study on sensitivity evaluation and damage mechanisms is conducted. Methods The deep CBM reservoirs in the Daji Block of the Ordos Basin is investigated in this study. Petrographic thin-section analysis， X-ray diffraction （XRD）， and scanning electron microscopy （SEM） are employed to  characterize the deep CBM reservoirs and identify potential sensitivity-inducing factors. Laboratory experiments are conducted to evaluate the fluid and stress sensitivity of the deep coal samples， thereby elucidating the mechanisms of damage associated with sensitivity effects. Results （1） The coal maceral composition in the study area is dominated by vitrinite， with a low inertinite content and an absence of liptinite. The inorganic components are mainly quartz and clay minerals， with quartz content at 22.60% and clay minerals at 57.05% （predominantly kaolinite）. The pore structure is characterized by abundant cast membrane pores， cellular pores， and gas pores， with well-developed fractures that are mostly filled by clay minerals or calcite. The porosity and permeability are relatively low，and pore connectivity is poor. （2） The CBM reservoir exhibits velocity sensitivity， water， salt， alkali，and stress sensitivity. The velocity sensitivity index is 82.64%，indicating strong damage. The water， salt， and alkali sensitivity indices are 53.90%， 57.00%， and 63.50%， respectively， representing moderately strong damage. The stress sensitivity coefficient ranges from 0.692 9 to 0.938 3， indicating moderately strong to strong damage. However， no acid sensitivity damage is observed， and acid treatment can enhance permeability. （3） The high-temperature， high-pressure， and high-stress environment of deep CBM reservoir leads to low rock mechanical strength， making them highly susceptible to stress sensitivity damage. The high content of pyrite， kaolinite， and illite in the mineral composition tends to autogenous cementation under complex fluid conditions， causing pore and fracture blockage that hinders gas production. Furthermore， high-salinity formation water is prone to salt precipitation and crystallization blockages during drilling and production. Conclusions The findings improve the rationale for designing working fluid systems and production regimes. This is of positive significance for enhancing coal reservoir protection and increasing coalbed methane production.

Key words:deep coalbed methane;reservoir characteristics;reservoir sensitivity;reservoir damage