河南理工大学学报（自然科学版）2026，Vol.45Issue(1)：18-28,11.DOI:10.16186/j.cnki.1673-9787.2025030056
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
Investigation of reservoir sensitivity evaluation and damage mechanism in deep coalbed methane reservoirs of the Daji Block in Eastern Ordos Basin
摘要
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 experi-ments are conducted to evaluate the fluid and stress sensitivity of the deep coal samples,thereby elucidat-ing 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 in-organic 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 res-ervoir 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 dam-age 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 min-eral 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 precipita-tion and crystallization blockages during drilling and production.Conclusions The findings improve the ra-tionale for designing working fluid systems and production regimes.This is of positive significance for en-hancing coal reservoir protection and increasing coalbed methane production.关键词
深层煤岩气/储层特征/储层敏感性/储层损害Key words
deep coalbed methane/reservoir characteristics/reservoir sensitivity/reservoir damage分类
能源科技引用本文复制引用
陈明君,陈雪妮,康毅力,郭智栋,王玉斌,石阳,游利军,代汪汝,颜茂凌..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):18-28,11.基金项目
国家自然科学基金资助项目(41902154) （41902154）
中国石油前瞻性、基础性科研攻关项目(2021DJ2304) （2021DJ2304）
中国石油科技创新基金项目(2024DQ02-0112) （2024DQ02-0112）
