深部致密煤藏适度就地气化可行性评价方法及应用  

Feasibility evaluation method and application of moderate in-situ gasification in deep tight coal&gas reservoirs

作　　者：康毅力[1] 邵俊华 刘嘉榕 陈明君[1] 游利军[1] 陈雪妮 曹望坤 KANG Yili;SHAO Junhua;LIU Jiarong;CHEN Mingjun;YOU Lijun;CHEN Xueni;CAO Wangkun(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Engineering Technology Research Institute,Coalbed Methane Co.,Ltd.,PetroChina,Xi’an,Shaanxi 710082,China)

机构地区：[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]中石油煤层气有限责任公司工程技术研究院,陕西西安710082

出　　处：《油气藏评价与开发》2025年第2期237-249,共13页Petroleum Reservoir Evaluation and Development

基　　金：中国石油前瞻性、基础性科研攻关项目“煤系地层‘三气合采’立体开发技术研究”(2021DJ2304);非常规油气层保护四川省青年科技创新研究团队项目“页岩气层氧化协同水力压裂减量增渗方法研究”(2021JDTD0017)。

摘　　要：为形成对于深部致密煤藏系统评价,保证深部致密煤藏就地气化工程的高效、经济和安全实施,基于模糊层次分析法形成了深部致密煤藏适度就地气化可行性评价方法,包括:①建立资源条件、储集条件和保存条件在内的3类一级指标和煤级、煤岩储层厚度和煤岩储层压力系数等参数在内的18项二级指标的评价指标集和以“可行”“基本可行”“不可行”为评语的分级评语集;②通过层次分析法,明确各类指标权重;③采用梯形型隶属函数计算各指标隶属度,构建评价矩阵;④将评价矩阵和权重矩阵合成,确定候选区致密煤藏适度就地气化对“可行”“基本可行”“不可行”的隶属度,根据最大隶属度原则,明确候选区深部致密煤藏适度就地气化可行性。将评价方法应用于鄂尔多斯盆地M区块深部8号煤藏适度就地气化可行性评价,评价结果表明:M区块深部8号煤藏适度就地气化对应“可行”“基本可行”“不可行”的隶属度分别为0.413、0.425和0.162,最大隶属度为0.425,确定8号煤藏适度就地气化可行性为“基本可行”。深部致密煤藏适度就地气化可行性评价方法为综合性的定量评价方法,更加注重对保存条件的评价,为深部致密煤藏适度就地气化工程实施提供了科学指导。In order to establish a systematic evaluation of deep tight coal reservoirs and ensure the efficient,economic and safe implementation of moderate in-situ gasification projects in deep tight coal reservoirs,a feasibility evaluation method based on fuzzy analytic hierarchy process was developed.The methodology comprises:(1)the establishment of an evaluation index set of 3 first-level indicators,including resource conditions,reservoir conditions and preservation conditions,and 18 second-level indicators,including parameters such as coal rank,coal rock reservoir thickness,and coal rock reservoir pressure coefficient,along with a graded comment set categorizing outcomes as“feasible”,“basically feasible”,and“infeasible”;(2)the determination of indicator weights through the analytic hierarchy process;(3)the calculation of each indicator’s membership degree using a trapezoidal membership function to construct an evaluation matrix;and(4)the synthesis of the evaluation and weight matrices to ascertain the membership degrees corresponding to“feasible”,“basically feasible”,and“infeasible”for candidate areas,thus determining the feasibility based on the principle of maximum membership degree.The evaluation method was applied to the feasibility evaluation of moderate in-situ gasification for the deep No.8 tight coal reservoir in the M block of the Ordos Basin.The evaluation results show that the membership degrees of“feasible”,“basically feasible”and“infeasible”for moderate in-situ gasification of No.8 coal reservoir in the deep part of M block are 0.413,0.425 and 0.162 respectively,with the maximum being 0.425,thus determining the feasibility as“basically feasible”.The comprehensive quantitative feasibility evaluation method of moderate in-situ gasification of deep tight coal reservoir,which places particular emphasis on the evaluation of preservation conditions,provides scientific guidance for the implementation of moderate in-situ gasification projects in deep tight coal reservoirs.

关 键 词：致密煤藏 适度就地气化 模糊层次综合评价 可行性评价 煤岩储层评价 

分 类 号：TE357[石油与天然气工程—油气田开发工程]