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贵州无井式UCG选址选层“四性”地质评价模式与资源类型划分

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煤炭学报 2024年第5期49卷 2414-2425页

作者：周泽易同生秦勇周永峰杨磊汪凌霞贵州省煤田地质局贵州贵阳550025 贵州优驰能源科技有限责任公司贵州贵阳550014 中国矿业大学江苏徐州221116 贵州省煤炭流态化开采重点实验室贵州贵阳550014

为建立科学系统的“地质−工程”一体化地质风险评估模式,解决煤炭地下气化(UCG)选址选层难题,提出了一种以“建炉可行性、过程易控性、气化安全性、开发经济性”四性认识为基础,利用FAHP模糊层次分析法创建的包括4项一级指标、10项2级... 详细信息

为建立科学系统的“地质−工程”一体化地质风险评估模式,解决煤炭地下气化(UCG)选址选层难题,提出了一种以“建炉可行性、过程易控性、气化安全性、开发经济性”四性认识为基础,利用FAHP模糊层次分析法创建的包括4项一级指标、10项2级指标、26项3级关键地质参数的地质评价要素层次结构模型。该模型引入“阈值”概念,对断层指数、奥亚膨胀度、黏结指数、上覆含水层距离4项指标的超“阈值”情况实施“一票否决”,充分重视特定地质参数对UCG控制的关键作用;通过“两两判断矩阵”确定各指标权重向量,根据隶属函数厘定指标层隶属度;并提出了相应地质评价技术方法,配套建立了权重积、综合权重积以及最优3段分割等算法,将所涉及指标量化分析,精准判断资源类型与级别;同时基于矩阵结构混合编码方式,提出了“四性四级”五位编码的UCG资源类型表征系统。最终形成了以“四性”理论为基础,“算法”为骨架,“四性四级”五位编码为灵魂的科学化、系统化UCG选址选层地质评价体系。该评价体系可在多场耦合的UCG生产过程相关风险识别机制的前沿探索方面发挥关键作用,有效改善现有UCG风险识别理论局限于地质单方面,缺乏工程联系的问题,实现大区域的UCG量化选址选层,为省级乃至国家级煤炭地下气化战略规划提供解决途径,从而提出可供分步实施的典型地质条件先导性试验区建议,推动煤炭地下气化产业化进程。

关键词：煤炭地下气化地质评价资源分类层次结构模型

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煤炭地下气化的敏感性地质因素探讨

煤田地质与勘探 2024年第3期52卷 24-36页

作者：周泽易同生秦勇周永峰汪凌霞孔维敏贵州省煤田地质局贵州贵阳550025 贵州优驰能源科技有限责任公司贵州贵阳550014 贵州省煤炭流态化开采重点实验室贵州贵阳550014 中国矿业大学江苏徐州221116

相对于地面煤化工装置,煤炭地下气化(UCG)炉体为地质体,地质条件准确认识是推进UCG气化成功的关键前提。为了最大限度避免煤炭地下气化选区选址地质风险,以贵州复杂地质条件为例,系统探讨其煤炭地下气化的敏感性地质因素。通过收集梳理... 详细信息

相对于地面煤化工装置,煤炭地下气化(UCG)炉体为地质体,地质条件准确认识是推进UCG气化成功的关键前提。为了最大限度避免煤炭地下气化选区选址地质风险,以贵州复杂地质条件为例,系统探讨其煤炭地下气化的敏感性地质因素。通过收集梳理贵州煤炭资源勘查资料,建立归一化的参数分级赋值、参数权重向量算法、参数权重积算法等数学模型,准确获取研究区地质参数量化数据;基于由26个地质因素构成的地质参数集,采用数理统计方法,识别地质风险关键因素对复杂构造区煤层UCG可行性的交叉影响,查明建炉可行性、过程易控性、气化安全性、开发经济性“四性”指标敏感性地质风险源。结果表明:“四性”指标地质参数的敏感性有所差异,建炉可行性、过程易控性、气化安全性、开发经济性的地质因素敏感性依次变弱,UCG可行性对建炉可行性的依赖性最强,过程易控性次之,其他两个条件离散性相对较大,敏感性明显降低;就敏感性程度而言,26项地质参数中最为敏感的是煤的坚固性系数,其他8个主控地质因素分别是煤层厚度、煤层倾角、煤厚变异系数、夹矸厚度系数、断层指数、煤层埋深、奥亚膨胀度和黏结指数,影响建炉可行性、过程易控性两个方面。就贵州UCG敏感性地质因素来说,UCG项目成功与否的关键在于建炉可行性,气化炉选址应优先考虑构造发育特征及其对煤层条件的影响;为持续推进煤炭地下气化产业发展,下一步或可立足于我国煤炭资源特性及赋存条件实际,以“四性”认识为基础建立统一的UCG地质风险评价准则,进而为典型地质条件先导性试验区选址提供科学依据。

关键词：无井式煤炭地下气化敏感性因素地质因素主成分分析气化炉选址

煤层气井产出水演化路径及产量判识意义——以黔西地区织金区块为例

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石油学报 2024年第3期45卷 517-530页

作者：郭晨李瑞腾秦勇卢玲玲易同生陈贞龙袁航高为程曦西安科技大学地质与环境学院陕西西安710054 陕西省煤炭绿色开发地质保障重点实验室陕西西安710054 西安科技大学煤炭绿色开采地质研究院陕西西安710054 中国矿业大学煤层气资源与成藏过程教育部重点实验室江苏徐州221116 西北大学地质学系陕西西安710069 中国煤炭地质总局航测遥感局陕西西安710199 贵州省煤田地质局贵州贵阳550008 中国石油化工股份有限公司华东油气分公司江苏南京210011 贵州省煤层气页岩气工程技术研究中心贵州贵阳550008

煤层气井的产出水蕴含着重要的地质与产能信息,揭示产出水的地球化学特征与主控因素,阐明产出水的演化路径及其与产能的内在关系,有助于理解产能的非均质性并为开发方案优化提供依据。近年来,黔西地区织金区块煤层气的勘探开发取得重要... 详细信息

煤层气井的产出水蕴含着重要的地质与产能信息,揭示产出水的地球化学特征与主控因素,阐明产出水的演化路径及其与产能的内在关系,有助于理解产能的非均质性并为开发方案优化提供依据。近年来,黔西地区织金区块煤层气的勘探开发取得重要突破,这为中国南方多层、薄层状煤层条件下煤层气的开发提供了技术示范,但仍然存在产出水质变化大、产能不确定性高、控产因素不明等问题。通过采集黔西地区织金区块上二叠统长兴组—龙潭组煤层气井的产出水样并开展水文地球化学测试,探讨了水化学特征、演化路径及其产量判识意义。产出水质包括Na-HCO_(3)型与Na-Cl型,前者的总固溶体(TDS)含量为944~2681 mg/L,后者的TDS含量为3603~8800 mg/L。以TDS含量为刻度,水样的5个聚类(聚类①—聚类⑤)代表地下水的滞留程度依次增高。脱硫酸作用、阳离子交换吸附作用、浓缩作用是控制产出水化学特征与演化的主要因素。产出水的水质变化先后经历了氧化条件下补给作用主导的低TDS含量(3000 mg/L)对应高产井。提取煤层气产量判识的关键水化学指标及其临界值,通过分析TDS含量和Cl^(-)、Na^(+)、Sr^(2+)等特征离子浓度可更有效地判识高产井;借助脱硫系数可更有效地判识低产井。黔西地区织金区块煤层气井的选址应避开地下水径流强烈地带,布设在具有高TDS含量、高Cl^(-)含量、低SO_(4)^(2-)含量的滞留区,珠藏次向斜轴部为布设煤层气井的有利区。水动力干扰及其诱发的低效降压仍是制约直井/定向井多层合采产能效率的重要因素。研究成果可为织金区块煤层气的高效开发与产出水的处理提供依据。

关键词：产出水水化学演化黔西地区煤层气合采流体干扰

Characteristics of dissolved inorganic carbon in produced water from coalbed methane wells and its geological significance

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Petroleum Exploration and Development 2020年第5期47卷 1074-1083页

作者： YANG Zhaobiao QIN Yong QIN Zonghao yi tongsheng LI Cunlei ZHANG Zhengguang Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221008China School of Resource and Geosciences China University of Mining and TechnologyXuzhou 221116China Guizhou Research Center of Shale Gas and CBM Engineering Technology Guiyang 550009China

Based on long-term dynamic tracing of dissolved inorganic carbon(DIC)and stable carbon isotope(δ13CDIC)in produced water from 20 coalbed methane(CBM)wells in western Guizhou,the spatial-temporal dynamic variations ofδ13CDIC of the GP well group produced in multi-layer commingled manner were analyzed,and the relationship between the value ofδ13CDIC and CBM productivity was *** produced water samples of typical wells in the GP well group were amplified and sequenced using 16S rDNA,and a geological response model ofδ13CDIC in produced water from CBM wells with multi-coal seams was put *** research shows that:δ13CDIC in produced water from medium-rank coal seams commonly show positive anomalies,the produced water contains more than 15 species of methanogens,and Methanobacterium is the dominant *** dominant methanogens sequence numbers in the produced water are positively correlated withδ13CDIC,and the positive anomaly of v is caused by reduction of methanogens,and especially hydrogenotrophic *** segmentation of sedimentary facies and lithology in stratum with multi-coal seams will result in permeability and water cut segmentation,which will lead to the segmentation ofδ13CDIC and archaea community in produced water,so in the strata with better permeability and high water cut,theδ13CDIC of the produced water is abnormally enriched,and the dominant archaea is mainly *** the strata with weak permeability and low water cut,theδ13CDIC of the produced water is small,and the microbial action is *** shallow layer close to the coal seam outcrop is likely to be affected by meteoric precipitation,so theδ13CDIC of the produced water is *** geological response model ofδ13CDIC in produced water from multi-coal seams CBM wells in the medium-rank coal reveals the geological mechanism and microbial action mechanism of theδ13CDIC difference in the produced water from the multi-coal seams CBM *** also provides effect

关键词： coalbed methane produced water from coal seam dissolved inorganic carbon stable carbon isotope archaea community microbial gene CBM productivity geological response model

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A method for identifying coalbed methane co-production interference based on production characteristic curves: A case study of the Zhijin block, western Guizhou, China

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Petroleum Exploration and Development 2022年第5期49卷 1126-1137页

作者： GUO Chen QIN Yong yi tongsheng CHEN Zhenlong YUAN Hang GAO Junzhe GOU Jiang College of Geology and Environment Xi'an University of Science and TechnologyXi'an 710054China Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation Xi'an 710054China Geological Research Institute for Coal Green Mining Xi'an University of Science and TechnologyXi'an 710054China Key Laboratory of CBM Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221116China Guizhou Bureau of Coal Geological Exploration Guiyang 550008China East China Oil&Gas Company SinopecNanjing 210011China

Efficient detection of coalbed methane(CBM) co-production interference is the key to timely adjusting the development plan and improving the co-production efficiency. Based on production data of six typical CBM co-production wells in the Zhijin block of western Guizhou Province, China, the production characteristic curves, including production indication curve, curve of daily water production per unit drawdown of producing fluid level with time, and curve of water production per unit differential pressure with time have been analyzed to explore the response characteristics of co-production interference on the production characteristic curves. Based on the unit water inflow data of pumping test in coal measures, the critical value of in-situ water production of the CBM wells is 2 m^(3)/(d·m). The form and the slope of the initial linear section of the production indication curves have clear responses to the interference, which can be used to discriminate internal water source from external water source based on the critical slope value of 200 m^(3)/MPa in the initial linear section of the production indication curve. The time variation curves of water production per unit differential pressure can be divided into two morphological types: up-concave curve and down-concave curve. The former is represented by producing internal water with average daily gas production greater than 800 m^(3)/d, and the latter produces external water with average daily gas production smaller than 400 m^(3)/d. The method and critical indexes for recognition of CBM co-production interference based on the production characteristic curve are constructed. A template for discriminating interference of CBM co-production was constructed combined with the gas production efficiency analysis, which can provide reference for optimizing co-production engineering design and exploring economic and efficient co-production mode.

关键词： coalbed methane multi-seam co-production interlayer interference production indication curve external water internal water discrimination template

Optimization methods of production layer combination for coalbed methane development in multi-coal seams

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Petroleum Exploration and Development 2018年第2期45卷 312-320页

作者： YANG Zhaobiao ZHANG Zhengguang QIN Yong WU Congcong yi tongsheng LI Yangyang TANG Jun CHEN Jie School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Key Laboratory of CBM Resources and Dynamic Accumulation Process Ministry of Education of ChinaXuzhou 221008China Guizhou Research Center of Shale Gas and CBM Engineering Technology Guiyang 550009China

Based on the productivity equation of coalbed methane(CBM) wells, three indexes, main production layer optimization index, main production layer expansion index and capacity contribution index are proposed, with which the three-step optimization method of production-layer combination is established. In selecting main production layer, the coal seam thickness, CBM content, coal seam permeability, coal seam reservoir pressure and coal structure are considered comprehensively to evaluate the potential of the production layer. In selecting expansion of the main production layer combination, on the premise of ensuring full and slow desorption of the main production layer and non-exposure of the main production layer out of liquid surface, the degree of mutual interference between the main and non-main production layers is comprehensively evaluated by coupling the critical desorption pressure, layer spacing and reservoir pressure gradient difference. In optimizing production layer combination, the main concern is the economic efficiency of the combined layers. Only when the contribution coefficient of the main production layer is greater than 30% and the contribution index of the other production layers is more than 10%, the economic benefit of a CBM well after being put into production can be ensured. Based on the comparative analysis of the development effect of the development test wells in Songhe of Guizhou province, it is proved that the "three-step method" for the optimization of production-layer combination is scientific and practical, and can be used to design the multi-layer commingling scheme of coalbed methane.

关键词： CBM multi-layer commingled production selection of main production layer combination optimization production contribution

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贵州化处矿区煤炭地下气化物理模拟试验

中国煤炭地质 2024年第8期36卷 17-25页

作者：周泽汪凌霞金黎黎易同生孔维敏梁杰贵州省煤田地质局贵州贵阳550081 贵州优驰能源科技有限责任公司贵州贵阳550014 贵州省煤炭流态化开采重点试验室贵州贵阳550014 中国矿业大学(北京)化学与环境工程学院北京100083

为了深入探究贵州六枝化处矿区贫煤气化工艺参数,稳步推进贵州煤炭地下气化工程示范,开展了系列地下气化物理模拟试验和理论分析。通过构建综合模型系统,模拟了不同氧气浓度、气化炉结构和煤层湿度等条件下的气化过程,系统地探究了贫煤... 详细信息

为了深入探究贵州六枝化处矿区贫煤气化工艺参数,稳步推进贵州煤炭地下气化工程示范,开展了系列地下气化物理模拟试验和理论分析。通过构建综合模型系统,模拟了不同氧气浓度、气化炉结构和煤层湿度等条件下的气化过程,系统地探究了贫煤地下气化的特性、气化效率和气化工艺参数等。试验结果表明,气化炉结构差异对合成气组分有显著影响,同时,气化通道的支护方式、气化剂浓度、煤层含水量也会影响合成气组分。在适当的氧气浓度下,贵州六枝化处地区的贫煤能够稳定气化产出合成气,70%以下富氧环境下,随着氧气浓度的增加,煤气有效组分逐渐提高,煤气热值也相应增加;超过70%富氧时,有效组分中CO含量开始下降;温度场方面,气化过程的推进会直接影响温度场推移方向,且在煤层中会存在高低温区交叉分布的特征,主要是由于煤层中煤块之间存在裂隙,形成绕流燃烧而引起的。后期实际生产中,要控制气化剂氧气浓度,提高气化效率;钻井底部加强支护,采取热胀冷缩保护;增加辅助措施维持气化炉内温度场稳定性;为了提高H_(2)、CO组分浓度,需注入雾化水,增加还原性。通过深入探究不同工艺参数条件下贵州化处矿区贫煤地下气化特性,为下一步实际生产中气化工艺参数优化、气化效率提高和煤气质量提升提供了科学数据支撑。

关键词：煤炭地下气化物理模拟气化工艺参数贫煤

贵州下寒武统牛蹄塘组页岩储层特征及其分布规律

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天然气工业 2014年第8期34卷 8-14页

作者：易同生赵霞贵州省煤层气页岩气工程技术研究中心

为合理评价贵州省下寒武统牛蹄塘组页岩气的资源开发潜力,利用野外地质调查及页岩气井勘探成果资料,结合钻井岩心样品测试、现场解吸及等温吸附实验等分析结果,研究了牛蹄塘组页岩储层发育的特征及其分布规律.结果表明：①该区牛蹄塘组... 详细信息

为合理评价贵州省下寒武统牛蹄塘组页岩气的资源开发潜力,利用野外地质调查及页岩气井勘探成果资料,结合钻井岩心样品测试、现场解吸及等温吸附实验等分析结果,研究了牛蹄塘组页岩储层发育的特征及其分布规律.结果表明：①该区牛蹄塘组页岩主要分布于黔北、黔中及黔南黔东南地区,岩性主要为含粉砂-粉砂质、碳质泥岩页岩;②牛蹄塘组页岩干酪根以腐泥型和偏腐泥混合型为主,生烃能力较强,有机碳含量介于0.7％～14.6％,有机质成熟度较高（Ro普遍大于2.5％）,处于过成熟演化阶段;③牛蹄塘组页岩脆性矿物含量高,黏土矿物以伊利石和伊蒙混层为主,具较好的破裂潜力,页岩孔隙度中等,渗透率极低,且两者呈线性负相关关系;④黔北西部、黔中地区牛蹄塘组页岩气富集区主要位于毕节-大方-黔西一带,含气量范围为1.5～2.5m3/t,黔北东部、黔东地区牛蹄塘组页岩现场解吸气量整体较好,而黔南、黔东南地区页岩气富集区位于丹寨-麻江-黄平一带,含气量范围为0.01～1.13 m3/t.

关键词：贵州早寒武世页岩气储集层特征富集区分布规律等温吸附含气量

六盘水煤田上二叠统煤系气成藏特征及共探共采方向

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煤炭学报 2018年第6期43卷 1553-1564页

作者：易同生高为贵州省煤层气页岩气工程技术研究中心贵州贵阳550008 贵州省煤田地质局贵州贵阳550008

六盘水煤田上二叠统含煤地层中煤层、页岩、砂岩叠置频繁,统筹勘探不同储层中的天然气有助于减少资源浪费,提高开发效益。通过对煤系气储层岩相、厚度、源岩地化、储层物性及空间赋存规律的研究,分析了六盘水煤田煤层气、煤系页岩气和... 详细信息

六盘水煤田上二叠统含煤地层中煤层、页岩、砂岩叠置频繁,统筹勘探不同储层中的天然气有助于减少资源浪费,提高开发效益。通过对煤系气储层岩相、厚度、源岩地化、储层物性及空间赋存规律的研究,分析了六盘水煤田煤层气、煤系页岩气和煤系致密气成藏潜力,讨论了煤系气的空间叠置关系和勘探前景。结果显示:区内晚二叠世煤层煤种齐全,厚度较大,变质程度普遍偏高,含气显示优越;页岩和砂岩累计厚度大,有机地球化学和储集物性参数良好;不同岩性的区域和层位分布差异较大,组合类型多样,空间配置关系有利于发育垂向多套天然气藏。煤系页岩气最有利勘探层位为龙潭组下段,煤层气和煤系致密气最有利层位为汪家寨组和龙潭组上段;以此为基础,总结提炼出"源储一体型"独立煤系页岩气藏、"源储紧邻型"煤系"三气"组合气藏、"下生上储型"煤系"两气"组合气藏共3种气藏类型。初步认为晴隆向斜深部为煤系页岩气优先勘探区,青山向斜深部适合煤层气和煤系页岩气共探共采,盘关向斜和格目底向斜深部适合煤层气和煤系致密砂岩气共探共采。

关键词：煤层气煤系页岩气煤系致密砂岩气成藏特征气藏类型共探共采