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Excess pore pressure behavior and evolution in deep coalbed methane reservoirs

International Journal of Mining Science and Technology 2024年第6期34卷 763-781页

作者： Changqing Liu zhaobiao yang Yong Qin Xia Yan Yunhai Wang Zhe Wang Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center of Coalbed Methane Development&Utilization Beijing 100095China PetroChina Coalbed Methane Company Limited Beijing 102200China SINOPEC East China Oil and Gas Company Nanjing 210000China

Deep coalbed methane(DCBM),an unconventional gas reservoir,has undergone significant advancements in recent years,sparking a growing interest in assessing pore pressure dynamics within these *** some production data analysis techniques have been adapted from conventional oil and gas wells,there remains a gap in the understanding of pore pressure generation and evolution,particularly in wells subjected to large-scale hydraulic *** address this gap,a novel technique called excess pore pressure analysis(EPPA)has been introduced to the coal seam gas industry for the first time to our knowledge,which employs dual-phase flow principles based on consolidation *** technique focuses on the generation and dissipation for excess pore-water pressure(EPWP)and excess pore-gas pressure(EPGP)in stimulated deep coal *** have been developed respectively and numerical solutions have been provided using the finite element method(FEM).Application of this model to a representative field example reveals that excess pore pressure arises from rapid loading,with overburden weight transferred under undrained condition due to intense hydraulic fracturing,which significantly redistributes the weight-bearing role from the solid coal structure to the injected fluid and liberated gas within artificial pores over a brief ***,field application indicates that the dissipation of EPWP and EPGP can be actually considered as the process of well production,where methane and water are extracted from deep coalbed methane wells,leading to consolidation for the artificial ***,history matching results demonstrate that the excess-pressure model established in this study provides a better explanation for the declining trends observed in both gas and water production curves,compared to conventional practices in coalbed methane reservoir engineering and petroleum *** research not only enhances the understanding of DCBM re

关键词： Deep coalbed methane Consolidation Excess pore-water pressure Excess pore-gas pressure Production data analysis

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新疆准噶尔盆地白家海凸起深部煤层气勘探开发进展及启示

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煤田地质与勘探 2024年第2期52卷 13-22页

作者：兰浩杨兆彪仇鹏王彬刘常青梁宇辉王钰强中国石油新疆油田分公司勘探开发研究院新疆克拉玛依834000 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221008

白家海凸起侏罗系煤是国内深部煤层气直井产量很早取得突破的地方,为准噶尔盆地的重要靶区。煤储层为特低灰、低水分、中高挥发性煤,孔渗系统较好。具有“古生新储”和“自生自储”两种成藏模式,煤层含气量高、游离气占比高、含气饱和度... 详细信息

白家海凸起侏罗系煤是国内深部煤层气直井产量很早取得突破的地方,为准噶尔盆地的重要靶区。煤储层为特低灰、低水分、中高挥发性煤,孔渗系统较好。具有“古生新储”和“自生自储”两种成藏模式,煤层含气量高、游离气占比高、含气饱和度高,为优质煤层气储层。历经多年的勘探开发证明:多数直井试采无需排水降压即可快速见气(2~5 d),排采初期日产气量较高(2100~9890 m^(3)),日产水量少甚至不产水(<5 m^(3)),可自喷生产,返排率低,长期试采压力均衡下降,且具有一定的稳产期(25~60 d);煤层射孔层厚度、压裂液体系、压裂加砂比均可影响煤层气试气效果,其中冻胶、胍胶体系优于活性水-清洁压裂液体系。最新施工的彩探1H水平井试采表现出压裂开井后即高产,试采最高日产气量5.7万m^(3),日产水量少(0.5~3.0 m^(3)),表现出常规天然气特征,随后衰减稳定,表现为吸附气与游离气共同产出;与直井对比,水平井产量高、稳产时间长、压降速率小。基于研究区储层特征和含气性特征,及勘探开发历程,得到3方面启示。一是深部多类型气藏富集规律再认识:需重视油气运聚圈闭的成藏演化研究,重视深部位气水空间分配和富集规律的研究。二是深部中低阶煤储层可压性评价:针对凸起高部位孔渗系统好的中低煤阶储层,需形成适合的压裂工艺体系。三是深部多类型气藏开发方式优化:针对游离气占比高的气藏,实现游离气-吸附气的接续产出,保持降压面积稳定扩展,排采控制尤为关键。

关键词：准噶尔盆地白家海凸起深部煤层气孔渗系统成藏特征勘探开发进展

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Prediction of geotemperatures in coal-bearing strata and implications for coal bed methane accumulation in the Bide-Santang basin,western Guizhou,China

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International Journal of Mining Science and Technology 2020年第2期30卷 235-242页

作者： Chen Guo Yong Qin Dongmin Ma zhaobiao yang Lingling Lu College of Geology and Environment Xi’an University of Science&TechnologyXi’an 710054China Stations for Post-doctoral Research of Geological Resources and Geological Engineering Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of CBM Resources and Reservoir Formation Process Ministry of EducationChina University of Mining&TechnologyXuzhou 221116China

The geothermal fields of coal-bearing strata have become a key topic in geological research into coal and coal bed methane(CBM).Based on temperature data from 135 boreholes that penetrate the Upper Permian coal-bearing strata in the Bide-Santang basin,western Guizhou,the precisions of geothermal predictions made using a geothermal gradient model and a gray sequence GM(1,1)model are analyzed and *** results indicate that the gray sequence GM(1,1)model is more appropriate for the prediction of geothermal *** GM(1,1)model is used to predict the geothermal field at three levels with depths of 500,1000,and 1500 m,as well as within the No.6,No.16,and No.27 coal *** results indicate that the geotemperatures of the 500 m depth level are between 21.0 and 30.0°C,indicating no heat damage;the geotemperatures of the 1000 m depth level are between 29.4 and 44.7°C,indicating the first level of heat damage;and the geotemperatures of the 1500 m depth level are between35.6 and 63.4°C,indicating the second level of heat *** CBM contents are positively correlated with the geotemperatures of the coal *** target area for CBM development is identified.

关键词： Geotemperature Gray sequence Geothermal gradient Heat damage Coal Coal bed methane

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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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新疆准噶尔盆地白家海凸起深部煤层气孔渗系统特征

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煤田地质与勘探 2024年第6期52卷 33-43页

作者：陈河青杨兆彪李道清徐苗苗梁宇辉刘常青王钰强中国石油新疆油田分公司勘探开发研究院新疆克拉玛依834000 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221008

【目的】新疆深部煤层气资源丰富,其中准噶尔盆地白家海凸起侏罗系煤层是深部煤层气勘探开发的有利目标区。深部煤层气孔渗系统直接决定了深部煤层气的可采性。【方法】以新疆油田2023年最新施工的彩煤2-004H评价井为基础,基于扫描电镜... 详细信息

【目的】新疆深部煤层气资源丰富,其中准噶尔盆地白家海凸起侏罗系煤层是深部煤层气勘探开发的有利目标区。深部煤层气孔渗系统直接决定了深部煤层气的可采性。【方法】以新疆油田2023年最新施工的彩煤2-004H评价井为基础,基于扫描电镜观察,压汞–低温液氮–二氧化碳吸附、低场核磁共振、CT扫描,变温压孔渗实验,结合数学建模,深入研究了本区侏罗系西山窑组煤的孔渗系统。【结果和结论】结果表明:(1)研究区深部煤储层孔隙类型以植物组织孔和气孔为主,孔裂隙发育,形态多为板状和狭缝状,孔裂隙连通性好,多为开放型孔。(2)全孔径表征结果显示,超微孔最为发育,其次为中孔和过渡孔,各类型孔隙发育较为均匀,总孔比表面积和总孔容较大,接近于贫煤和无烟煤,暗示了其吸附性和储集能力较强,其主要地质原因在于其煤层为特低灰分(平均灰分在5%左右)煤、煤岩显微组分中主要为丝质体和结构腐殖体,且处于构造高部位的煤储层断裂发育。(3)考虑温度和有效应力对孔隙率和渗透率的影响,建立了研究区孔隙率和渗透率与埋深的关系式。与鄂尔多斯盆地大宁-吉县区块深部煤相比,不论是常规孔渗结果,还是模拟原位储层条件下的孔渗系统,白家海凸起深部煤储层孔隙率和渗透率均较大,原位储层条件下孔隙率介于8.60%~10.21%,渗透率介于(0.04~0.21)×10^(-3)μm^(2)。即本区深部煤储层孔渗系统,不仅储气能力较强,同时其导流能力也较好。

关键词：准噶尔盆地白家海凸起深部煤层气全孔径表征孔渗系统

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A study on the flowability of gas displacing water in low-permeability coal reservoir based on NMR technology

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Frontiers of Earth Science 2020年第4期14卷 673-683页

作者： Minfang yang zhaobiao yang Bin Sun Zhengguang Zhang Honglin Liu Junlong Zhao Department of Unconventionals Research Institute of Petroleum Exploration and DevelopmentPetroChinaLangfang065007China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou221008China School of Resource and Geosciences China University of Mining and TechnologyXuzhou221116China

Flowability of gas and water through low-permeability coal plays crucial roles in coalbed methane(CBM)recovery from coal *** better understand this phenomenon,experiments examining the displacement of water by gas under different displacement pressures were systematically carried out based on nuclear magnetic resonance(NMR)technology using low-permeability coal samples of medium-high coal rank from Yunnan and Guizhou,*** results reveal that both the residual water content(W_(r))and residual water saturation(S_(r))of coal gradually decrease as the displacement pressure(P)*** P is 0-2 MPa,the decline rates of W_(r) and S_(r) are fastest,beyond which they slow down *** samples with higher permeability exhibit higher water flowability and larger decreases in W_(r) and S_(r).Compared with medium-rank coal,high-rank coal shows weaker fluidity and a higher proportion of irreducible *** relationship between P and the cumulative displaced water content(W_(c))can be described by a Langmuir-like equation,W_(c)=WLP/(PL+P),showing an increase in W_(c) in coal with an increase in *** the low-pressure stage from 0 to 2 MPa,W_(c) increases most rapidly,while in the high-pressure stage(P>2 MPa),W_(c) tends to be *** minimum pore diameter(d′)at which water can be displaced under different displacement pressures was also *** d′value decreases as P increases in a power relationship;i.e.,d′the coal gradually decreases with the gradual increase in ***,the d′values of most of the coal samples are close to 20 nm under a P of 10 MPa.

关键词： coalbed methane low-permeability coal reservoir NMR gas displacing water flowability pore size

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Multi-Layer Superposed Coalbed Methane System in Southern Qinshui Basin, Shanxi Province, China

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Journal of Earth Science 2015年第3期26卷 391-398页

作者： Zheng Zhang Yong Qin Xuehai Fu zhaobiao yang Chen Guo School of Resources and Goesciences China University of Mining and Technology Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process Ministry of EducationChina University of Mining and Technology

Multi-coalbed developed in Carboniferous–Permian coal-bearing strata of southern Qinshui Basin, and different coal-bearing segments have different coalbed methane（CBM） reservoiring characteristics. Analysis of previous studies suggests that the essence of an unattached CBM system is to possess a unified fluid pressure system, which includes four key elements, namely, gas-bearing coal-rock mass, formation fluid, independent hydrodynamic system and capping layer condition. Based on the exploration and exploitation data of CBM, it is discovered that the gas content of coal seams in southern Qinshui Basin presents a change rule of non-monotonic function with the seam dipping, and a turning point of the change appears nearby coal seam No. 9, and coal seams of the upper and the lower belong to different CBM systems respectively; well test reservoir pressure shows that the gradient of coal seam No. 15 of the Taiyuan Formation is significantly higher than that of coal seam No. 3 of the Shanxi Formation; the equivalent reservoir pressure gradient of coal seam No. 15 ＂jumps＂ obviously compared with the reservoir pressure gradient of coal seam No. 3 in the same vertical well, that is, the relation between reservoir pressure and burial depth takes on a characteristic of nonlinearity; meanwhile, the vertical hydraulic connection among the aquifers of Shanxi Formation and Taiyuan Formation is weak, constituting several relatively independent fluid pressure systems. The characteristics discussed above reveal that the main coal seams of southern Qinshui Basin respectively belong to relatively independent CBM systems, the formation of which are jointly controlled by sedimentary, hydrogeological and structural conditions.

关键词： multi-coalbed coalbed methane system fluid pressure system equivalent reservoir pressure gradient formation mechanism

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Mechanism of pore pressure variation in multiple coal reservoirs,western Guizhou region,South China

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Frontiers of Earth Science 2021年第4期15卷 770-789页

作者： Wei JU zhaobiao yang Yulin SHEN Hui yang Geoff WANG Xiaoli ZHANG Shengyu WANG Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering The University of QueenslandBrisbane St Lucia 4072Australia

Pore pressure is an important parameter in coalbed methane(CBM)exploration and development;however,the distribution pattern and mechanism for pore pressure differences in the Upper Permian CBM reservoirs are poorly understood in the western Guizhou region of South *** this study,lateral and vertical variations and mechanisms for pore pressure differences are analyzed based on 126 injection-falloff and in-situ stress well test data measured in Permian coal ***,based on the pore pressure gradient and coefficient in coal reservoirs of the western Guizhou region,five zones can be delineated laterally:the mining areas of Zhina,northem Liupanshui,northern Guizhou,northwestern Guizhou and southern ***,there are two main typical patterns:i)the pore pressure gradient(or coefficient)is nearly unchanged in different coal reservoirs,and ii)the pore pressure gradient(or coefficient)has cyclic variations in a borehole profile with multiple coal seams,which suggests the existence of a"superimposed CBM system".The mechanism analysis indicates that coal permeability,thermal evolution stage and hydrocarbon generation contribute little to pore pressure differences in coal reservoirs in the western Guizhou *** present-day in-situ stress field,basement structure and tectonic activity may be the dominant factors affecting lateral pore pressure *** sealing capacity of caprocks and the present-day in-situ stress field are significant para-meters causing vertical pore pressure differences in coal *** results are expected to provide new geological references for CBM exploration and develop-ment in the western Guizhou region.

关键词： pore pressure difference influencing factor coalbed methane reservoir Upper Permian western Guizhou region

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Characteristics of microbial communities in water from CBM wells and biogas production potential in eastern Yunnan and western Guizhou, China

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Frontiers of Earth Science 2023年第1期17卷 180-196页

作者： Wenguang TIAN zhaobiao yang Zonghao QIN Yong QIN Cunlei LI Benju LU Yongchen LI Department of Unconventionals Research Institute of Petroleum Exploration and DevelopmentPetroChinaLangfang 065007China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education)China University of Mining and Technology Xuzhou 221008China School of Resource and Geosciences China University of Mining and TechnologyXuzhou 221116China PetroChina Coalbed Methane Company Limited Beijing 100028China

The study of microbial communities in the produced water of coalbed methane(CBM)wells is an important aspect of microbial-enhanced methane *** produced from 15 CBM wells in four synclines in eastern Yunnan and western Guizhou was *** the use of 16S ribosomal RNA(16S rRNA)amplicon sequencing and realtime fluorescence quantitative polymerase chain reaction(PCR),the characteristics of bacterial and archaeal communities before and after enrichment culture were *** methanogenic pathways of secondary biogas were discussed,and potential microbial-enhanced methane production was preliminarily *** results showed that the bacterial DNA content in uncultured produced water was low,so it is difficult to *** enrichment,the dominant bacteria phyla were Proteobacteria,Bacteroidetes,and Firmicutes.A total of seven phyla were detected in the uncultured produced water,and the dominant archaeal phylum was *** were the main component of *** dominant archaeal genera were Methanobacterium,Methanoculleus and *** community structure of the archaea changed noticeably after four days of enrichment *** relative abundance of Euryarchaeota increased to 99%in most samples after enrichment *** was found that there was a transition from Methanoregula to Methanobacterium within *** relative abundance of Methanobacterium increased,which can produce hydrogenotrophic *** with the isotopic composition of the produced water and gas,it is considered that the CBM in the Tucheng and Enhong synlines consists of a mixture of thermogenic gas and *** proportion of secondary biogas in the Tucheng and Enhong synlines are estimated to range from 10.89% to 49.62%.There are mainly hydrogentrophic methanogens in the study area,and CO_(2) reduction is the main way of microbial gas *** enrichment culture of produced water in the study area,the hydrogenotrophic met

关键词： eastern Yunnan and western Guizhou produced water form CBM wells 16S amplicon sequencing secondary biogas microbial-enhanced methane production

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黔西盘关向斜两翼现今地应力差异及影响因素分析

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中国煤炭地质 2024年第5期36卷 1-6页

作者：赵习龙鞠玮杨兆彪王胜宇煤层气资源与成藏过程教育部重点实验室江苏徐州221008 中国矿业大学资源与地球科学学院江苏徐州221116

现今地应力发育特征与分布规律对煤层气高效勘探和开发具有重要指导意义,而断层、褶皱等构造对地应力分布具有显著控制作用,即便在同一褶皱内,不同部位的现今地应力也可能存在差异。以黔西盘关向斜为例,首先基于注入/压降试井数据,计算... 详细信息

现今地应力发育特征与分布规律对煤层气高效勘探和开发具有重要指导意义,而断层、褶皱等构造对地应力分布具有显著控制作用,即便在同一褶皱内,不同部位的现今地应力也可能存在差异。以黔西盘关向斜为例,首先基于注入/压降试井数据,计算获取实测点地应力大小;然后利用测井资料,结合修正Anderson模型,计算获取盘关向斜两翼地层现今地应力大小及分布,查明盘关向斜不同部位地应力的差异性,并重点分析了地质构造与岩石力学参数对盘关向斜两翼现今地应力的控制作用。结果表明,区域地应力大小与地层弹性模量具有正相关性,与断层数量及规模呈现负相关关系。在相同深度下,储层现今地应力越大,渗透率越低,正断型应力机制影响下的煤层渗透性较逆断型的好。研究成果可以为盘关向斜煤层气勘探和开发提供基础地质参数。

关键词：现今地应力影响因素盘关向斜渗透率黔西地区

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