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Excess pore pressure behavior and evolution in deep coalbed methane reservoirs

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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

Geochemical characteristics and origin of gases from the Upper,Lower Paleozoic and the Mesozoic reservoirs in the Ordos Basin,china

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Science china Earth Sciences 2008年第S1期51卷 183-194页

作者： HU AnPing 1 ,Li Jian 2 ,ZHANG WenZheng 3 ,LI ZhiSheng 2 ,HOU Lu 4 &LIU QuanYou 5 1 Department of Earth Sciences,Zhejiang University,Hangzhou 310027,china 2 Langfang Branch,Reasearch Institute of petroleum exploration and Development,Petrochina,Langfang 065007,china 3 Institute of exploration and Development,Petrochina changqing Oilfield Company,Xi’an 710021,china 4 University of petroleum,Beijing102249,china 5 Petrochina Research Institute of petroleum exploration and Development,Beijing 100083,china Department of Earth Sciences Zhejiang University Hangzhou China Langfang Branch Reasearch Institute of Petroleum Exploration and Development PetroChina Langfang China Institute of exploration and Development PetroChina Changqing Oilfield Company Xi’an China University of petroleum Beijing China Petrochina Research Institute of petroleum exploration and Development Beijing China

The Ordos Basin,the second largest sedimentary basin in china,contains the broad distribution of natural gas *** far,several giant gas fields have been discovered in the Upper and Lower Paleozoic in this basin,each having over 1000×10 8 m 3 of proven gas reserves,and several gas pools have also been discovered in the *** paper collected the data of natural gases and elucidated the geochemical characteristics of gases from different reservoirs,and then discussed their *** hydrocarbons preserved in the Upper Paleozoic,the elevatedδ13C values of methane,ethane and propane indicate that the gases would be mainly coal-formed gases;the singular reversal in the stable carbon isotopes of gaseous alkanes suggests the mixed gases from humic sources with different *** the Lower Paleozoic,theδ13C 1 values are mostly similar with those in the Upper Paleozoic,but theδ13C 2 andδ13C 3 values are slightly lighter,suggesting that the gases would be mixing of coal-type gases as a main member and oil-type *** are multiple reversals in carbon isotopes for gaseous alkanes,especially abnormal reversal for methane and ethane(i.e.δ13C 1 >δ13C 2 ),inferring that gases would be mixed between high-mature coal-formed gases and oil-type *** the Mesozoic,the δ13Cvalues for gaseous alkanes are enriched in 12C,indicating that the gases are mainly derived from sapropelic sources;the carbon isotopic reversal for propane and butane in the Mesozoic is caused by microbial oxidation and mixing of gases from sapropelic sources with different *** contrast to the Upper Paleozoic gases,the Mesozoic gases are characterized by heavier carbon isotopes of iso-butane than normal butane,which may be caused by gases generated from different kerogen types. Finally,according toδ13C 1 -Ro relationship and extremely low total organic carbon contents,the Low Paleozoic gases would not be generated from the Ordovician source as a main gas source,bycontrast, the Upper Pale

关键词： Ordos Basin natural gas chemical composition carbon isotope genesis

Impact of rock anisotropy on fracture development

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Progress in Natural Science:Materials International 2008年第11期18卷 1403-1408页

作者： Lianbo Zeng~(a,b,*) Jiyong Zhao~c Shengju Zhu~c Weiliang Xiong~c Yonghong He~c Jianwen Chen~c a Key State Laboratory of petroleum Resource and Prospecting in china University of petroleum,Beijing 102249,china b Resources and Information Faculty,china University of petroleum,Beijing 102249,china c exploration and Development Research Institute,changqing Oilfield Branch,Xi’an 710021,china Key State Laboratory of petroleum Resource and Prospecting in china University of petroleum Beijing 102249 China Resources and Information Faculty China University of Petroleum Beijing 102249 China exploration and Development Research Institute Changqing Oilfield Branch Xi’an 710021 China

Experiments on uniaxial and triaxial rock mechanics and rock acoustic emissions have been conducted for research on the impact of rock anisotropy on the development of the fractures of different directions by taking as an example the ultra-low-permeability sandstone reservoir in the Upper Triassic Yanchang Formation within the Ordos *** experimental results prove the existence of anisotropy of the rock mechanical property in the different directions on the plane,which is the chief reason for the production of impacts on the development of different assemblages of fractures in the geological *** rock anisotropy usually restricts the development of one assemblage of conjugate shear *** fractures in the Yanchang Formation within the Ordos Basin are mainly shear fractures that formed under two tectonic ***,here,four assemblages of shear fractures should have developed,but due to the effect of a strong rock anisotropy,in each period one assemblage of fractures chiefly ***,two assemblages of fractures are usually developed in every part at present.

关键词： Fracture Rock anisotropy Rock mechanical experiments Acoustic emission experiments

A REVIEW OF INTEGRATED exploration METHOD OF OIL AND GAS

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石油勘探与开发 1995年第2期 90-96页

作者： Deng Long-wu Guo Qian-jie(exploration bureau of china Naional petroleum Corporation)

ＡＲＥＶＩＥＷＯＦＩＮＴＥＧＲＡＴＥＤＥＸＰＬＯＲＡＴＩＯＮＭＥＴＨＯＤＯＦＯＩＬＡＮＤＧＡＳ￥ＤｅｎｇＬｏｎｇ－ｗｕ；ＧｕｏＱｉａｎ－ｊｉｅ（ＥｘｐｌｏｒａｔｉｏｎＢｕｒｅａｕｏｆＣｈｉｎａＮａｉｏｎａｌＰｅｔｒｏ... 详细信息

ＡＲＥＶＩＥＷＯＦＩＮＴＥＧＲＡＴＥＤＥＸＰＬＯＲＡＴＩＯＮＭＥＴＨＯＤＯＦＯＩＬＡＮＤＧＡＳ￥ＤｅｎｇＬｏｎｇ－ｗｕ；ＧｕｏＱｉａｎ－ｊｉｅ（ＥｘｐｌｏｒａｔｉｏｎＢｕｒｅａｕｏｆＣｈｉｎａＮａｉｏｎａｌＰｅｔｒｏｌｅｕｍＣｏｒｐｏｒａｔｉｏｎ）Ｔ...

关键词： A REVIEW OF INTEGRATED exploration METHOD OF OIL AND GAS

Fifty Years of Dedication to Technology Dissemination,New Journey Ahead with Splendid Chapter:To the 50^(th) Anniversary of petroleum exploration and Development

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petroleum exploration and Development 2024年第1期51卷 F0002-F0002页

作者： Editorial Office of petroleum exploration and Development 不详

As the New Year kicks off,it's also time to celebrate the 50^(th) Anniversary of petroleum exploration and *** the past 50 years,petroleum exploration and Development has been endeavoring to disseminating technology,witnessing and recording the glorious history of china's oil industry developing from weak to *** the new era,we have been focusing on theoretical innovation and technology advancement in oil and gas exploration and development,taking an edge on the latest development of the industry,continuously improving the quality of our journal,and leading the journal in a way of high quality and with special features.

关键词： journal petroleum recording

Warmly Congratulating on the Publication of the Monograph Giant Gas Fields and Gas Sources in china

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petroleum exploration and Development 2024年第2期51卷 F0002-F0002页

作者： Editorial Department of petroleum exploration and Development 不详

The monograph Giant Gas Fields and Gas Sources in china,compiled by the team led by Dai Jinxing,Academician of Chinese Academy of Sciences and Editor-in-Chief of petroleum exploration and Development,will be officially published by the petroleum Industry Press *** English version of this monograph is planned to be published in *** publication of this book will have an important and far-reaching impact on the geological theory,exploration and development,and scientific management of natural gas in ***,we warmly congratulate on the publication of the monograph Giant Gas Fields and Gas Sources in china!

关键词： Academician Giant petroleum

Geochemical characteristics and applications of 18α(H)-neohopanes and 17α(H)-diahopanes

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Chinese Science Bulletin 2000年第19期45卷 1742-1748页

作者： WANG Chunjiang, FU Jiamo, SHENG Guoying, XIAO Qianhua, LI Jinyou, ZHANG Yali & PIAO Mingzhi1. Slate Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences. Guang/hou 510640, china 2. Department of Geosciences, petroleum University, Beijing 102200, china 3. Institute of petroleum exploration and Exploitation, Liaohe bureau of petroleum exploration, Panjin 240000, china State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Department of Geosciences Petroleum University Beijing China Institute of petroleum exploration and Exploitation Liaohe Bureau of Petroleum Exploration Panjin China

Distributions and geochemical significances of 18α(H)-neohopanes and of 17α(H)-diahopanes in oils from west Xialiaohe depression of the Bohai Bay Basin have been studied. Relative abundance of 18α(H)-neohopanes and of 17α(H)-diahopanes can be effectively used as maturity parameters, in a range of medium-high mature stage, based on consideration on sedimentary-organic facies of source rocks. With a dual geochemical significance of maturity and sedimentary-organic facies, neohopane and diahopane parameters can be well used in oil-source correlation and in petroleum population division. Formation, primary concentration and preservation of precursors of rearranged hopanes are closely related to depositional conditions such as Eh-pH and clays content. A series of probable diahopanes (series D) was detected in the oils, which exhibits a similar distribution pattern and geochemical behavior as that of 17α(H)-diahopanes (series B).

关键词： 18α(H)-neohopane 17α(H)-diahopane maturity sedimentary-organic facies.

A physical model study of effect of fracture aperture on seismic wave

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Science china Earth Sciences 2008年第S2期51卷 233-240页

作者： WEI JianXin & DI BangRang CNPC Key Physical exploration Laboratory,china University of petroleum,Beijing 102248,china CNPC Key Physical exploration Laboratory China University of Petroleum Beijing China

Based on Hudson’s theoretical hypothesis of equivalent fracture model,inserting aligned round chips in solid model can simulate fractured media. The effect of fractures on the propagation of P and S waves can be observed by changing the fracture thickness. The base model is made of epoxy resin,and the material of fractures is a kind of low-velocity mixture containing silicon rubber. With constant diameter and number of fractures in each model,one group of models can be formed through changing the thickness of fracture. These models have the same fracture density. By using the ultrasonic pulse transmission method,the experiment records time and waveform of P and S waves in the direction parallel and perpendicular to the fracture orientation. The result shows that,with the same fracture density,changing fracture aperture will affect both velocity and amplitude of P and S waves,and the effect on P-wave amplitude is much greater than that on the velocity. Moreover,the variation in velocity of S wave is more obvious in the slow shear wave (S2),while the variation in amplitude is more obvious in the fast shear wave (S1). These properties of wave propagation are useful for seismic data processing and interpretation.

关键词： fracture aperture Hudson’s fracture theory fractured model P-and S-wave velocity amplitude

Geological characteristics of large gas provinces and large gas fields in china

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Science china Earth Sciences 2008年第S1期51卷 14-35页

作者： ZOU CaiNeng &TAO ShiZhen Research Institute of petroleum exploration and Development,Petrochina,Beijing 100083,china Research Institute of petroleum exploration and Development PetroChina Beijing China

Based on the examination of the global researches on oil and gas provinces and large gas fields and the analysis of the features,attributes and distribution of large gas provinces and gas fields,this paper puts forward three indicators of determining large oil and gas provinces:spatial indicator,reservoir-forming indicator and resource *** classifies the gas accumulated areas and large gas provinces in china and analyzes the controlling factors on the distribution of large gas provinces and large gas fields:the lateral distribution is mainly controlled by high-energy sedimentary facies and constructive diagenetic facies,palaeo-highs and their periclinal zones,deep faults,etc,and the vertical distribution is mainly controlled by unconformities,series of evaporates and deep low-velocity highly-conductive beds,*** also reveals the main geological characteristics of large gas provinces and large gas fields in *** gas fields in four-type basins have their own characteristics and onland large gas fields are dominantly developed in foreland basins and craton basins;there are three types of gas sources,of which,coal is the main source with high gas generating intensity and varying origins;reservoir rocks of the large gas fields(provinces)are of various types and dominated generally by low-middle permeability and porosity pore-type reservoirs;structural traps and litho-stratigraphic traps coexist in Chinese large gas fields and form dense high abundance and large-area low and middle-abundance large gas fields;most of the large gas fields have late hydrocarbon-generation peaks and reservoir formation,and experienced the process of multiple-stage charging and late finalization; large gas provinces(fields)have good sealing and preservation conditions,and evaporates seals are largely developed in large and extra-large gas *** paper intends to shed light on the exploration and development of large gas fields(provinces)through analyzing their geological

关键词： large gas province large gas field indicator of large oil and gas provinces forming condition distribution characteristics geological feature