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Role of bedding planes played in enhancing dissolution in sandstones

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Frontiers of Earth Science 2022年第3期16卷 587-600页

作者： Jin LAI Xiaojiao PANG Meng BAO Bing wang Jianan YIN guiwen wang Xuechun FAN State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China

Diagenesis exerts an important control on porosity evolution,and research of diagenesis and diagenetic minerals provides insights into reservoir quality evaluation and CO_(2) *** section,XRD(X-ray diffraction),CT(Computed Tomography),scanning electron microscopy(SEM),and NMR(Nuclear Magnetic Resonance)tests were used to investigate composition,texture,pore spaces,and diagenesis of sandstones in Paleogene Dongying Formation in Bohai Bay Basin,China,with special aims to unravel diagentic dissolution along bedding *** oversized pores,remnants in feldspar-hosted pores,and kaolinite within feldspar grains indicate a high degree of dissolution the framework grains experienced during *** CO_(2)-rich or organic acids are responsible for the feldspar *** size plays the primary role in enhancing bedding dissolution process,and bedding planes in fine-medium grained sandstones with high content of feldspars are frequently enlarged by *** CT scanning image confirms dissolution pores are distributed discontinuously along the bedding *** dissolution pores along bedding planes have large pore size,and correspond to the right peak of the bi-modal T_(2)(transverse relaxation time)*** laminated sandstones and siltstones,or sandstones with cross beddings help improve framework grain *** new findings help improve the understanding of diagenetic models,and have implications in reservoir quality prediction and resource assessments in sandstones.

关键词： dissolution sandstones diagenesis bedding plane Dongying Formation

Combination of multi-focus Raman spectroscopy and compressive sensing for parallel monitoring of single-cell dynamics

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Journal of Innovative Optical Health Sciences 2021年第6期4卷 119-130页

作者： Zhenzhen Li Xiujuan Zhang Chengui Xiao Da Chen Shushi Huang Pengfei Zhang guiwen wang School of Precision Instruments and Optoelectronics Engineering Tianjin University Tianjin 300072China Guangxi Key Laboratory of Marine Natural Products and Combinatorial Biosynthesis Chemistry Guangxi Academy of Sciences 98 Daling Road NanningGuangxi 530007China College of Physics Science and Technology Guangxi Normal University 15 Yucai Road GuilinGuangxi 541004China Food Inspection and Quarantine Technology Center of Shenzhen Customs Shenzhen Academy of Inspection and Quarantine Shenzhen Guangdong 518045China Center for Aircraft Fire and Emergency Civil Aviation University of China Tianjin 300300China

To overcome the low efficiency of conventional confocal Raman spectroscopy,many efforts have been devoted to parallelizing the Raman excitation and acquisition,in which the scattering from multiple foci is projected onto different locations on a spectrometer's CCD,along either its vertical,horizontal dimension,or even *** the latter projection scheme relieves the limitation on the row numbers of the CCD,the spectra of multiple foci are recorded in one spectral channel,resulting in spectral ***,we developed a method under a com-pressive sensing framework to demultiplex the superimposed spectra of multiple cells during their dynamic *** the previous methods which ignore the information connection be-tween the spectra of the cells recorded at different time,the proposed method utilizes a prior that a cell's spectra acquired at different time have the same sparsity structure in their principal *** than independently demultiplexing the mixed spectra at the individual time intervals,the method demultiplexes the whole spectral sequence acquired continuously during the dynamic *** penalizing the sparsity combined from all time intervals,the collaborative optimization of the inversion problem gave more accurate recovery *** performances of the method were substantiated by a 1D Raman tweezers array,which monitored the germination of multiple bacterial *** method can be extended to the monitoring of many living cells randomly scattering on a coverslip,and has a potential to improve the throughput by a few orders.

关键词： Confocal Raman spectroscopy compressive sensing single-cell dynamics

Study of a plugging microbial consortium using crude oil as sole carbon source

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Petroleum Science 2008年第4期5卷 367-374页

作者： wang Jing Yan guiwen An Mingquan Liu Jieli Zhang Houming Chen Yun School of Chemical Science ＆ Engineering China University of Petroleum Beijing 102249 China

A microbial consortium named Y4 capable of producing biopolymers was isolated from petroleum-contaminated soil in the Dagang Oilfield, China. It includes four bacterial strains： Y4-1 （Paenibacillus sp.）, Y4-2 （Actinomadura sp.）, Y4-3 （Uncultured bacterium clone） and Y4-4 （Brevibacillus sp.）. The optimal conditions for the growth of the consortium Y4 were as follows： temperature about 46 ℃, pH about 7.0 and salinity about 20.0 g/L. The major metabolites were analyzed with gas chromatographymass spectrometry （GC-MS）. A comparison was made between individual strains and the microbial consortium for biopolymer production in different treatment processes. The experimental results showed that the microbial consortium Y4 could produce more biopolymers than individual strains, and the reason might be attributed to the synergetic action of strains. The biopolymers were observed with optical and electron microscopes and analyzed by paper chromatography. It was found that the biopolymers produced by the microbial consortium Y4 were insoluble in water and were of reticular structure, and it was concluded that the biopolymers were cellulose. Through a series of simulation experiments with sand cores, it was found that the microbial consortium Y4 could reduce the permeability of reservoir beds, and improve the efficiency of water flooding by growing biomass and producing biopolymers. The oil recovery was enhanced by 3.5% on average. The results indicated that the consortium Y4 could be used in microbial enhanced oil recovery and play an important role in bioremediation of oil polluted environments.

关键词： Microbial enhanced oil recovery plugging microbial consortium biopolymers

How high can fracture porosity become in the ultra-deep subsurface?

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Geoscience Frontiers 2023年第5期14卷 233-240页

作者： Jin Lai Fei Zhao Mei Zhang Tianyu Bai Yuyue Huang Dong Li guiwen wang Ziqiang Qin State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)102249China Department of Petroleum Engineering University of WyomingLaramieWY 82071USA

Knowledge of how high can fracture porosity become in the ultra-deep burial conditions is important but remains *** aperture and porosity are measured using X-ray computed tomography(CT)at atmospheric pressure and then calculated by image *** attention is paid to how high fracture porosity can become in ultra-deep(>6000 m)settings,and which situations will result in high fracture *** situ stress magnitudes,which can be calculated using well logs,control fracture performances,and dissolution along fracture improve fracture porosity at ultra-deep burial *** horizontal stress difference(Dr45 MPa),a high degree of dissolution along the fracture dramatically increases fracture *** will result in the vuggy fracture planes and improve fracture porosity up to 2.0%.The results provide insights into the detection,characterization,and modeling of subsurface fractures.

关键词： Fracture porosity Image log Ultra-deep In-situ stress Dissolution

Fluid Property Discrimination in Dolostone Reservoirs Using Well Logs

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Acta Geologica Sinica(English Edition) 2020年第3期94卷 831-846页

作者： wang guiwen LAI Jin LIU Bingchang FAN Zhuoying LIU Shichen SHI Yujiang ZHANG Haitao CHEN Jing State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Research Institute of Petroleum Exploration and Development Changqing Oilfield CompanyCNPCXi’an 710018China

The Ordovician Majiagou Formation is one of the main gas-producing strata in the Ordos Basin,*** identification of hydrocarbon-bearing intervals via conventional well logs is a challenging *** study describes the litholog of Ma 5(Member 5 of Majiagou Formation)dolostones,and then analyzes the responses of various conventional well logs to the presences of natural *** lithology of the gas bearing layers is dominantly of the dolomicrite to fine to medium crystalline *** gas can be produced from the low resistivity layers,and the dry layers are characterized by high ***-density crossovers are not sensitive to the presences of natural *** addition,there are no significant increases in sonic transit times in natural gas bearing ***(nuclear magnetic resonance)logs,DSI(Dipole Sonic Imager)logs and borehole image logs(XRMI)are introduced to discriminate the fluid property in Majiagou dolostone *** gas bearing intervals have broad NMR T2(transverse relaxation time)spectrum with tail distributions as well as large T2gm(T2 logarithmic mean values)values,and the T2 spectrum commonly display polymodal *** contrast,the dry layers and water layers have low T2gm values and very narrow T2 spectrum without *** gas bearing layers are characterized by low Vp/Vs ratios,low Poisson’s ratios and low P-wave impedances,therefore the fluid property can be discriminated using DSI logs,and the interpretation results show good matches with the gas test *** apparent formation water resistivity(AFWR)spectrum can be derived from XRMI image logs by using the Archie’s formula in the flushed *** gas bearing layers have broad apparent formation water resistivity spectrum and tail distributions compared with the dry and water layers,and also the interpretation results from the image logs exhibit good agreement with the gas test *** fluid property in Majiagou dolostone reservoirs can be discriminated throug

关键词： fluid property NMR DSI image logs Majiagou Formation Ordos Basin

Geological and Engineering‘Sweet Spots'in the Permian Lucaogou Formation,Jimusar Sag,Junggar Basin

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1214-1228页

作者： LAI Jin BAI Tianyu LI Hongbin PANG Xiaojiao BAO Meng wang guiwen LIU Bingchang LIU Shichen National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China

Unconventional oil and gas resources require petrophysical logs to answer the question of how best to optimize geological and engineering‘sweet spots'.Therefore,the establishment of a key well with comprehensive descriptions of lithology,reservoir properties,hydrocarbon-bearing properties,electronic well log responses,source rock properties,brittleness,and in situ stress magnitude and direction is important for the effective exploration and production of unconventional hydrocarbon ***,thin sections,scanning electron microscopy(SEM)and comprehensive well log suites are used to build a key well for the Permian Lucaogou Formation,Jimusar Sag of the Junggar *** results show that there are three main types of lithologies,including siltstone,mudstone and *** can be predicted using the combination of conventional well and image *** pore spaces consist of interparticle pores,intragranular dissolution pores and *** Magnetic Resonance(NMR)T_(2)components longer than 1.7 ms are superposed as effective *** is calculated using the Coates model from NMR T_(2)*** ratio of T_(2)components>7.0 ms to T_(2)components>0.3 ms is used to calculate oil *** is calculated using theΔlog R *** index is calculated using Poisson-Young's method,ranging from 13.42%-70.53%.In situ stress direction is determined,and in situ stress magnitudes(maximum horizontal stress SH_(max),minimum horizontal stress Sh_(min),vertical stress S_(v))are calculated using density and sonic *** strike-slip stress type(SH_(max)>S_(v)>Sh_(min))is *** key well which comprehensively includes the above seven properties is *** and engineering(geomechanical)‘sweet spots'are then optimized from the key well by fully analyzing lithology,reservoir property,oilbearing potential,in situ stress magnitude and *** is hoped that the results support engineers'and geologists'decisions

关键词： key well unconventional oil and gas resources ‘sweet spot' well logs Lucaogou Formation Jimusar Sag

Enhanced thermoelectric properties of p-type polycrystalline SnSe by regulating the anisotropic crystal growth and Sn vacancy

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Chinese Physics B 2018年第4期27卷 103-109页

作者： Chengyan Liu Lei Miao Xiaoyang wang Shaohai Wu Yanyan Zheng Ziyang Deng Yulian Chen guiwen wang Xiaoyuan Zhou Guangxi Key Laboratory of Information Material Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science and Engineering Guilin University of Electronic Technology Guilin 541004 China College of Physics Chongqing University Chongqing 401331 China

Thermoelectric selenides have attracted more and more attentions ***,p-type Sn Se polycrystalline bulk materials with good thermoelectric properties are *** using the SnSe2 nanostructures synthesized via a wetchemistry route as the precursor,polycrystalline Sn Se bulk materials were successfully obtained by a combined heattreating process under reducing atmosphere and following spark plasma sintering *** a reference,the Sn Se nanostructures synthesized via a wet-chemistry route were also fabricated into polycrystalline bulk materials through the same *** thermoelectric properties of the Sn Se polycrystalline transformed from SnSe2 nanostructures indicate that the increasing of heattreating temperature could effectively decrease the electrical resistivity,whereas the decrease in Seebeck coefficient is nearly *** a result,the maximum power factor is enhanced from 5.06×10^-4W/m·K^2 to 8.08×10^-4W/m·K^2 at 612℃.On the other hand,the reference sample,which was obtained by using Sn Se nanostructures as the precursor,displays very poor power factor of only 1.30×10^-4W/m·K^2 at 537℃.The x-ray diffraction（XRD）,scanning electron microscope（SEM）,x-ray fluorescence（XRF）,and Hall effect characterizations suggest that the anisotropic crystal growth and existing Sn vacancy might be responsible for the enhanced electrical transport in the polycrystalline Sn Se prepared by using SnSe2 *** the other hand,the impact of heat-treating temperature on thermal conductivity is not *** to the boosting of power factor,a high z T value of 1.07 at 612℃ is *** study provides a new method to synthesize polycrystalline Sn Se and pave a way to improve the thermoelectric properties of polycrystalline bulk materials with similar layered structure.

关键词： thermoelectric properties SnSe2 nanostructures polycrystalline SnSe anisotropic crystal growth

Application of geophysical well logs in solving geologic issues:Past,present and future prospect

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Geoscience Frontiers 2024年第3期15卷 85-118页

作者： Jin Lai Yang Su Lu Xiao Fei Zhao Tianyu Bai Yuhang Li Hongbin Li Yuyue Huang guiwen wang Ziqiang Qin National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Department of Petroleum Engineering University of WyomingLaramieWY 82071USA

Geophysical well logs are widely used in geological fields,however,there are considerable incompatibilities existing in solving geological issues using well log *** review critically fills the gaps between geology and geophysical well logs,as assessed from peer reviewed papers and from the authors’personal experiences,in the particular goal of solving geological issues using geophysical well *** origin and history of geophysical logging are *** follows a review of the state of knowledge for geophysical well logs in terms of type of specifications,vertical resolution,depth of investigations and demonstrated *** the current status and advances in applications of geophysical well logs in fields of structural geology,sedimentary geology and petroleum geology are *** logs are used in structural and sedimentary geology in terms of structure detection,in situ stress evaluation,sedimentary characterization,sequence stratigraphy division and fracture *** logs can also be applied in petroleum geology fields of optimizing sweet spots for hydraulic fracturing in unconventional oil and gas *** well logs are extending their application in other fields of geosciences,and geological issues will be efficiently solved via well logs with the improvements of advanced well log *** work is required in order to improve accuracy and diminish uncertainties by introducing artificial *** review provides a systematic and clear descriptions of the applications of geophysical well log data along with examples of how the data is displayed and processed for solving geologic problems.

关键词： Geophysical well logs Sequence stratigraphy Source rock Unconventional oil and gas resources Artificial intelligence

A Study on Identification of Conglomerate Reservoir Parameters and Oil/Water Beds in Ke82 Well Areas of Junggar Basin

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Journal of China University of Geosciences 2002年第4期13卷 338-344页

作者： wang guiwen Zhang Qing Li Mingrui Resources and Information Institute, University of Petroleum, Beijing 102249 Resources and Information Institute University of Petroleum Beijing 102249

This paper is mainly about the calculation of reservoir parameters and theinterpretation method for identifying oil/water beds in Ke82 well areas of Junggar basin. It isdifficult to determine the reservoir parameters with common logging methods such as core calibrationlog because of the diversity of minerals and rocks and the complexity of pore structures in theconglomerate reservoir of Junggar basin. Optimization logging exploration is a good method todetermine the porosity by establishing the multi-mineral model with logging curves based on theintegration of geological, core and well testing data. Permeability is identified by BP algorithm ofneural network. Hydrocarbon saturation is determined by correlating Archie's and Simandouxformulas. Comparing the exploratory result and core data, we can see that these methods areeffective for conglomerate logging exploration. We processed and explained six wells in the Ke82well areas. And actual interpretation has had very good results, 85 % of which conform to welltesting data. Therefore, this technique will be effective for identifying conglomerate parameters.

关键词： reservoir parameters log interpretation model conglomerate reservoir junggar basin