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石油科学（英文版）
石油科学（英文版）

季刊

1672-5107

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010-82370092

100083

北京市学院路20号石油大院15楼317室

石油科学（英文版）/Journal Petroleum ScienceCSCD北大核心SCI
查看更多>>本刊办刊宗旨在于向国外介绍中国石油界最新的学术、科研成果，广泛开展国际间的学术交流，促进中国石油科学技术的发展。主要刊登反映中国石油石油科学技术领域最新、最高水平科研成果的科技论文。其专业内容包括石油勘探与开发、石油储运工程、石油炼制与化工、石油机电工程、油田化工、石油工业经济管理与营销以及与石油工业有关的各个学科。
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    Application of sparse S transform network with knowledge distillation in seismic attenuation delineation

    Nai-Hao LiuYu-Xin ZhangYang YangRong-Chang Liu...
    2345-2355页
    查看更多>>摘要：Time-frequency analysis is a successfully used tool for analyzing the local features of seismic data.However,it suffers from several inevitable limitations,such as the restricted time-frequency resolution,the difficulty in selecting parameters,and the low computational efficiency.Inspired by deep learning,we suggest a deep learning-based workflow for seismic time-frequency analysis.The sparse S transform network(SSTNet)is first built to map the relationship between synthetic traces and sparse S transform spectra,which can be easily pre-trained by using synthetic traces and training labels.Next,we introduce knowledge distillation(KD)based transfer learning to re-train SSTNet by using a field data set without training labels,which is named the sparse S transform network with knowledge distillation(KD-SSTNet).In this way,we can effectively calculate the sparse time-frequency spectra of field data and avoid the use of field training labels.To test the availability of the suggested KD-SSTNet,we apply it to field data to estimate seismic attenuation for reservoir characterization and make detailed comparisons with the traditional time-frequency analysis methods.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Viscoacoustic generalized screen propagator in constant-Q model

    Zhong-Kui DaiJia-Chun YouXing-Guo HuangWei Liu...
    2356-2369页
    查看更多>>摘要：When seismic waves propagate through the geological formation,there is a significant loss of energy and a decrease in imaging resolution,because of the viscoacoustic properties of subsurface medium.This profoundly impacts seismic wavefield propagation,imaging and interpretation.To accurately image the true structure of subsurface medium,the consensus among geophysicists is to no longer treat subsurface medium as ideal homogeneous medium,but rather to incorporate the viscoacoustic properties of sub-surface medium.Based on the generalized screen propagator using conventional acoustic wave equation(acoustic GSP),our developed method introduces viscoacoustic compensation strategy,and derives a one-way wave generalized screen propagator based on time-fractional viscoacoustic wave equation(viscoacoustic GSP).In numerical experiments,we conducted tests on two-dimensional multi-layer model and the Marmousi model.When comparing with the acoustic GSP using the acoustic data,we found that the imaging results of the viscoacoustic GSP using the viscoacoustic data showed a significant attenuation compensation effect,and achieved imaging results for both algorithms were essentially consistent.However,the imaging results of acoustic GSP using viscoacoustic data showed significant attenuation effects,especially for deep subsurface imaging.This indicates that we have proposed an effective method to compensate the attenuated seismic wavefield.Our application on a set of real seismic data demonstrated that the imaging performance of our proposed method in local areas surpassed that of the conventional acoustic GSP.This suggests that our proposed method holds practical value and can more accurately image real subsurface structures while enhancing imaging resolution compared with the conventional acoustic GSP.Finally,with respect to computational efficiency,we gathered statistics on running time to compare our proposed method with conventional Q-RTM,and it is evident that our method exhibits higher computational efficiency.In summary,our proposed viscoacoustic GSP method takes into account the true properties of the medium,still achieves migration results comparable to conventional acoustic GSP.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Rock physical characteristics of deep dolomite under complex geological conditions:A case study of 4th Member of Sinian Dengying Formation in the Sichuan Basin,China

    Chuang LiShu-Xin PanHong-Bin WangJi-Xin Deng...
    2370-2382页
    查看更多>>摘要：The deep-ultra deep carbonate reservoir in China,commonly subjected to modification of multi-stage diagenesis,has extremely high heterogeneity.Conventional rock physics analysis cannot accurately identify the elastic responses of reservoir.Here,the rock physics properties of the dolomite from the 4th Member of the Sinian Dengying Formation are experimentally measured,and the change law of rock physics characteristics is investigated within the framework of the diagenetic processes by the analysis of the elastic and petrologic characteristics,pore structure,and sedimentary environments.The results show that the differentiated diagenesis results in different pore structure characteristics and micro-texture characteristics of the rock.The microbial dolomite of the algal mound-grain beach facies is subjected to the contemporaneous microbial dolomitization and seepage-reflux dolomitization,pene-contemporaneous selective dissolution,burial dolomitization,and hydrothermal dolomitization.The resultant crystalline dolomite is found with one main type of the dolomite crystal contact boundaries,and the dissolution pore is extensive development.The siliceous,muddy,and limy dolomite of the inter-beach sea environment mainly experiences the weak capillary concentration dolomitization,intensive mechanical compaction-induced densification,and burial dolomitization.Such crystalline dolomite is observed with four types of contact boundaries,namely the dolomite contact,clay contact,quartz contact,and calcite contact boundaries,and porosity mostly attributed to residual primary inter-granular or crystalline pores.The samples with the same crystal boundary condition have consistent correlations between the compressional-and shear-wave velocities,and between the compressional-wave velocity and the velocity ratio.Additionally,the variation of the acoustic velocity with effective pressure and the intensity of pore-scale fluid-related dispersion are controlled by the differentiation of pore structure types of the samples.The varied effects of soft pores like micro-cracks on the compressional-and shear-wave velocity causes considerable changes in the relationships between the compressional-and shear-wave velocities,compressional-wave velocity and velocity ratio,and porosity and acoustic velocity.This research is an attempt to demonstrate a novel method for investigating the rock physics variation of rock during the geological process,and the obtained findings can provide the rock physics basis for seismic prediction of the characteristics of deep carbonate reservoirs.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Similarities and differences in inherent mechanism and characteristic frequency between the one-dimensional poroelastic model and the layered White model

    Li-Ming ZhaoCai-Ping LuYang LiuChao-Chao Li...
    2383-2392页
    查看更多>>摘要：The similarities and differences in inherent mechanism and characteristic frequency between the one-dimensional(1D)poroelastic model and the layered White model were investigated.This investiga-tion was conducted under the assumption that the rock was homogenous and isotropic at the meso-scopic scale.For the inherent mechanism,both models resulted from quasi-static flow in a slow P-wave diffusion mode,and the differences between them originated from saturated fluids and boundary con-ditions.On the other hand,for the characteristic frequencies of the models,the characteristic frequency of the 1D poroelastic model was first modified because the elastic constant and formula for calculating it were misused and then compared to that of the layered White model.Both of them moved towards higher frequencies with increasing permeability and decreasing viscosity and diffusion length.The dif-ferences between them were due to the diffusion length.The diffusion length for the 1D poroelastic model was determined by the sample length,whereas that for the layered White model was determined by the length of the representative elementary volume(REV).Subsequently,a numerical example was presented to demonstrate the similarities and differences between the models.Finally,published experimental data were interpreted using the 1D poroelastic model combined with the Cole-Cole model.The prediction of the combined model was in good agreement with the experimental data,thereby validating the effectiveness of the 1D poroelastic model.Furthermore,the modified characteristic fre-quency in our study was much closer to the experimental data than the previous prediction,validating the effectiveness of our modification of the characteristic frequency of the 1D poroelastic model.The investigation provided insight into the internal relationship between wave-induced fluid flow(WIFF)models at macroscopic and mesoscopic scales and can aid in a better understanding of the elastic modulus dispersion and attenuation caused by the WIFF at different scales.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Experimental investigation on pyrolysis products and pore structure characteristics of organic-rich shale heated by supercritical carbon dioxide

    Bai-Shuo LiuChuan-Jin YaoJia-Long QiYa-Qian Liu...
    2393-2406页
    查看更多>>摘要：The efficient pyrolysis and conversion of organic matter in organic-rich shale,as well as the effective recovery of pyrolysis shale oil and gas,play a vital role in alleviating energy pressure.The state of carbon dioxide(CO2)in the pyrolysis environment of shale reservoirs is the supercritical state.Its unique su-percritical fluid properties not only effectively heat organic matter,displace pyrolysis products and change shale pore structure,but also achieve carbon storage to a certain extent.Shale samples were made into powder and three sizes of cores,and nitrogen(N2)and supercritical carbon dioxide(ScCO2)pyrolysis experiments were performed at different final pyrolysis temperatures.The properties and mineral characteristics of the pyrolysis products were studied based on gas chromatography analysis,X-ray diffraction tests,and mass spectrometry analysis.Besides,the pore structure characteristics at different regions of cores before and after pyrolysis were analyzed using N2 adsorption tests to clarify the impact of fracturing degree on the pyrolysis effect.The results indicate that the optimal pyrolysis tem-perature of Longkou shale is about 430 ℃.Compared with N2,the oil yield of ScCO2 pyrolysis is higher.The pyrolysis oil obtained by ScCO2 extraction has more intermediate fractions and higher relative molecular weight.The ScCO2 can effectively improve the pore diameter of shale and its effect is better than that of N2.The micropores are produced in shale after pyrolysis,and the macropores only are generated in ScCO2 pyrolysis environments with temperatures greater than 430 ℃.The pore structure has different development characteristics at different pyrolysis temperatures,which are mainly affected by the pressure holding of volatile matter and products blocking.Compared to the surface of the core,the pore development effect inside the core is better.With the decrease in core size,the pore diameter,specific surface area,and pore volume of cores all increase after pyrolysis.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Influence of pore structure heterogeneity on channeling channels during hot water flooding in heavy oil reservoir based on CT scanning

    Qing-Jun DuHao-Yu ZhengJian HouYong-Ge Liu...
    2407-2419页
    查看更多>>摘要：Hot water flooding is an effective way to develop heavy oil reservoirs.However,local channeling channels may form,possibly leading to a low thermal utilization efficiency and high water cut in the reservoir.The pore structure heterogeneity is an important factor in forming these channels.This study proposes a method that mixes quartz sand with different particle sizes to prepare weakly heterogeneous and strongly heterogeneous models through which hot water flooding experiments are conducted.During the experiments,computer tomography(CT)scanning identifies the pore structure and micro remaining oil saturation distribution to analyze the influence of the pore structure heterogeneity on the channeling channels.The oil saturation reduction and average pore size are divided into three levels to quantitatively describe the relationship between the channeling channel distribution and pore structure heterogeneity.The zone where oil saturation reduction exceeds 20％is defined as a channeling channel.The scanning area is divided into 180 equally sized zones based on the CT scanning images,and three-dimensional(3D)distributions of the channeling channels are developed.Four micro remaining oil distribution patterns are proposed,and the morphology characteristics of micro remaining oil inside and outside the channeling channels are analyzed.The results show that hot water flooding is more balanced in the weakly heterogeneous model,and the oil saturation decreases by more than 20％in most zones without narrow channeling channels forming.In the strongly heterogeneous model,hot water flooding is unbalanced,and three narrow channeling channels of different lengths form.In the weakly heteroge-neous model,the oil saturation reduction is greater in zones with larger pores.The distribution range of the average pore size is larger in the strongly heterogeneous model.The network remaining oil inside the channeling channels is less than outside the channeling channels,and the hot water converts the network remaining oil into cluster,film,and droplet remaining oil.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Performance and enhanced oil recovery efficiency of an acid-resistant polymer microspheres of anti-CO2 channeling in low-permeability reservoirs

    Hai-Zhuang JiangHong-Bin YangRuo-Sheng PanZhen-Yu Ren...
    2420-2432页
    查看更多>>摘要：CO2 flooding is a vital development method for enhanced oil recovery in low-permeability reservoirs.However,micro-fractures are developed in low-permeability reservoirs,which are essential oil flow channels but can also cause severe CO2 gas channeling problems.Therefore,anti-gas channeling is a necessary measure to improve the effect of CO2 flooding.The kind of anti-gas channeling refers to the plugging of fractures in the deep formation to prevent CO2 gas channeling,which is different from the wellbore leakage.Polymer microspheres have the characteristics of controllable deep plugging,which can achieve the profile control of low-permeability fractured reservoirs.In acidic environments with supercritical CO2,traditional polymer microspheres have poor expandability and plugging properties.Based on previous work,a systematic evaluation of the expansion performance,dispersion rheological properties,stability,deep migration,anti-CO2 channeling and enhanced oil recovery ability of a novel acid-resistant polymer microsphere(DCNPM-A)was carried out under CQ oilfield conditions(salinity of 85,000 mg/L,80 ℃,pH=3).The results show that the DCNPM-A microsphere had a better expansion performance than the traditional microsphere,with a swelling rate of 13.5.The microsphere dispersion with a concentration of 0.1％-0.5％had the advantages of low viscosity,high dispersion and good injectability in the low permeability fractured core.In the acidic environment of supercritical CO2,DCNPM-A microspheres showed excellent stability and could maintain strength for over 60 d with less loss.In core experiments,DCNPM-A microspheres exhibited delayed swelling characteristics and could effectively plug deep formations.With a plugging rate of 95％,the subsequent enhanced oil recovery of CO2 flooding could reach 21.03％.The experimental results can provide a theoretical basis for anti-CO2 channeling and enhanced oil recovery in low-permeability fractured reservoirs.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Intelligent responsive self-assembled micro-nanocapsules:Used to delay gel gelation time

    Chuan-Hong KangJi-Xiang GuoDong-Tao FeiWyclif Kiyingi...
    2433-2443页
    查看更多>>摘要：In the application of polymer gels to profile control and water shutoff,the gelation time will directly determine whether the gel can"go further"in the formation,but the most of the methods for delaying gel gelation time are complicated or have low responsiveness.There is an urgent need for an effective method for delaying gel gelation time with intelligent response.Inspired by the slow-release effect of drug capsules,this paper uses the self-assembly effect of gas-phase hydrophobic SiO2 in aqueous solution as a capsule to prepare an intelligent responsive self-assembled micro-nanocapsules.The capsule slowly releases the cross-linking agent under the stimulation of external conditions such as temperature and pH value,thus delaying gel gelation time.When the pH value is 2 and the concentration of gas-phase hy-drophobic SiO2 particles is 10％,the gelation time of the capsule gel system at 30,60,90,and 120 ℃ is 12.5,13.2,15.2,and 21.1 times longer than that of the gel system without containing capsule,respectively.Compared with other methods,the yield stress of the gel without containing capsules was 78 Pa,and the yield stress after the addition of capsules was 322 Pa.The intelligent responsive self-assembled micro-nanocapsules prepared by gas-phase hydrophobic silica nanoparticles can not only delay the gel gelation time,but also increase the gel strength.The slow release of cross-linking agent from capsule provides an effective method for prolongating the gelation time of polymer gels.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Adsorption behavior of CO2/H2S mixtures in calcite slit nanopores for CO2 storage:An insight from molecular perspective

    Cheng QianZhen-Hua RuiYue-Liang LiuKai Du...
    2444-2456页
    查看更多>>摘要：It is acknowledged that injecting CO2 into oil reservoirs and saline aquifers for storage is a practical and affordable method for CO2 sequestration.Most CO2 produced from industrial exhaust contains impurity gases such as H2S that might impact CO2 sequestration due to competitive adsorption.This study makes a commendable effort to explore the adsorption behavior of CO2/H2S mixtures in calcite slit nanopores.Grand Canonical Monte Carlo(GCMC)simulation is employed to reveal the adsorption of CO2,H2S as well as their binary mixtures in calcite nanopores.Results show that the increase in pressure and temperature can promote and inhibit the adsorption capacity of CO2 and H2S in calcite nanopores,respectively.CO2 exhibits stronger adsorption on calcite surface than H2S.Electrostatic energy plays the dominating role in the adsorption behavior.Electrostatic energy accounts for 97.11％of the CO2-calcite interaction energy and 56.33％of the H2S-calcite interaction energy at 10 MPa and 323.15 K.The presence of H2S inhibits the CO2 adsorption in calcite nanopores due to competitive adsorption,and a higher mole fraction of H2S leads to less CO2 adsorption.The quantity of CO2 adsorbed is lessened by approximately 33％when the mole fraction of H2S reaches 0.25.CO2 molecules preferentially occupy the regions near the pore wall and H2S molecules tend to reside at the center of nanopore even when the molar ratio of CO2 is low,indi-cating that CO2 has an adsorption priority on the calcite surface over H2S.In addition,moisture can weaken the adsorption of both CO2 and H2S,while CO2 is more affected.More interestingly,we find that pure CO2 is more suitable to be sequestrated in the shallower formations,i.e.,500-1500 m,whereas CO2 with H2S impurity should be settled in the deeper reservoirs.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Molecular insights into oil detachment from hydrophobic quartz surfaces in clay-hosted nanopores during steam-surfactant co-injection

    Ben-Jie-Ming LiuXuan-Tong LeiMohammadali AhmadiZhangxin Chen...
    2457-2468页
    查看更多>>摘要：Thermal recovery techniques for producing oil sands have substantial environmental impacts.Surfac-tants can efficiently improve thermal bitumen recovery and reduce the required amount of steam.Such a technique requires solid knowledge about the interaction mechanism between surfactants,bitumen,water,and rock at the nanoscale level.In particular,oil sands ores have extremely complex mineralogy as they contain many clay minerals(montmorillonite,illite,kaolinite).In this study,molecular dynamics simulation is carried out to elucidate the unclear mechanisms of clay minerals contributing to the bitumen recovery under a steam-anionic surfactant co-injection process.We found that the clay content significantly influenced an oil detachment process from hydrophobic quartz surfaces.Results reveal that the presence of montmorillonite,illite,and the siloxane surface of kaolinite in nanopores can enhance the oil detachment process from the hydrophobic surfaces because surfactant molecules have a stronger tendency to interact with bitumen and quartz.Conversely,the gibbsite surfaces of kaolinite curb the oil detachment process.Through interaction energy analysis,the siloxane surfaces of kaolinite result in the most straightforward oil detachment process.In addition,we found that the clay type presented in nanopores affected the wettability of the quartz surfaces.The quartz surfaces associated with the gibbsite surfaces of kaolinite show the strongest hydrophilicity.By comparing previous experimental findings with the results of molecular dynamics(MD)simulations,we observed consistent wetting characteris-tics.This alignment serves to validate the reliability of the simulation outcomes.The outcome of this paper makes up for the lack of knowledge of a surfactant-assisted bitumen recovery process and pro-vides insights for further in-situ bitumen production engineering designs.
      原文链接:
    • NETL
    • NSTL
    • 万方数据