期刊,Journal of Petroleum Science & Engineering 2022年208PC卷期_国家学术搜索

期刊信息/Journal information

Journal of Petroleum Science & Engineering

Elsevier Science B.V.

主办单位：Elsevier Science B.V.

国际刊号：0920-4105

Journal of Petroleum Science & Engineering/Journal Journal of Petroleum Science & Engineering

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Enhanced interpretation of strike-slip faults using hybrid attributes:Advanced insights into fault geometry and relationship with hydrocarbon accumulation in Jurassic formations of the Junggar Basin

Lijie CuiKongyou WuQiang Liu

17页

查看更多>>摘要：Strike-slip faults can play an important role in hydrocarbon accumulation.Therefore advanced studies on the interpretation of intra-basinal strike-slip faults are crucial.Hybrid attributes computed from conditioned 3D seismic data via artificial neural networks may enhance subsurface fault images.Jurassic formations within the C36 3D Prospect located in the Central Depression of the Junggar Basin are important to hydrocarbon accumulation.However,the geometry of strike-slip faults and their relationship with hydrocarbon accumulation are inadequately understood.The present study highlights these strike-slip faults using 3D seismic data from the C36 3D Prospect.Several conditioning approaches have enabled enhanced imaging of the strike-slip faults using computed hybrid attributes.They are based on implementing a dip-steering cube extracted from the original seismic data,along with analyses of multiple seismic attributes and a supervised neural network.Analysis of the hybrid attributes reveals the development of isolated,soft-linked,hard-linked,and coalesced faults along an approximately NE-SW trend.Various types of interactions were observed between the upper and lower fault systems.The different types of vertical linkages between the strike-slip faults provide hydrocarbon migration paths and thus,contribute differently to hydrocarbon migration.

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Lithofacies types,reservoir characteristics,and hydrocarbon potential of the lacustrine organic-rich fine-grained rocks affected by tephra of the permian Lucaogou formation,Santanghu basin,western China

Yongshuai PanZhilong HuangXiaobo Guo

17页

查看更多>>摘要：Volcanisms were widespread during the Permian periods in the Santanghu Basin.However,information on the classification of the lithofacies of the Lucaogou Formation(Lucaogou Fm)is still lacking,and the hydrocarbon potential of the organic-rich fine-grained rocks(FGRs)remains uncertain.Therefore,this study determines the lithofacies classification standard of the Lucaogou Fm FGRs,clarifies the advantageous lithofacies types,and evaluates the unconventional resource potential based on organic geochemical analysis,macroscopic core observation,core routine test,rock mineral identification,and pore structure characterization.The Lucaogou Fm FGRs are mainly composed of felsic minerals and dolomite,which can be divided into four rock types with high organic matter(OM)content and laminated structure.Based on TOC,rock type,and sedimentary structure,ten types of lithofacies were determined:organic-rich massive tuff(ORMT),organic-medium massive tuff(OMMT),organic-medium massive dolomite(OMMD),organic-poor massive dolomite(OPMD),organic-rich laminated tuffaceous dolomite(ORLTD),organic-medium laminated tuffaceous dolomite(OMLTD),organic-poor laminated tuffaceous dolomite(OPLTD),organic-rich laminated dolomitic tuff(ORLDT),organic-medium laminated dolomitic tuff(OMLDT),organic-poor laminated dolomitic tuff(OPLDT).There is a large amount of algal OM in the Lucaogou Fm FGRs because of the deposition of tephra,but they seriously hinder the development of pore space and the flow of pore fluid due to the relatively low maturity,resulting in poor pore structure and fluid mobility.Among them,ORMT,OPMD,OMMT,and OMMD have been transformed by diagenesis,with various types and scales of pore space,and obviously good physical properties,oiliness,pore structure,as well as fluid mobility.Followed by OPLTD,ORLTD,and OMLTD,while OPLDT,OPLDT,and OMLDT are the worst.The advantageous lithofacies of the Lucaogou Fm FGRs are influenced by both rock types and OM abundance,and are also related to sedimentary structures.In addition,the Lucaogou Fm FGRs have a large thickness,high-quality OM,high content of brittle minerals,low content of clay minerals,developed micro-nanopores network,and certain producible oil,indicating that they have significant hydrocarbon potential.

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NSTL

Influence of mechanical contrast between the matrix and gravel on fracture propagation of glutenite

Jiantong LiuHongkui GeZhenxin Zhang

11页

查看更多>>摘要：Glutenite is composed of gravel,matrix and their cementing surface in meso-scale.The fracture propagation in it is therefore different from the fine-grained rocks such as shale and sandstone.In order to study the influence of mechanical contrast between the matrix and gravel on fracture propagation and mechanical properties of glutenite,three-point bending tests on semi-circular samples were performed.The results of three-point bending indicate that not all glutenite was enhanced by gravel on fracture toughness.Therefore,we classified the glutenite into gravel-enhanced and gravel-weakened.In gravel-enhanced glutenite,gravel increases the fracture toughness of the glutenite,and the fracture is characterized by deflection when it hits the gravel.In gravel-enhanced glutenite,the fracture is single and tortuous when gravel content is less than 35 % and bifurcate and tortuous when gravel content is more than 35 %.As for the gravel-weakened glutenite,gravel reduces fracture toughness of glutenite,and the fracture penetrates the gravel when it hits gravel,which leads to a single and flat fracture.The enhancing or weakening effect of gravel is caused by the mechanical contrast between the matrix and gravel.In gravel-enhanced glutenite,the hardness of gravel is higher than that of the matrix,and the gravel prevents fracture from propagating.While in gravel-weakened glutenite,there are large amounts of weak gravels whose hardness is lower than that of the matrix.Instead of preventing the fracture from propagating,the weak gravels are penetrated.Gravel content and support pattern also have an important effect on the mechanical properties of glutenite.When gravel content is less than 35 %,the gravel is not in contact with each other,the supporting phase is the matrix,and the mechanical properties of glutenite are therefore mainly controlled by the matrix.When gravel content rises above 35 %,gravel begins to contact with each other,and the contacted gravel forms a skeleton bearing the external load.In this case,the supporting phase changes from the matrix to gravel,resulting in a drastic variation of elastic modulus of glutenite as gravel content increases.According to gravel content and the hardness contrast between the matrix and gravel,glutenite was subdivided into four types.The main controlling factors of fracture propagation of the four types were clarified.This classification is of great significance in guiding hydraulic fracturing for different glutenite reservoirs.

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NSTL

Does grain size influence hydrocarbons generation and mesoporosity during artificial thermal maturation of an organic-rich mudstone?

Amelie CavelanMohammed Boussafir

8页

查看更多>>摘要：To assess how the grain size/rock fabric of laboratory-matured shale samples impact oil,gas production,and the formation of pores during laboratory thermal maturation,cores(4.5 mm*1 cm)of bulk rock,millimetric equi-dimensional rock fragments(3*3 mm),and fine grind powder(<200 urn)were obtained from an organic-rich mudstone(Kimmeridge Clay Fm."KCF",Yorkshire,UK)and artificially matured under anhydrous conditions.The composition of the organic matter(OM),porosity,and thermal maturity were characterized using nitrogen adsorption,Rock-Eval~R VI pyrolysis,GC/TCD(Gas-Chromatography/Thermal Conductivity Detector),and GC/MS(Gas Chromatography/Mass Spectrometry).While only a few differences in geochemical composition and porosity exist between rock fragments and powders,a greater gap is observed with the cores.Probably due to lower surface contact between the organic components themselves and clay mineral surfaces(which can act as a catalyst of oil and gas generation)less intense OM thermal degradation processes were observed for the cores.The use of cores rather than powder and fragments results in:(i)the production of lower extractible OM concentrations;(ii)lower amounts of gas(C1-C5 and CO2);(iii)lower pore volumes and smaller pore sizes during maturation.This preliminary work highlights the importance of considering the fabric of the rock being artificially matured and shows that the use of cores with an intact rock fabric(e.g.cores),closer to natural conditions,could be more suitable when studying OM thermal degradation and porosity.In comparison with previous works,this also demonstrated that depending on the maturation system used(e.g.semi-confined,confined)the differences in the amount of hydrocarbons generated and porosity observed between powder and cores during maturation could differ significantly and find their origin in different processes.

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NSTL