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Geological and Engineering‘Sweet Spots'in the Permian Lucaogou Formation,jimusar sag,Junggar Basin

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

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Acid-base alternation diagenesis and its influence on shale reservoirs in the Permian Lucaogou Formation, jimusar sag, Junggar Basin, NW China

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Petroleum Exploration and Development 2020年第5期47卷 962-976页

作者： WANG Jian ZHOU Lu LIU Jin ZHANG Xinji ZHANG Fan ZHANG Baozhen State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Research Institute of Experiment and Detection PetroChina Xinjiang Oilfield CompanyKaramay 834000China School of Geosciences and Technology Southwest Petroleum UniversityChengdu 610500China Research Institute of Exploration and Development PetroChina Xinjiang Oilfield CompanyKaramay 834000China Fengcheng Oilfield Operation Area PetroChina Xinjiang Oilfield CompanyKaramay 834000China

The diagenesis and diagenetic facies of shale reservoirs in Lucaogou Formation of jimusar sag were studied by means of microscopic observation and identification of ordinary thin sections and cast thin sections,X-ray diffraction,scanning electron microscope and electron probe *** results show that alkaline and acidic diagenetic processes occurred alternately during the deposition of Permian Lucaogou Formation in jimusar *** evolution of porosity in the shale reservoirs was influenced by compaction and alternate alkaline and acidic diagenetic processes jointly,and has gone through three stages,namely,stage of porosity reduction and increase caused by alkaline compaction,stage of porosity increase caused by acid dissolution,and stage of porosity increase and reduction caused by alkaline ***,three secondary pore zones developed in Lucaogou *** shale reservoirs are divided into three diagenetic facies:tuff residual intergranular pore-dissolution pore facies,tuff organic micrite dolomite mixed pore facies,and micrite alga-dolomite intercrystalline pore *** wide distribution,good pore structure and high oil content,the first two facies are diagenetic facies of favorable reservoirs in Lucaogou *** research results provide a basis for better understanding and exploration and development of the Lucaogou Formation shale reservoirs.

关键词： acid-base alternation diagenesis porosity evolution shale oil shale reservoir Permian Lucaogou Formation jimusar sag Junggar Basin

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Classification and control factors of pore-throat systems in hybrid sedimentary rocks of jimusar sag, Junggar Basin, NW China

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Petroleum Exploration and Development 2021年第4期48卷 835-849页

作者： XIAO Dianshi GAO Yang PENG Shouchang WANG Meng WANG Min LU Shuangfang Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China Research Institute of Exploration and Development PetroChina Xinjiang Oilfield CompanyKelamayi 834000China

Aiming at the complicated problem of the genesis of high-quality hybrid sedimentary rocks,the pore-throat systems,controlling factors and fluid mobility of hybrid sedimentary rocks in the Permian Lucaogou Formation in jimusar sag were *** results show that the hybrid sedimentary rocks contain 5 types of pore-throat system,intergranular(Type A),mixed intergranular-dissolved-intercrystalline(Type B),dissolved(Type C),mixed dissolved-intercrystalline(Type D)and intercrystalline(Type E)*** pore-throat systems are controlled by 3 major factors,the component content and arrangement(CCA)of hybrid sedimentary rocks,sedimentary environment and *** controls the matrix support mode of hybrid sedimentary rocks,and therefore controls the types and changes of pore-throat *** sedimentary environment mainly controls the macroscopic distribution of pore-throat system,i.e.,hybrid sedimentary rocks deposited in the near source and high-energy environment are characterized by high content of coarse-grained component,granular/interbedded-support mode,and development of Type A and Type B pore-throat *** sedimentary rocks deposited in the medium-energy environment far from source are characterized by dolomitic/mud support mode and Type C and Type D pore-throat *** sedimentary rocks deposited in low-energy environment far from source have mainly Type E and Type D pore-throat *** processes such as compaction and calcite cementation make the proportions of Type A and Type C pore-throat systems decrease *** the hybrid sedimentary process of sandy-mud,pore-throat system types show a change of"A→B→C→D",in that of dolomite-sand,pore-throat system types show a change of"A→C→D→E"or"B→D→E",and in that of dolomite-mud,pore-throat system types show a change of"D→E",which are affected in details by the contents of coarse-grain component,feldspar and *** reservoir with Type A pore-throats has the best physical properti

关键词： pore throat system pore throat types evolution fluid mobility hybrid sedimentary rock Permian Lucaogou Formation jimusar sag Junggar Basin

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Genesis of granular calcite in lacustrine fine-grained sedimentary rocks and its indication to volcanichydrothermal events: A case study of Permian Lucaogou Formation in jimusar sag, Junggar Basin, NW China

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Petroleum Exploration and Development 2023年第3期50卷 615-627页

作者： LI Ke XI Kelai CAO Yingchang WANG Youcheng LIN Miruo Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China

Granular calcite is an authigenic mineral in fine-grained sedimentary *** observation,thin section observation,cathodoluminescence analysis,fluid inclusion analysis,scanning electron microscope(SEM),and isotopic composition analysis were combined to clarify the genesis of granular calcite in the lacustrine fine-grained sedimentary rocks of the Permian Lucaogou Formation in the jimusar sag,Junggar *** is found that the granular calcite is distributed with laminated characteristics in fine-grained sedimentary rocks in tuffite zones(or the transitional zone between tuffite and micritic dolomite).Granular calcite has obvious cathodoluminesence band,and it can be divided into three ***-Ⅰ calcite,with non-luminesence,high content of Sr element,inclusions containing Cos,and homogenization temperature higher than 170℃,was directly formed from the volcanic-hydrothermal ***-Ⅱ calcite,with bright yellow luminescence,high contents of Fe,Mn and Mg,enrichment of light rare earth elements(LREEs),and high homogenization temperature,was formed by recrystallization of calcareous edges from exhalative hydrothermal ***-IlI calcite,with dark orange luminescence band,high contents of Mg,P,V and other elements,no obvious fractionation among LREEs,and low homogenization temperature,was originated from diagenetic transformation during *** granular calcite appears regularly in the vertical direction and its formation temperature decreases from the center to the margin of particles,providing direct evidences for volcanic-hydrothermal events during the deposition of the Lucaogou *** volcanic-hydrothermal event was conducive to the enrichment of organic matters in fine-grained sedimentary rocks of the Lucaogrou Formation,and positive to the development of high-quality source *** volcanic-hydrothermal sediments might generate intergranular pores/fractures during the evolution,creating conditions for the self-generation and sel

关键词： fine-grained sedimentary rocks calcite origin volcanic-hydrothermal event event deposition Permian Lucaogrou Formation jimusar sag Junggar Basin

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Hydrothermal-sedimentary dolomite—A case from the Middle Permian in eastern Junggar Basin,China

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Journal of Palaeogeography 2020年第4期9卷 415-437页

作者： Shuai Zhang Yi-Qun Liu Hong Li Xin Jiao Ding-Wu Zhou State Key Laboratory of Continental Dynamics Northwest UniversityXi'an 710069Shaanxi ProvinceChina Department of Geology Northwest UniversityXi'an 710069Shaanxi ProvinceChina Key Laboratory of Alpine Ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The Middle Permian Lucaogou Formation in the jimusar sag,eastern Junggar Basin,NW China,was deposited in a salt lake within an intracontinental rift basin with intense hydrothermal ***-sedimentary dolomite in the form of three types of dolostones,namely,analcime-feldspar dolostone(AFD),silicic dolostone(SD)and buddingtonite-albite dolostone(BAD),related to syn-sedimentary hydrothermal activity at lake bottom was *** characteristics and formation mechanism of the dolomite were studied based on micron-scale petrographic and isotopic geochemical *** syn-depositional formation of these dolostones was indicated by their rock-mineral features and syn-sedimentary deformation *** dolomite was composed of relatively poorly ordered proto-dolomite crystals with micron-sized spherical or sub-spherical morphology and coexisted with hydrothermal minerals,including analcime,buddingtonite,albite and *** clasts were replaced by the dolomite,indicating high-temperature conditions during *** remarkably low strontium isotopic compositions of the dolostones(87Sr/86Sr with an average of 0.705687)indicated that mantle-derived materials might have involved in the ore-forming *** dolostones had positiveδ13CPDB values(with an average of 6.94‰)and negativeδ18OPDB values(with an average of-8.12‰).Based on theδ18OPDB values,the formation temperatures of the dolomite were at least^25ºC higher than those of the penecontemporaneous dolomite in the Lucaogou Formation in the study *** is concluded that the dolomite precipitated from hydrothermal fluid erupting at the lake *** possible genetic models are *** suggest that the hydrothermal-sedimentary dolomite is an important genetic type,and this study may help increase the awareness of this understudied type of dolomite.

关键词： Dolomite genesis Hydrothermal sedimentary dolomite Permian Lucaogou Formation jimusar sag Junggar Basin

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