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Thin bed responses and correction methods for cased hole density logging

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petroleum Science 2008年第4期5卷 322-325页

作者： wu Wensheng zhang Yuling State key laboratory of {2. resource and Prospecting China University of Petroleum Beijing 102249 China china National Logging Corporation CNPC Beijing 100101 China

The study of the thin bed responses and correction methods in cased hole density logging can provide a theoretical basis for research to improve data processing methods. By using the Monte Carlo program MCNP, the change of detector count from thin beds with the vertical depth was calculated at different casing thicknesses. The calculation showed that with the low density thin bed moving upward, detector count first increased to a maximum then decreased. The responses of a thin bed with a high density were opposite to those of a thin bed with a low density. The change curve was symmetrical, and the maximums or minimums appeared at the midpoint between the detector and source. Besides, detector count increased with increasing thin bed thickness. At a specific thin bed thickness, further increase of thin bed thickness resulted in a slow increase of detector count then the count rate leveled off. In actual logging, the influence of adjacent formations on density log measurements can be ignored. Finally, based on numerical simulation correction methods for the dual influence of casing and thin beds are discussed.

关键词： Density logging in cased hole thin bed response casing MCNP program correcting

From deep basin gas to diagenetic trap—An example from the Yulin Gas Field in the Ordos Basin

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chinese Science Bulletin 2007年第21期52卷 2973-2983页

作者： zhang liuping {2. xiaorong ma xinhua chen mengjin wu minghui key laboratory of {2. resource Chinese Academy of Sciences Beijing 100029 China Research Institute of petroleum Exploration and Development PetroChina Beijing 100083 China

In the updip portion of the Yulin Gas Field in the Ordos Basin, there are no any structural, stratigraphic and sedimentary lithologic seals. Using thin-section petrography, ultraviolet fluorescence microscopy, micro-thermometry and Raman microspectrometry, this paper finds out the diagenetic trap and studies the diagenetic history of this field. It was revealed that three phases of diagenesis and hydrocarbon charging happened in late Triassic, late Jurassic and the end of early Cretaceous respectively. In the first two phases, acid geofluid entered the reservoir and caused dissolution and cementation. Although the porosities had been increased, further compaction accompanying re-subsidence resulted in tight sandstone and conglomerates. Till the end of the early Cretaceous, bulk of gas migrated into the tight reservoir. Cementation, however, kept on in the updip portion of this field due to low gas saturation and formed the diagenetic trap. The mechanism for gas accumulation was changed from deep basin gas to diagenetic trap, which offers a sealing condition that can retain gas for much longer time.

关键词：天然气气田储气量天然气开发

Wave characteristics and tectonic-sedimentation evolution of foreland thrust fault of Micang Mountain

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Science china Earth sciences 2008年第S2期51卷 70-77页

作者： LI RuFeng1,2.3,GUO TongLou4,chen GuoFei1 & zhang GangXiong1 1 State {2. laboratory of petroleum resource and Prospecting,china University of petroleum,beijing 102.49,china 2.{2. laboratory for Hydrocarbon Accumulation Mechanism,china University of petroleum,Ministry of Education,beijing 102.49,china 3 Basin and Reservoir Research Center,china University of petroleum,beijing 102.49,china 4 SINOPEC Southern E & P Company,chengdu 610041,china State key laboratory of {2. resource and Prospecting China University of Petroleum Beijing 102249 China key laboratory for Hydrocarbon Accumulation Mechanism China University of Petroleum Ministry of Education Beijing 102249 China [

In this paper,the technology of wave process method for sedimentation is first adopted in the research of the foreland thrust fault of Micang Mountain with respect of oil and reservoir’s formation and tectonic and sedimentary evolution. From the fluctuation characteristics,we could make conclusions in the foreland thrust belt of Micang Mountain that,there existed 2.first-order sedimentary cycles (2.0 ma),corresponding to Caledonian-Hercynian and Indo-chinese-Yanshan-Himalayan tectonic cycles respec-tively; there existed 4 second-order sedimentary cycles (10 ma),corresponding to two sedimentation peak period and two denudation peak periods in research zone; there existed 12.third-order sedimen-tary cycles (35 ma) and 2. fourth-sedimentary cycles (2. ma). These 33 cycles in the research zone corresponded to the sedimentation-denudation process in different periods,furthermore,their fluctua-tion characteristics bore the genetic relationship with the development law of source,reservoir and cap rocks: the source rock had the tendency to develop at the turning part between wave crest and wave trough,or at the superposition of wave turning part in different periods,presenting like "X"; most res-ervoir rocks developed at the place of wave peak; the development of cap rock was located in the wave trough on the right of sedimentation-denudation datum line. As a result,through the application of wave process method for sedimentation,we could rediscover the understanding of the tectonic and sedimentary evolution from another prospective,meanwhile,it enables to make prediction about the development rule of source,reservoir and cap rocks,which means a significant importance to the re-search of oil and reservoir’s forming condition.

关键词： foreland thrust belt of Micang Mountain sedimentation wave process wave cycle tectonic and sedimentary evolution forming condition

From deep basin gas to diagenetic trap—An example from the Yulin Gas Field in the Ordos Basin

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From deep basin gas to diagenetic trap—An example from the ...

An analysis of the types and distribution characteristics of natural gas reservoirs in china

中国科学院地质与地球物理研究所2.07学术年会

作者： zhang liuping~(1+),luo xiaorong~1,{2.,chinese Academy of sciences,beijing 100029.china 2.Research Institute of petroleum Exploration and Development,Petrochina,beijing 100083,china

In the updip portion of the Yulin Gas Field in the Ordos Basin,there are no any structural,stratigraphic and sedimentary lithologic *** thin-section petrography,ultraviolet fluorescence microscopy, micro-thermometry and Raman microspectrometry,this paper finds out the diagenetic trap and studies the diagenetic history of this *** was revealed that three phases of diagenesis and hydrocarbon charging happened in late Triassic,late Jurassic and the end of early Cretaceous *** the first two phases,acid geofluid entered the reservoir and caused dissolution and *** the porosities had been increased,further compaction accompanying re-subsidence resulted in tight sandstone and *** the end of the early Cretaceous,bulk of gas migrated into the tight ***,however,kept on in the updip portion of this field due to low gas saturation and formed the diagenetic *** mechanism for gas accumulation was changed from deep basin gas to diagenetic trap,which offers a sealing condition that can retain gas for much longer time.

关键词： natural gas deep basin gas tight reservoir diagenetic trap Ordos Basin

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petroleum Science 2009年第1期6卷 38-42页

作者： Xu zhangyou Yue Dali wu Shenghe zhang Xiaoyu chen Ce Ni Yuqiang School of resources and Information Technology China University of Petroleum Beijing 102249 China State key laboratory of {2. resource and Prospecting China University of Petroleum Beijing 102249 China

The natural gas reservoir beds of different areas in china can be divided into three kinds, clastic natural gas reservoir bed, carbonate natural gas reservoir bed and special natural gas reservoir bed. They have different combination patterns controlled by deposition, diagenesis and tectonism. Our analysis indicates that the natural gas reservoirs are mainly distributed in the Precambrian, Palaeozoic, Mesozoic, and Tertiary-Quaternary. Craton basin, foreland basin and intracontinental rift basin which contain most of natural gas in china have special geological features and favorable accumulation conditions, and will be important exploration areas in the future.

关键词： Natural gas clastic reservoir carbonate reservoir gas-bearing basin china

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Science china Earth sciences 2004年第10期47卷 896-911页

作者： zhang Changhou1,2. wu Ganguo1,2. WANG Genhou2. zhang Weijie2.& SONG Honglin2.1. key laboratory of Lithospheric Tectonics and Lithoprobing Technology, china University of Geosciences, Ministry of Education of china, beijing 100083, china 2. School of Earth sciences and Mineral {12.s, china University of Geosciences, beijing 100083, china 1. key laboratory of Lithospheric Tectonics and Lithoprobing Technology China University of Geosciences Ministry of Education of China 100083 Beijing China 2. School of Earth sciences and Mineral resources China University of Geosciences 100083 Beijing China

The northwest trending tectonic belt in the middle part of the Mesozoic intraplate Yanshan Orogenic Belt, northeast Hebei Province, is composed of thrusts, extensional faults, strike-slip faults and syntectonic sedimentations as well. The northeastward basement-involved major thrusting deformation occurred between 174ma and 168maBP and was followed by an intrusion of the granitic plutonic rocks. As a part of the post-thrusting extensional deformations a northwest extending volcano-sedimentation system of Late Jurassic and Early Cretaceous formed in the southwest side of the belt. These volcano-sedimentary sequences are divided into Tuchengzi Formation, zhangjiakou Formation, Yixian Formation and Jiufotang Formation re- spectively. They are characterized by southeastward migration as a result of the increasing down-dip slip displacement along the major extensional fault toward the southeast of the belt. The provenance area of the Jiufotang Formation north to it experienced southwestward thrusting during and after its later sedimentation. The thrusting in this stage resulted in the formation of an asymmetric footwall syncline with vergence to SW in the Jiufotang Formation in the NE side of the basin. Finally a dextral strike-slip deformation occurred along the NW tectonic belt. The striking tectono-geomorphological features and present seismic activities along this belt indicate that it has been being active since Cenozoic era and is still in the active state at present. This northwest extending tectonic belt was following the same direction and location as the existing fault systems within the basement as revealed by former geological and geophysical studies. So it is reasonable to infer the Mesozoic deformation along this belt to be a result of reactivation of the basement structures in a favorable tectonic stress field. The reactivation of basement struc- tures might be taken as one of the mechanisms of intraplate deformation and orogeny.

关键词： Yanshan Orogenic Belt, northwest extending tectonic complex, thrust system, geochronology.

Spectroscopic study of globular clusters in the halo of M31 with the Xinglong 2.16 m telescope

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Research in Astronomy and Astrophysics 2011年第11期11卷 1298-1310页

作者： Zhou Fan1,2.Ya-Fang Huang1,2.Jin-Zeng Li1,2.Xu Zhou1,2.Jun ma1,2.Hong wu1,2.Tian-Meng {2.1,2.and Yong-Heng Zhao1,2.1 National Astronomical Observatories,chinese Academy of sciences,beijing 100012.china 2.key laboratory of Optical Astronomy,National Astronomical Observatories,chinese Academy of sciences,beijing 100012.china National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China key laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

We present spectroscopic observations for 11 confirmed globular clusters(GCs) of M31 with the OMR spectrograph on the 2.16 m telescope at the Xinglong site of National Astronomical Observatories,chinese Academy of *** of our sample clusters are located in the halo of M31 and the most remote one is out to a projected radius of 78.75 kpc from the galactic *** all our sample clusters,we measured the Lick absorption-line indices and radial *** is noted that most GCs in our sample are distinct from the HI rotation curve of galaxy M31,especially for B514,MCGC5,H12.and B517,suggesting that most of our sample clusters do not have a kinematic association with the star-forming young disk of the *** separately fitted the absorption line indices from the updated stellar population model of Thomas et *** two different tracks of Cassisi and Padova,by applying the χ2.minimization *** fitting results show that all our sample clusters are older than 10 Gyr,and metal-poor(2.38 ≤ [Fe/H] ≤ 0.91 dex).After merging the spectroscopic metallicity of our work with the previously published ones,we extended the cluster sample out to a projected radius of 117 kpc from the galaxy's *** found the metallicity gradient exists for all the confirmed clusters with a slope of 0.02. ± 0.001 dex kpc ***,the slope turns out to be 0.018 ± 0.001 dex kpc 1 for all the halo clusters,which is much *** we only consider the outer halo clusters with rp > 2. kpc,the slope becomes 0.010 ± 0.002.dex kpc 1 and if one cluster G001 is excluded from the outer halo sample,the slope is 0.004 ± 0.002.dex kpc ***,we conclude that the metallicity gradient for M31's outer halo clusters is not significant,which agrees well with previous findings.

关键词： galaxies individual(M31) — galaxies star clusters — globular clusters general — star clusters general

Insight into the capacity degradation and structural evolution of single-crystal Ni-rich cathodes

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Journal of Energy Chemistry 2024年第8期95卷 68-76,I0003页

作者： Xiaodong zhang Jiao Lin Ersha Fan Qingrong Huang Su ma Renjie {2. Feng wu Li Li beijing key {2. of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Advanced Technology Research Institute Beijing Institute of TechnologyJinan 250300ShandongChina Collaborative Innovation Center of Electric Vehicles in beijing Beijing 100081China

Single-crystal Ni-rich cathodes are a promising candidate for high-energy lithium-ion batteries due to their higher structural and cycling stability than polycrystalline ***,the phase evolution and capacity degradation of these single-crystal cathodes during continuous lithation/delithation cycling remains *** the mapping relationship between the macroscopic electrochemical properties and the material physicochemical properties is ***,we investigate the correlation between the physical-chemical characteristics,phase transition,and capacity decay using capacity differential curve feature identification and in-situ X-ray spectroscopic *** systematically clarify the dominant mechanism of phase evolution in aging *** high cut-off voltages can mitigate the slow kinetic and electrochemical properties of single-crystal *** also find that second-order differential capacity discharge characteristic curves can be used to identify the crystal structure disorder of Ni-rich *** findings constitute a step forward in elucidating the correlation between the electrochemical extrinsic properties and the physicochemical intrinsic properties and provide new perspectives for failure analysis of layered electrode materials.

关键词： Single-crystal cathodes Capacity decay Phase transition Differential capacity analysis

Total alkyl dibenzothiophenes content tracing the filling pathway of condensate reservoir in the Fushan Depression,South china Sea

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Science china Earth sciences 2008年第S2期51卷 138-145页

作者： LI MeiJun1,WANG TieGuan1,LIU Ju2.zhang MeiZhu2.LU Hong3,ma QinLin{2. GAO LiHui2.1 State key laboratory of petroleum resources and Prospecting,Earth sciences and Geoinformatics School,china University of petroleum,beijing 102.49,china 2.Southern Oil Exploration and Development Company,Petrochina,Guangzhou 510640,china 3 Guangzhou Institute of Geochemistry,chinese Academy of sciences,Guangzhou 5102.0,china china Univ Petr Earth Sci & Geoinformat Sch State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China Petrochina So Oil Explorat & Dev Co Guangzhou 510640 Peoples R China chinese Acad Sci Guangzhou Inst Geochem Guangzhou 510240 Guangdong Peoples R China

The condensates are generally characterized by high maturity,low concentration of steranes and ter-panes biomarkers and low content of non-hydrocarbon fraction. In this case commonly used steranes,terpanes and carbazoles parameters cannot be effectively applied in the reservoir-filling tracing. The hydrogen bond formed by sulfur atom in the dibenzothiophenes (DBTs) results in molecule adsorption and fractionation during oil migration in reservoir. Like carbazoles,total DBTs content decreases with the increasing of oil migration distance. Therefore,a new parameter——total DBTs content is proposed to be used to trace the oil migration orientation and filling pathway. In present study,total DBTs con-tents of condensates and light oils are obtained by adding internal standard——eight deuterium atoms substituted DBT during Gas Chromatography-mass Spectrometry analysis of aromatic fraction. Except for a few samples with much lower content of non-hydrocarbon fraction,the total DBTs content shows a fine positive correlation with that of carbazoles. Large errors can be caused in the process of pyrrolic nitrogen compounds separation. The application of this new parameter in the Fushan Depression of Beibu Gulf Basin,South china Sea indicates that this parameter is a reliable one to trace filling pathway in condensate reservoirs. Combined with other DBTs-related parameters,such as 4-/1-methydibenzo-thiophene and 2.4-/1,4-dimethyldibenzothiophene,oil migration orientation and filling pathway of the Fushan Depression was determined. The accumulations of Huachang oil field in the Fushan Depres-sion are mainly migrated and charged from northeast to southeast along the Huachang uplift. It can be predicated that the light oil and condensates in the Huachang oil field should be sourced from the source kitchen at the Bailian Sag. It shows that total DBTs content is an effective parameter to tracing oil migration orientation and filling pathway.

关键词： dibenzothiophene alkyl dibenzothiophene condensate reservoir filling pathway molecular markers the Fushan Depression