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Geochemical characterization of aromatic hydrocarbons in crude oils from the Tarim,Qaidam and Turpan Basins,NW china

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Petroleum Science 2010年第4期7卷 448-457页

作者： Zhang Min Paul Philp Department of Geochemistry Yangtze University Jingzhou Hubei 434023 China The key laboratory of oil ＆ gas resources and exploration technology Ministry of Education Yangtze University Jingzhou Hubei 434023 China School of Geology and Geophysics University of Oklahoma Norman OK 73019 USA

Based on the systematic study of aromatic hydrocarbons in over 100 crude oil samples collected from the Tabei and Tazhong uplifts in the Tarim Basin,the western depression area in the Qaidam Basin and the Tabei depression in the Turpan Basin,the geochemical characteristics of the marine（Tarim Basin）,saline lacustrine（Qaidam Basin）,and swamp（Turpan Basin） oils were *** marine oils from the Tarim basin are characterized by relatively low abundance of diaromatic hydrocarbons such as biphenyl and naphthalene,and relatively high abundance of triaromatic hydrocarbons including phenanthrene,dibenzothiophene and *** contrast,the swamp oils from the Turpan Basin are dominated by the highest relative abundance of diaromatic hydrocarbons and the lowest relative abundance of triaromatic hydrocarbons in all the oil samples in this *** relative abundance of diaromatic and triaromatic hydrocarbons in the saline lacustrine oils from Qaidam Basin is between that in Tarim oils and Turpan *** parameters based on the isomer distributions of dimethylnaphthalenes（DMN）,trimethylnaphthalenes（TMN）,tetramethylnaphthalenes（TeMN） and methylphenanthrenes（MP）,i.e.,1,2,5-trimethylnaphthalene（TMN）/1,3,6-TMN ratio,1,2,7-TMN/1,3,7TMN ratio,（2,6-＋2,7-）-dimethylnaphthalenes（DMN）/1,6-DMN ratio,1,3,7-TMN/（1,2,5-＋1,3,7-）TMN,1,3,6,7-TeMN/（1,3,6,7-＋1,2,5,6-＋1,2,3,5-）-TeMN ratio and MP index,may reflect the diversity of organic source input,thermal maturity and depositional *** addition,the dibenzothiophenes（DBTs）/fluorenes（Fs） and dibenzofurans（DBFs）/Fs ratios were found to the very useful and effective in determining genetic types of crude oils for the marine,saline lacustrine,and swamp depositional environments,and for oil-oil correlations.

关键词： china Tarim Basin Qaidam Basin Turpan Basin marine oil saline lacustrine oil coal-derived oil depositional environment aromatic hydrocarbons

Application of backflush and micro-flow techniques to the analysis of C5—C13 hydrocarbons in crude oils and its geochemical significance

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Progress in Natural Science:Materials International 2007年第11期17卷 1382-1387页

作者： Wang Peirong1,2, Zhao Hong2,3, Xu Guanjun1,4, Zhu Cuishan2,3, Xiao Tingrong4, Zhang Min2,3 and Zhang Bin1,4(1. key laboratory of Petroleum Geochemistry, china National Petroleum Corporation, Beijing 100083, china 2. Geochemistry Department of yangtze university, jingzhou 434023, china 3. key laboratory of exploration Technologies for oil and gas resources, ministry of education, yangtze university, jingzhou 434023, china 4. Petroleum Geology Central laboratory, Research Institute of Petroleum exploration and Development, Petrochina, Beijing 100083, china) key laboratory of Petroleum Geochemistry China National Petroleum Corporation Beijing 100083 China Geochemistry Department of yangtze university Jingzhou 434023 China key laboratory of exploration Technologies for oil and gas resources Ministry of Education Yangtze University Jingzhou 434023 China Petroleum Geology Central laboratory Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China

An Agilent 6890N GC equipped with both FID and Agilent 5975 MSD analyzer has been employed to analyze C5—C13 hydrocarbon fractions of crude oils. A technical combination of program temperature volatilizer injection, backflush and micro-flow controller afforded a fine separation of C5—C13 compounds on a PONA column with the heavy part of crude oils being cut off before entering the analytical column. Both GC-FID chromatogram and GC-MS mass chromatograms (MID and full scan) could be obtained at the same time. The retension time differences of nC6—nC13 alkanes between GC and TIC were in the range of 0.02—0.58 minutes. Totally 286 peaks have been assigned group compositions. Results on 8 typical oil samples from CNPC key laboratory Crude oil Library showed that the characteristics of C6—C13 hydrocarbon group composition could be used in oil-oil correlation studies.

关键词： GC analysis GC/MS analysis backflush micro-flow controller light fraction in crude oil

The effects of biodegradation on the compositions of aromatic hydrocarbons and maturity indicators in biodegraded oils from Liaohe Basin

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Science china Earth Sciences 2009年第S1期52卷 59-68页

作者： BAO JianPing & ZHU CuiShan key laboratory of oil & gas Resource and exploration technology,ministry of education Geochemistry Department,yangtze university,jingzhou 434023,china 1. key laboratory of oil & gas Resource and exploration technology Ministry of Education Geochemistry Department Yangtze University Jingzhou 434023 China

By the aid of GC-MS technique,a series of sequentially biodegraded oils from Liaohe Basin have been analyzed. The results show that the concentrations and relative compositions of various aromatic compounds in the biodegraded crude oils will change with increasing biodegradation degree. The concentrations of alkyl naphthalenes,alkyl phenanthrenes,alkyl dibenzothiophene are decreased,and the concentration of triaromatic steroids will increase with increasing biodegradation degree in biodegraded oils. Those phenomena indicate that various aromatic compounds are more easily biodegraded by bacteria like other kinds of hydrocarbons such as alkanes,but different series of aromatic compounds have a varied ability to resistant to biodegradation. The ratios of dibenzothiophene to phenenthrene(DBTH/P) and methyl dibenzothiophene to methyl phenanthrene(MDBTH/MP) are related to the features of depositional environment for source rocks such as redox and ancient salinity. However,in biodegraded oils,the two ratios increase quickly with the increase of the biodegradation degree,indicating that they have lost their geochemical significance. In this case,they could not be used to evaluate the features of depositional environment. Methyl phenanthrene index,methyl phenanthrene ratio and methyl dibenzoyhiophene ratio are useful aromatic maturity indicators for the crude oils and the source rocks without vitrinite. But for biodegraded oils,those aromatic maturity indicators will be affected by biodegradation and decrease with the increase of the biodegradation degree. Therefore,those aromatic molecular maturity indicators could not be used for biodegraded oils.

关键词： biodegraded oils alkyl phenanthrenes alkyl dibenzothiophenes aromatic maturity indicator Liaohe Basin

The effects of biodegradation on biomarker maturity indicators in sequentially biodegraded oils from Liaohe Basin,china

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Science china Earth Sciences 2009年第S1期52卷 42-50页

作者： BAO JianPing & ZHU CuiShan key laboratory of oil & gas Resource and exploration technology,ministry of education,Geochemistry Department,yangtze university,jingzhou 434023,china 1. key laboratory of oil & gas Resource and exploration technology Ministry of Education Geochemistry Department Yangtze University Jingzhou 434023 China

By aid of gas chromatogram/mass spectrometry(GC-MS) ,the distributions and the compositions of biomarkers in a set of sequentially biodegraded oils from Liaohe Basin,china,have been quantitatively analyzed,and it has been found that during the biodegradation process of crude oils,the molecular maturity parameters such as Ts/Tm,homohopane C31 22S/(22S+22R) and sterane C29 20S/(20S+20R) ratios will be affected to different extent. The results show that except homohopane C31 22S/(22S+22R) ratio,Ts/Tm ratio will decrease with increasing biodegradation,but for C29 20S/(20S+20R) ratio,it will almost remain constant in slightly and moderately biodegraded oils,and then will increase quickly in severely biodegraded oils. The main reason is that there are some differences in the ability of resistant biodegradation for different isomer of biomarkers with different stereo configuration,resulting in the fact that destroying rate by bacteria for those biomarkers with weak ability will be higher than those with strong ability in resistant biodegradation. For example,18α(H) -22,29,30-trisnorhopanes(Ts) will be destroyed more quickly than 17α(H) -22,29,30-trisnorshopanres(Tm) ,and 20R isomer is more quickly than 20S isomer for C29 sterane,resulting in the relative ratios changed with increasing biodegradation. Therefore,much more attention should be paid to the biodegradation extent of crude oils and the type of biomarker maturity indicators,when the distributions and the compositions of biomarkers in biodegraded oils are used to determine the maturity of biodegraded oils.

关键词： biodegraded oils sterane hopane biomarkers maturity parameters Liaohe Basin

Abnormal high pressure in Kuqa foreland thrust belt of Tarim basin: Origin and impacts on hydrocarbon accumulation

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Progress in Natural Science:Materials International 2006年第12期16卷 1307-1314页

作者： ZENG Lianbo~1** and LIU Benming~ 1,2 (1. key laboratory of Hydrocarbon Accumulation in china Petroleum university, ministry of education, Beijing 102249, china 2. The Institute of oil and gas exploration and Development, Tarim oilfield Company, Petrochina Company Limited, Korla 841000, china) [a]ministry of education Key Laboratory of Hydrocarbon Accumulation in China Petroleum University Beijing China [b]The Institute of oil and gas exploration and Development Tarim Oilfield Company PetroChina Company Limited Korla China

Following analyses of the abnormal high pressure distribution characteristics, based on the geological characteristics, tectonic stress field and physical simulation, we investigated the formation mechanisms of abnormal high pressure and its impacts on hydrocarbon accumulation in the Kuqa foreland thrust belt. The abnormal high pressure appears at the bottom of the Paleogene and obviously exists in the Triassic and Jurassic. However, the pressure coefficient in the Triassic and Jurassic is lower than that in the Cretaceous and at the bottom of the Paleogene. Horizontally, the abnormal high pressure distribution is characterized by E-W orientation zoning. The maximum pressure coefficient lies in the Kelasu-Dongqiu-Dina tectonic zones in the center of the Kuqa foreland thrust belt and decreases away from the tectonic zones. The formation of abnormal high pressure was mainly related with the intense tectonic compression in the Early Pleistocene time, and tectonic uplifting, undercompaction and hydrocarbon generation were secondary factors contributing to abnormal high pressure. Under the rapid and intense tectonic compression in the Early Pleistocene, the rock framework firstly undertook 1/4 of the compression stress and the other was borne by the pore fluids. Due to the presence of great seal of gypsum-salt or gypsum-mudstone beds in the Paleogene, the pressure of pore fluids increased rapidly and led to the abnormal high pressure in the Kuqa foreland thrust belt. The abnormal high pressure has important impacts on hydrocarbon accumulation. It is one of the necessary conditions for formation of large oil and gas fields in the Kuqa foreland thrust belt.

关键词： abnormal high pressure formation mechanism oil and gas reservoir Kuqa foreland thrust belt Tarim basin.

Genetic features of gas-condensate reservoirs in the Kekeya Field,southwest depression in the Tarim Basin,china

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Science china Earth Sciences 2009年第S1期52卷 19-25页

作者： ZHANG Min1,2,HUANG GuangHui1,2,ZHAO HongJing1,2 & WANG Xiang1,2 1 Department of Geochemistry,yangtze university,jingzhou 434023,china 2.key laboratory of oil & gas resources and exploration technology,ministry of education,yangtze university,jingzhou 434023,china 1. Department of Geochemistry Yangtze University Jingzhou 434023 China 2. key laboratory of oil & gas resources and exploration technology Ministry of Education Yangtze University Jingzhou 434023 China

oils,condensates and natural gases in the Kekeya Field,southeast depression of the Tarim Basin were studied for their geochemical characteristics. According to the distribution analysis of the C2/C3 values with C1/C2 values,C2/C3 values with C1/C3 values,as well as C2/C3 values with dryness index,there are two different types of natural gases in the studied field,which are spatially regularly distributed. One is the oil cracking gas,located on shallow reservoirs over X52 reservoir,namely Upper oil legs;the other is kerogen cracking gas,located on X72 reservoirs,X8 reservoirs and E2k reservoirs,namely Lower oil legs. In addition,the distribution patterns of molar concentration of oils and condensates with different carbon numbers of the n-alkanes in the Kekeya Field indicate that the crude oils have experienced several kinds of secondary alterations,which were closely related to the charging of gaseous hydrocarbons after petroleum accumulation. These results indicate that,based on the research of δ13C values of individual hydrocarbons,heptane values and isoheptane values of light hydrocarbons and aromatic maturity parameters for oils,condensates and natural gases,oils and gases were charged at different geological time in the Kekeya Field.

关键词： Kekeya Field thermal maturity secondary alteration oil and condensate genetic type of natural gas

Base level change and depositional filling response of Jurassic in the Qiangtang Basin of Tibet

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Science china Earth Sciences 2009年第S1期52卷 143-151页

作者： ZHANG ShangFeng1,2,ZHANG ChangMin1,HU MingYi1,GONG WenPing1,XIAO ChuanTao1,LIU AiHua1 & Lü Dong11 Remaining resources Research Group of Geoscience College,yangtze university,jingzhou 434023,china 2.key laboratory of exploration Technologies for oil and gas resources,ministry of education of china,yangtze university,jingzhou 434023,china 1. Remaining resources Research Group of Geoscience College Yangtze University Jingzhou 434023 China 2. key laboratory of exploration Technologies for oil and gas resources Ministry of Education of China Yangtze University Jingzhou 434023 China

The base level during the deposition of Jurassic in the Qiangtang Basin shows a complete cycle from rising to falling. The base level change is closely connected with tectonic evolution of the basin,especially connected with Bangonghu-Nujiang ocean evolution process in the formation and evolution of the basin. It is also affected by climate. The Jurassic strata correspond to a long-term base level cycle sequence. The sequence is in fact a non-complete symmetrical cycle,consisting of rising hemicycle and falling hemicycle. It can be divided into 6 intermediate-term base level cycle sequences,including 2 carbonate sequences,3 mixture sedimentary sequences of carbonate and clastic rocks and one clastic sedimentary sequence. Depositional filling characteristics during base level change show that Bangonghu-Nujiang ocean spreads in Toarcian-Bajocian ages,and is at the height of spreading of Bangonghu-Nujiang ocean in Bathonian-Oxfordian ages. In that process,sea area became smaller because of the dry climate. Eventually,marine depositional filling is ended with the subduction and collision of Bangonghu-Nujiang ocean.

关键词： Jurassic sequence base level cycle depositional filling response tectonic evolution Qiangtang Basin

Research advances in the Mesozoic tectonic regimes during the formation of Jiaodong ore cluster area

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Progress in Natural Science:Materials International 2006年第8期16卷 777-784页

作者： DENG Jun, YANG Liqiang, GE Liangsheng, WANG Qingfei, ZHANG Jing, GAO Bangfei, ZHOU Yinghua and JIANG Shaoqing (State key laboratory of Geological Processes and Mineral resources, china university of Geosciences, Beijing 100083, china key laboratory of Lithosphere Tectonics and Lithoprobing technology of ministry of education, china university of Geosciences, Beijing 100083, china) [a]State key laboratory of Geological Processes and Mineral resources China University of Geosciences Beijing China [b]key laboratory of Lithosphere Tectonics and Lithoprobing technology of ministry of education China University of Geosciences Beijing China

Based on research advances of the tectonic regime in Jiaodong ore cluster area and the related tectonic regime transformation in Mesozoic era in the eastern region of North china, in this paper, we first summarize some key problems required to be studied further on. Then we suggest an approach to dealing with these problems. It is known that the gold deposits in Jiaodong ore cluster area, which are of different mineralization styles, spatial distributions and geological settings, might be as a result from one or more geologic events in Mesozoic. Till now, this kind of research on the temporal evolution and spatial migration sequence, especially on the geodynamic mechanism of the above events, is far from sufficient. Moreover, quantitatively describing the action mode and the temporal-spatial framework of tectonic dynamic regimes and formulating the relative contribution of every tectonic dynamic regime for the metallogensis are still challenges to the geologists studying on the formation of Jiaodong ore cluster area. According to the interpretation of the regional tectonic analysis, the structural dynamics, the observation and the exploration of the mineralization network, we propose a geological-physical-chemical model with some constraints originated from the comprehensive analysis. We then use this model to simulate the coupled processes of the structural deformation, thermal transport, fluid flow and the chemical reaction. The obtained results indicate that the model is efficient in further analyzing the temporal-spatial evolutional trail of the tectonic regime in Jiaodong ore cluster area and in further understanding the nature of the mass metallogensis.

关键词： tectonic regime Mesozoic era Jiaodong ore cluster area genesis metallogenic system.

The equilibrium between diagenetic calcites and dolomites and its impact on reservoir quality in the sandstone reservoir of Kela 2 gas field

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Progress in Natural Science:Materials International 2007年第9期17卷 1051-1058页

作者： Gao Zhiqian1,Yu Bingsong2,3 and Lai Xingyun2,3(1.School of Energy resources,china university of Geosciences,Beijing 100083,china 2.State key laboratory of Geological Processes and Mineral resources,china university of Geosciences,Beijing 100083,china 3.ministry of education key laboratory of Lithosphere Structure,Deep Processes and exploration Technique,china university of Geosciences,Beijing 100083,china) School of Energy resources China University of Geosciences Beijing 100083 China State key laboratory of Geological Processes and Mineral resources China University of Geosciences Beijing 100083 China ministry of education key laboratory of Lithosphere Structure Deep Processes and Exploration Technique China University of Geosciences Beijing 100083 China

Based on the equilibrium theory of chemical reactions between water and rocks,this paper establishes a thermodynamic phase relationship diagram among calcites,dolomites and water solution under the condition of diagenesis based on the thermodynamic database of related minerals and fluids and dolomite's degree of order *** has been discovered that the equilibrium between calcites and dolomites in the diagenetic environment is strongly impacted by temperature and the Ca/Mg ratios in groundwater,and that the dolomite's degree of order in the diagenetic environment is a function of crystallization temperature and time,not controlled by water ***,the authors make a further analysis of the close relationship of chemical reaction between carbonate cements and pore water in the sandstone reservoirs of Kala 2 gas field in Kuche *** can be seen that there are different impacts on sandstone reservoir quality among the equilibrium system of calcites,dolomites and pore water at different depths of reservoirs.

关键词： diagenesis equilibrium between calcites and dolomites secondary pores Kela 2 gas field