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Geochemical analysis of mixed oil in the Ordovician reservoir of the Halahatang Depression,Tarim Basin,China

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Chinese Journal Of Geochemistry 2013年第4期32卷 347-356页

作者： CHENG Bin wang tieguan CHANG Xiangchun State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Shandong University of Science and Technology

In this study,12 crude oil samples were collected and analyzed from the Ordovician reservoir in the Halahatang Depression,Tarim Basin,China.Although the density of oil samples varies considerably,based on saturated hydrocarbon gas chromatographic(GC),saturated and aromatic hydrocarbon gas chromatographic-mass spectrometric(GC/MS) and stable carbon isotopic composition analyses,all the samples are interpreted to represent a single oil population with similar characteristics in a source bed or a source kitchen,organic facies and even in oil charge history.The co-existence of a full suite of n-alkanes and acyclic isoprenoids with UCM and 25-norhopanes in the crude oil samples indicates mixing of biodegraded oil with fresher non-biodegraded oil in the Ordovician reservoir.Moreover,according to the conversion diagram of double filling ratios for subsurface mixed crude oils,biodegraded/non-biodegraded oil ratios were determined as in the range from 58/42 to 4/96.Based on oil density and oil mix ratio,the oils can be divided into two groups:Group 1,with specific density>0.88(g/cm3) and oil mix ratio>1,occurring in the north of the Upper Ordovician Lianglitage and Sangtamu Formation pinchout lines,and Group 2,with specific density<0.88(g/cm3) and oil mix ratio<1,occurring in the south of the pinchout lines.Obviously,Group 2 oils with low densities and being dominated by non-biodegraded oils are better than Group 1 oils with respect to quality.It is suggested that more attention should be paid to the area in the south of the Upper Ordovician Lianglitage and Sangtamu Formation pinchout lines for further exploration.

关键词：塔里木盆地地球化学分析奥陶系混合油储层中国生物降解油密度变化

The calculation of hydrocarbon-generating temperature——Theory and practice

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Chinese Journal Of Geochemistry 2008年第2期27卷 194-197页

作者： TANG Youjun wang tieguan College of Resource ＆ Information China University of Petroleum Beijing 102249 China Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of Education Department of Geochemistry Unversity of Yangtze Jingzhou 434023 China

How to quantitatively evaluate the maturity of crude oils is still an open question. Mango discovered a remarkable compositional invariance of four isoheptane ratios in crude oils, and proposed a steady-state catalytic model for the origin of light hydrocarbons. According to this model, 2,4/2,3 dimethylpentane ratio is a pure temperature parameter. Bement, Mango et al. established the functional equation between the two parameters-light hydrocarbon temperature and burial temperature and applied it to the calculation of hydrocarbon-generating temperature, which provided a new choice for the study of oil maturity. In this paper, the Mango's parameters for hydrocarbons from the Tazhong area were calculated, the average K1 value is 1.06, which is in good consistency with the Mango's proposal that the K1 value is relatively stable. Calculated with the functional formula of hydrocarbon-generating temperature, the hydrocarbon-generating temperatures are with the range of 120-129℃, and the converted vitrinite reflectance (Ro) varies from 0.88% to 0.90%. This is well consistent with the maturity characteristics of neohopanes. The results have verified the reliability of this method.

关键词：光烃稳定状态催化作用温度

Geochemical Characterization and Origin of High-Sulfur,Heavy Oils in Jiyang Sub-Basin,East China

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Acta Geologica Sinica(English Edition) 2011年第4期85卷 923-931页

作者： wang Guangli wang tieguan ZHANG Linye State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Institutes of Geological Science SINOPEC Shengli Oilfield CompanyDongying 257015China

High-sulfur,heavy petroleum is widely occurring in the Tertiary lacustrine Jiyang sub-basin, Bohai Bay Basin.They are differentiated into two families based on the bulk properties and biomarker compositions.Family 1 is characterized by high resins（40%-71%）and sulfur（2%-4%）,and low wax （l%-6%）,with n-alkanes removed by biodegradation,whereas family 2 is characterized by extremely abundant sulfur（3%-10%）,and high asphaltenes（7%-31%）and wax（2%-19%）,with no evidence of microbial attack.The oils of family 1 are distributed in the reservoir,lower than 1500 m throughout the sub-basin.Biomarker assemblages,such as low pristane/phytane ratios（1 Pr/Ph）and a high abundance of carotane,gammacerane,and dinosterane,suggest that they are derived from the calcareous mudstones and shales among the stratified,saline Es_4~u unit,in addition to the in situ biodegradation-concentrated sulfur content.However,the oils of family 2 are identified only in the western Zhanhua and eastern Chezhen depressions,with a depth deeper than 1700 m.Physical properties,together with biomarker ratios,including even-numbered n-alkanes,1 Pr/Ph,trace diasteranes,higher C35 homohopanes,and abundant dibenzothiophene series,with1 dibenzothiophene/phenanthrene,indicate an origin from carbonate source rocks.The X-ray diffraction analysis showed that the carbonate source rock is limited in the Es_4~u unit of the Bonan sag,which is different from most other source rocks in the same horizon.It is suggested that the high-sulfur,heavy oils are generated at the early stage of the oil window.Bacterial sulfate reduction might be responsible for the occurrence of sulfur species in the high-sulfur,heavy oils,while heavy biodegradation will enhance sulfur concentrations.

关键词： high-sulfur heavy oil bacterial sulfate reduction biodegradation lacustrine carbonate

Quantitative assessment and significance of gas washing of oil in Block 9 of the Tahe Oilfield,Tarim Basin,NW China

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Chinese Journal Of Geochemistry 2012年第2期31卷 165-173页

作者： CUI Jingwei wang tieguan wang Chunjiang LI Meijun PetroChina Research Institute of Petroleum Exploration ＆ Development PetroChina Beijing 100083 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China

Some Ordovician and Triassic oils in Block 9 are characterized by light oils,which have distinctly differentiated from heavy oils in other blocks in the Tahe Oilfield,Tarim Basin.Based on the whole oil gas chroma- tograms,this paper estimates the effect of oil migration and fractionation and the amount of depletion(Q)in terms of the n-alkanes depletion model.The results showed that the amount of depletion in the Ordovician reservoir is highest in the east of this block,e.***.the depletion is 97% in Well T904.The amount of Q gets lower to the west,e.***.the depletion is 53.4%in Well T115 and there is no sign of depletion in Well S69.It is suggested that the direction of gas washing is from the east to the west.The compositions and isotopic characteristics of associated gas in Ordovician oils indicated that the gas might be derived from Cambrian source rocks of the Caohu Depression which lies to the east of Block 9.In contrast,no obvious depletion of n-alkanes in Triassic oils was found,suggesting that the migration pathway of natural gas has been limited to the Ordovician karst fracture system formed in the Early Hercynian Orogeny.Different depletions of the Ordovician and Triassic oils can reveal fault activities in this region.

关键词：塔里木盆地塔河油田定量评估气体中国西北奥陶系油藏洗油正构烷烃

Applications of molecular fossils in lacustrine stratigraphy

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Chinese Journal Of Geochemistry 2010年第1期29卷 15-20页

作者： wang Guangli LI Shu wang tieguan ZHANG Linye State Key Laboratories of Petroleum Resources and Prospecting China University of Petroleum Changping Beijing 102249 China Exploration and Production Research Institute S1NOPEC Beijing 100083 China Research Institute ofGeoscience Shengli Oilfield Company SINOPEC Shandong Dongying 257015 China

Biomarkers,or the so-called molecular fossils,are used tentatively in the Eogene lacustrine stratigraphy study in the Jiyang Sub-basin.Notwithstanding the fact that unidentified microfossils or amorphism and acritarchae are widely distributed in lacustrine source rocks,molecular fossils are useful to identify the sources.It is helpful to reconstruct the palaeo-enviroment,palaeo-ecosystem and compartmentalize the stratigraphic sequence by using molecular fossils with which the existence and types of microbes including bacteria,archaea and certain algae can be identified.

关键词：分子化石湖相地层应用生物标志物湖相烃源岩下第三系生态系统地层划分

Identification and significance of 3β-alkyl steranes in the Eogene lacustrine sediments and petroleum of China

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Chinese Science Bulletin 2006年第13期51卷 1628-1632页

作者： wang Guangli ZHANG Linye wang tieguan Key Laboratory for Petroleum Formation Mechanisms Petroleum University of China Beijing 102249 China Institute of Geological Sciences Shengli Oilfield Co. Ltd Dongying 257015 China

Several homologous series of steranes with alkyl side chains (C1 to C4) at the 3β position have been identified in the Jiyang Eogene lacustrine deposition. It is postulated that its precursors repre sent a new class of steroids, alkylated at the C-3 po sition with a polyhydroxy n-alkane. These precursors may have been formed by the bacterial addition of a ribose sugar to ?2-sterenes, diagenetic alteration products of steroids synthesized by eukaryotes 3-alkyl steroids might substitute for hopanols in bac terial membranes. When they are present in a sam ple, the patterns of the isomer distributions of 3-alky steranes are similar to desmethyl steranes except fo lower rearranged ones. It is shown that the configu rational isomerization of 3-alkyl steranes is trending in line with that of desmethyl steranes with increasing of maturity. The abundance of 3-alkyl steranes may be controlled by the depositional environments; they are primary in saline or near shore lacustrine, mod erate in shallow lacustrine, poor in sub-deep to deep lacustrine relative to the 4-methyl steranes.

关键词： 3-烃基甾烷湖沉积 GC-MS-MS 早第三纪

DBT parameters and dynamic monitoring during reservoir development, and distribution region prediction of remaining oil:A case study on the Sha-3~3 oil reservoir in the Liubei region, Nanpu sag

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Science China Earth Sciences 2012年第12期55卷 2018-2025页

作者： XU YaoHui wang tieguan CHEN NengXue YANG CuiMin wang QiaoLi State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Department of Geochemistry Yangtze UniversityJingzhou 434023China Research Institute of Petroleum Exploration and Development Jidong OilfieldCNPCTangshan 063000China Chongqing Institute of Geology and Mineral Resources Chongqing 400042China

In this study, compositional characteristics of crude oil, including the variation of aliphatic, aromatic and pyrrolic nitrogen compounds, were systematically monitored and investigated in a high water-cut oil reservoir over a short time.The results showed that among the widely used parameters indicative of oil maturity and migration, tetramethyl/monomethyl DBT and tricyclic terpane/(tricyclic terpane+C30 hopanoid) varied remarkably, and a positive correlation was observed between these two parameters.The variation of each of these parameters during waterflooding development was correlated with the flow effect of crude promoted by the water drive in oil reservoirs.A solid consistency was observed among the results of numerical simulation and development; the direction and pathway of waterflooding crude was indicated by Tetramethyl/monomethyl DBT, and the distribution region prediction of remaining oil hereby obtained.Therefore, these two parameters could be used as molecular tracers for the oil during waterflooding.This study would be of practical significance for geochemical dynamic monitoring and reservoir development.

关键词：油藏原油开发过程动态监测 DBT 分布区剩余油南堡凹陷预测

Geochemistry and possible origin of the hydrocarbons from Wells Zhongshen1 and Zhongshen1C, Tazhong Uplift

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Science China Earth Sciences 2016年第1期59卷 840-850页

作者： SONG DaoFu wang tieguan LI MeiJun State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum

In 2013, a great breakthrough of deep petroleum exploration was achieved in the Cambrian pre-salt intervals of Wells Zhongshen1(ZS1) and Zhongshen1C(ZS1C), Tazhong Uplift. However, the hydrocarbon discovery in the Cambrian pre-salt intervals has triggered extensive controversy regarding the source of marine oils in the Tarim Basin. The geochemistry and origin of the Cambrian pre-salt hydrocarbons in Wells ZS1 and ZS1 C were investigated using GC, GC-MS and stable carbon isotope technique. These hydrocarbons can be easily distinguished into two genetic families based on their geochemical and carbon isotopic compositions. The oil and natural gases from the Awatage Formation of Well ZS1 are derived from Middle-Upper Ordovician source rocks. In contrast, the condensate and gases from the Xiaoerbulake Formation of Wells ZS1 and ZS1 C probably originate from Cambrian source rocks. The recent discovery of these hydrocarbons with two different sources in Wells ZS1 and ZS1 C suggests that both Middle-Upper Ordovician-sourced hydrocarbons and Cambrian-sourced petroleums are accumulated in the Tazhong Uplift, presenting a great exploration potential.

关键词：地球化学塔中隆起烃源岩碳氢化合物 GC-MS 中上奥陶统深层油气勘探碳同位素技术

A GC×GC-ToFMS Investigation of the Unresolved Complex Mixture and Associated Biomarkers in Biodegraded Petroleum

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Acta Geologica Sinica(English Edition) 2018年第5期92卷 1959-1972页

作者： wang Guangli Bernd Rolf Tatsuo SIMONEIT SHI Shengbao wang tieguan ZHONG Ningning wang Peirong State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology WA – Organic and Isotope Geochemistry Centre Department of Chemistry Curtin University Department of Chemistry College of Science Oregon State University

Heavy biodegraded crude oils have larger numbers of coeluting compounds than nonbiodegraded oils, and they are typically not resolved with conventional gas chromatography（GC）. This unresolved complex mixture（UCM） has been investigated using comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry（GC×GC-To FMS） within a set of biodegraded petroleums derived from distinct sedimentary basins, including northwestern Sichuan（Neoproterozoic, marine）, Tarim（Early Paleozoic, marine）, Bohai Bay（Eocene, saline/brackish） and Pearl River Mouth（Eocene, freshwater）. In general, the hydrocarbons that constitute the UCM in petroleum saturate fractions can be classified into three catalogues based on the distributions of resolved compounds on two dimensional chromatograms. Group 1 is composed mainly of normal and branched alkanes, isoprenoid alkanes and monocyclic alkanes; Group 2 comprises primarily terpanes ranging from two to five rings, and Group 3 is dominated by monoaromatic hydrocarbons such as tetralins and monoaromatic steranes. In addition, the UCM is source dependent and varies between oil populations. i.e., the UCM of petroleum derived from Precambrian and Early Paleozoic marine, Eocene saline/brackish and freshwater source rocks is specifically rich in higher homologues of A-norsteranes, series of 1,1,3-trimethyl-2-alkylcyclohexanes（carotenoid-derived alkanes）, and tetralin and indane compounds, respectively.

关键词： unresolved complex mixture（UCM） biomarker source biodegradation comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry（GC×GC-ToFMS）