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Red algal evidence for a marine regression during closure of the Paleo-Asian Ocean in the Junggar Basin and its linkage to hydrocarbon generation

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Science China Earth Sciences 2024年第9期67卷 2845-2863页

作者： Ruijie ZHANG Jian CAO Lizeng BIAN wenxuan hu Liuwen XIA Bin ZHANG Yong TANG Wenjun HE School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China PetroChina Xinjiang Oilfield Company Karamay 834000China

The closure of the Paleo-Asian Ocean was a significant geological event in northern Pangea during the *** had a significant effect on climate,biota,and environmental conditions of the Late Paleozoic Ice Age,and resulted in the development of vast energy *** paper reports on the first discovery of marine red algal fossils in the Junggar Basin and its linkage to hydrocarbon *** algae occur mainly in the Fengcheng Formation(ca.300 Ma)and provide direct fossil evidence for closure of the Paleo-Asian *** red algal fossils contain well-preserved reproductive organs,such as cystocarps and *** concentrations of C_(27) steranes(C_(27) regular steranes/sum of C_(27)-C_(29) regular steranes×100=14.30%-21.30%)and the marine biomarker 24-n-propylcholesterane(C_(30) diasterane[βα20S]/sum of C_(27)-C_(30) diasteranes[βα20S]×100=1.15%-1.85%)were detected in the red-algae-bearing hydrocarbon source *** experiments that simulate hydrocarbon generation show that the oil generation potential of the red-algae-bearing source rocks is 363.71 mg g^(-1) total organic *** result,combined with oil-source rock correlations,indicates these rocks contributed to the formation of oil and gas resources,particularly in the marginal areas of the *** lake basin inherited the water and biological conditions of the Paleo-Asian Ocean during a marine regression,which was an important factor in the development of these high-quality hydrocarbon source rocks in an alkaline saline *** results advance our understanding of the evolution of the Paleo-Asian Ocean,interactions between the ocean and a lake during the deposition of terrestrial hydrocarbon source rocks,and whether red algae can effectively generate hydrocarbons.

关键词： Biotic precursor 24-n-propylcholesterane Regressive lake basin Fengcheng Formation Junggar Basin

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苏北盆地溱潼凹陷沙垛1井侵入岩岩石学特征及其储集性与含油性研究

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石油实验地质 2024年第1期46卷 87-97页

作者：夏祥马晓东胡文瑄臧素华南京大学地球科学与工程学院南京210008 中国石化华东油气分公司南京210019

火成岩油气藏逐渐成为重要的油气藏类型,但火成岩储层非均质性很强,储集性能变化很大,储层成因机制研究非常薄弱,成为制约火成岩储层评价的主要瓶颈。以苏北盆地溱潼凹陷古近系阜宁组二段侵入岩为研究对象,通过系统的岩心观察、薄片鉴... 详细信息

火成岩油气藏逐渐成为重要的油气藏类型,但火成岩储层非均质性很强,储集性能变化很大,储层成因机制研究非常薄弱,成为制约火成岩储层评价的主要瓶颈。以苏北盆地溱潼凹陷古近系阜宁组二段侵入岩为研究对象,通过系统的岩心观察、薄片鉴定、电子探针分析测试和测井解释等,剖析了溱潼凹陷沙垛1井阜二段侵入岩岩性、岩相特征、储层特征和储层发育主控因素。结果表明:该区侵入岩的岩性纵向变化显著,由多期侵入岩叠加组成,顶部为辉绿岩,中部为辉石二长岩,下部为橄榄辉长岩;孔隙发育程度不均一,辉绿岩和辉石二长岩孔隙发育程度低,而橄榄辉长岩孔隙发育程度较高;由于多期侵入作用的叠加以及热液蚀变的改造,发育了较好的储集空间。孔隙类型主要为溶蚀孔和构造裂缝,还发育收缩裂缝。影响储层物性的主要因素是岩性和热液流体活动,其中橄榄辉长岩中辉石等暗色矿物最易蚀变,溶蚀孔发育程度高;此外,区域性的断裂构造在许多致密的火成岩中产生了大量的构造裂缝,有效沟通了侵入岩储层的孔缝系统,且为后期的溶蚀作用提供了岩浆热液流动的通道。沙垛1井钻遇的侵入岩总体上含油性差,下部侵入岩层中可见零星荧光显示,上部侵入岩层中基本不含油。

关键词：侵入岩储层特征含油性阜宁组二段溱潼凹陷苏北盆地

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哪种语言是患者期望的?在线健康平台上医生交互语言对患者的影响

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系统管理学报 2024年第5期33卷 1167-1180页

作者：胡文轩司广森张凡王浩西安交通大学管理学院西安710049 郑州大学商学院郑州450001 香港中文大学(深圳)经济与管理学院广东深圳518172

医生在健康平台上使用文字语言为患者提供疾病指导信息,而医生语言信息不太可能被患有不同疾病的患者全部接受。基于语言期望理论,识别在线医患交互背景下医生医疗专业性和人际性语言,并探究其对患者满意感知和回报行为的影响以及患者... 详细信息

医生在健康平台上使用文字语言为患者提供疾病指导信息,而医生语言信息不太可能被患有不同疾病的患者全部接受。基于语言期望理论,识别在线医患交互背景下医生医疗专业性和人际性语言,并探究其对患者满意感知和回报行为的影响以及患者疾病严重程度的调节作用。以国内一家领先的健康平台为研究对象,采集约52000条在线医患交互数据,采用文本挖掘、机器学习等方法处理数据。实证结果显示:医生医疗专业性语言正向影响患者满意感知和回报行为,而人际性语言负向影响患者满意感知和回报行为;患者疾病严重程度正向调节医生医疗专业性语言的影响,而负向调节医生人际性语言的影响。研究结果为医生如何在交互中有效使用文字语言满足具有不同疾病严重程度的患者期望提供指导。

关键词：在线健康平台医患交互医生语言患者期望机器学习

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Hydrothermal recrystallization of the Lower Ordovician dolomite and its significance to reservoir in northern Tarim Basin

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Science China Earth Sciences 2010年第3期53卷 368-381页

作者： Zhu DongYa JIN ZhiJun hu wenxuan Petroleum Production and Exploration Institute of China Petroleum and Chemical Corporation Beijing 100083China Department of Earth Sciences Nanjing UniversityNanjing 210093China

Discovered in S15 and some other wells, the Lower Ordovician in the northern Tarim Basin consists mainly of brown gray-dark gray very fine-fine crystalline dolomite, with a minor portion of locally light gray-white medium-coarse crystalline dolomite. Silicification can be observed in the medium-coarse dolomite, and some euhedral drusy quartz can also be found in pores and fractures of the dolomite. The homogenization temperature of the fluid inclusions in the medium-coarse dolomite is between 110 and 200°C with maximum between 140 and 190°C, and the salinity is between 10.7 and 18.5 wt.% NaCl Eq. The homogenization temperature and salinity of the fluid inclusions in the medium-coarse dolomite are similar to those in the drusy quartz. Compared with the very fine-fine dolomite, the medium-coarse phase contains relatively high Fe and Mn. The average concentration of FeO and MnO in the medium-coarse dolomite is 1.917% and 0.323%, respectively. The medium-coarse dolomite has a remarkable negative Eu anomaly, consistent with the REE pattern of the intermediate-felsic igneous rocks in the Tarim Basin. The oxygen isotopic composition of the medium-coarse dolomite is relatively lighter than that of the very fine-fine dolomite. The δ18OPDB values of the medium-coarse dolomite are between -10.35‰ and -7.31‰. The δ18OSMOW values of the fluid associated with the medium-coarse dolomite can be calculated according to homogenization temperature and oxygen isotope fractionation factor between dolomite and fluid, and the calculated values are between +4‰ and +10‰, consistent with those of the hydrothermal fluid. The medium-coarse dolomite has relatively high 87Sr/86Sr ratios as well, indi- cating an origin associated with intermediate-felsic igneous rock. The homogenization temperature, element composition, REE pattern, oxygen and strontium isotopes demonstrate that the medium-coarse dolomite is the result of recrystallization of very fine-fine dolomite under hydrothermal environment

关键词： Tarim hydrothermal dolomite recrystallization reservoir

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Effects of Deep Fluids on Hydrocarbon Generation and Accumulation in Chinese Petroliferous Basins

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Acta Geologica Sinica(English Edition) 2017年第1期91卷 301-319页

作者： Zhu Dongya LIU Quanyou JIN Zhijun MENG Qingqiang hu wenxuan State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083 China Petroleum Exploration and Production Research Institute of SINOPEC Beijing 100083 China Department of Earth Sciences Nanjing University Nanjing 210093 Jiangsu China

Deep fluids in a petroliferous basin generally come from the deep crust or mantle beneath the basin basement, and they transport deep substances（gases and aqueous solutions） as well as heat to sedimentary strata through deep faults. These deep fluids not only lead to large-scale accumulations of CO2, CH4, H2, He and other gases, but also significantly impact hydrocarbon generation and accumulation through organic-inorganic interactions. With the development of deep faults and magmatic-volcanic activities in different periods, most Chinese petroliferous basins have experienced strong impacts associated with deep fluid activity. In the Songliao, Bohai Bay, Northern Jiangsu, Sanshui, Yinggehai and Pearl Mouth Basins in China, a series of CO2 reservoirs have been discovered. The CO2 content is up to 99%, with δ-（13）C（CO2） values ranging from-4.1‰ to-0.37‰ and -3He/-4He ratios of up to 5.5 Ra. The abiogenic hydrocarbon gas reservoirs with commercial reserves, such as the Changde, Wanjinta, Zhaozhou, and Chaoyanggou reservoirs, are mainly distributed in the Xujiaweizi faulted depression of the Songliao Basin. The δ-（13）CCH4 values of the abiogenic alkane gases are generally -30‰ and exhibit an inverse carbon isotope sequence of δ-（13）C（CH4）δ-（13）C（C2H6）δ-（13）C（C3H8）δ-（13）C（C4H10）. According to laboratory experiments, introducing external H2 can improve the rate of hydrocarbon generation by up to 147% through the kerogen hydrogenation process. During the migration from deep to shallow depth, CO2 can significantly alter reservoir rocks. In clastic reservoirs, feldspar is easily altered by CO2-rich fluids, leading to the formation of dawsonite, a typical mineral in high CO2 partial pressure environments, as well as the creation of secondary porosity. In carbonate reservoirs, CO2-rich fluids predominately cause dissolution or precipitation of carbonate minerals. The minerals, e.g., calcite and dolomite, show some typical features, such as higher homogenization temperatures th

关键词： petroliferous basin deep fluids organic-inorganic interaction hydrogenation reservoir rock alteration hydrocarbon migration

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Molecular evolution of nitrogen-containing compounds in highly mature organic matter: Implications for the hydrocarbon generation potential

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Science China Earth Sciences 2023年第4期66卷 781-796页

作者： Jingkun ZHANG Jian CAO wenxuan hu Baoli XIANG Ni ZHOU Wanyun MA School of Earth Sciences and Engineering MOE Key Laboratory of Surficial GeochemistryNanjing UniversityNanjing 210023China Research Institute of Experiment and Testing PetroChina Xinjiang Oilfield CompanyKaramay 834000China

Evaluating the hydrocarbon generation potential of highly mature organic matter is a key and critically challenging area of research in petroleum geochemistry. To explore this issue, we used negative ion electrospray ionization-Fourier transform-ion cyclotron resonance-mass spectrometry to investigate the molecular evolution of N-containing compounds in Carboniferous-lower Permian source rocks with a range of maturities in the northwestern Junggar Basin, China. The N1compounds formed from on-fluorescent chlorophyll catabolites(NCCs), which record the characteristics of the residual soluble organic matter. These components remain in the source rocks after hydrocarbon generation and expulsion, and enable evaluation of the hydrocarbon generation potential. The newly defined indexes of molecular evolution, which are the polymerization index P1([DBE 18+DBE 15]/[DBE 12+DBE 9]_N1) and alkylation index R1(RC_(6–35)/RC_(0–5)), combined with the vitrinite reflectance(VR_(o)) and paleo-salinity index(β-carotane/n Cmax), can identify the factors that control the evolution of highly mature organic matter. The main factor for source rocks deposited in a weakly saline environment is the maturity, but for a highly saline environment both the maturity and salinity are key factors. The high salinity inhibits the molecular polymerization of organic matter and extends the oil generation peak. Given the differences in the bio-precursors in saline source rocks, we propose a new model for hydrocarbon generation that can be used to determine the oil generation potential of highly mature organic matter.

关键词： Negative ion ESI-FT-ICR-MS N-containing compound Residual hydrocarbon generation potential Highly mature organic matter Deep oil-gas Junggar Basin

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CO_2 Density-Raman Shift Relation Derived from Synthetic Inclusions in Fused Silica Capillaries and Its Application

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Acta Geologica Sinica(English Edition) 2009年第5期83卷 932-938页

作者： SONG Yucai CHOU I＇Ming hu wenxuan Burruss ROBERT LU Wanjun Institute of Geology China Academy of Geological Sciences Beijing 100037 China Department of Earth Sciences Nanjing University Nanjing 210093 China US Geological Survey National Center Reston VA 20192 USA State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074 China

The densities of CO2 inclusions in minerals are commonly used to determine the crystallizing conditions of the host minerals. However, conventional microthermometry is difficult to apply for inclusions of small size （〈 5-10 μm） or low density. Raman analysis is an alternative method for determining CO2 density, provided that the CO2 density-Raman shift relation is known. This study aims to establish this CO2 density-Raman shift relation by using CO2 inclusions synthesized in fused silica capillaries. By using this newly-developed synthetic technique, we formed pure CO2 inclusions, and their densities were determined by microthermometry. The Raman analysis showed that the relation between CO2 density （D in g/cm^3） and the separations （△ in cm^-1） between the two main bands （i.e. Fermi diad bands） in CO2 Raman spectra can be represented by a cubic equation： D （g/cm^3）=0.74203（-0.019^3＋5.90332△^2-610.79472△＋21050.30165）-3.54278 （r^2=0.99920）. Our calculated D value for a given A is between those obtained from two previously-reported equations, which were derived from different experimental methods. An example was given in this study to demonstrate that the densities of natural CO2 inclusions that could not be derived from microthermometry could be determined by using our method.

关键词： synthetic fluid inclusion fused silica capillary COz inclusion C02 density equation,Raman analysis

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Characterizing the maturity of highly evolved organic matter based on aromatic hydrocarbons and optimization with pyrobitumen reflectance and Raman spectral parameters

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Science China Earth Sciences 2022年第12期65卷 2335-2357页

作者： Zhaoxi ZUO Jian CAO wenxuan hu Chunhua SHI Xiaolin WANG Suping YAO Bing LUO State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjing 210023China Chongqing Gas Field of PetroChina Southwest Oil and Gas Field Company Chongqing 401120China

Maturity evaluation of highly evolved organic matter is an important problem in oil and gas geochemistry,because conventional organic geochemical proxies are not applicable due to hydrocarbon generation and *** this study,we investigated the pyrobitumen in the reservoirs of the Sinian Dengying Formation in the Sichuan Basin,*** focused on aromatic hydrocarbon biomarkers,and the calibration and application of aromatic maturity proxies using pyrobitumen reflectance and Raman spectral *** results show that only the thiophene compounds are effective maturity indicators,such as MDR(4-/1-MDBT),MDR′(4-MDBT/(1-MDBT+4-MDBT)),MDR1(1-MDBT/DBT),4,6-/(1,4+1,6)-DMDBT,(2,6+3,6)-/(1,4+1,6)-DMDBT,and[2,1]BNT/([2,1]BNT+[1,2]BNT),as these are largely independent of the optical anisotropy of *** condensation and incorporation of thiophene compounds can lead to an increase in the reflectance of pyrobitumen,which means the thiophene compound parameters are positively or negatively correlated with pyrobitumen *** potential maturity parameters were proposed,including DMDBTs/MDBTs,TeMDBTs/(DBT+MDBTs+DMDBTs+TMDBTs+TeMDBTs),1-MDBT/MDBTs,and[2,1]BNT/*** method and these parameters are universally applicable to maturity characterization,especially in rocks that lack vitrinite,contain strongly anisotropic organic matter,and have high contents of thiophene compounds.

关键词： Maturity characterization of high-evolution organic matter Reservoir pyrobitumen Optical texture Dengying Formation Sichuan Basin

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Noble gases in corundum megacrysts from the basalts in Changle,Shandong Province,eastern China

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Chinese Science Bulletin 2007年第3期52卷 380-387页

作者： hu wenxuan SONG YuCai CHEN XiaoMing TAO MingXin ZHANG LiuPing State Key Laboratory of Mineral Deposits Research Department of Earth Sciences Nanjing University Nanjing 210093 China Institute of Resources Sciences Beijing Normal University Beijing 100875 China Key Laboratory of Gas Geochemistry Lanzhou Institute of Geology Chinese Academy of Sciences Lanzhou 730000 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

This study presents noble gaseous data of the corundum megacrysts from the Cenozoic basalts in Changle, Shandong Province, eastern China. It is known that no noble gaseous data of corundum megacryst have been documented before. The 3He/4He ratios (1.13-7.37 Ra) of the corundums from Changle vary from atmosphere to MORB values; the 20Ne/22Ne (9.67-10.75) and 21Ne/22Ne (0.0280-0.0372) data define two linear trends on Ne three-isotope diagram, respectively, along the MFL and the correlation line between atmosphere and MORB; the 38Ar/36Ar (0.177-0.194) ratios, the 40Ar/36Ar (280.9 -404.2) ratios and the 128-136Xe/132Xe ration with obvious 129Xe excess are generally higher than at-mospheric component, but the 40Ar/36Ar ratios are much closer to atomospheric ratio. The isotopic compositions of noble gases (particularly for He and Ar) of the corundums are similar to those of py-roxene, anorthoclase megacrysts, and mantle-derived xenoliths from this area, and those of man-tle-derived xenoliths from several areas in eastern China. Therefore, the noble gases trapped in the corundums probably are from mantle source, representing a ‘mixed fluid' produced by the interaction between the lithospheric mantle and fluids releasing from the convective plate. Both the noble gas isotopic compositions and the oxygen isotopic compositions of the solid corundums are not the characteristics of crustal source. These suggest that the corundums crystallized from mantle-derived magmas with minimal crustal contamination.

关键词：山东长乐玄武岩刚玉伟晶地幔惰性气体

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Co-evolution of paleo-environment and bio-precursors in a Permian alkaline lake,Mahu mega-oil province,Junggar Basin:Implications for oil sources

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Science China Earth Sciences 2022年第3期65卷 462-476页

作者： Liuwen XIA Jian CAO Lizeng BIAN wenxuan hu Tingting WANG Dongming ZHI Yong TANG Erting LI Department of Earth Sciences Nanjing UniversityNanjing 210023China PetroChina Xinjiang Oilfield Company Karamay 834000China

The co-evolution of paleo-environment and bio-precursors in alkaline lakes is of significance to understand the extreme environment system and associated enigmatic hydrocarbon *** we used organic petrology and biomarker geochemistry to investigate the bio-precursors in a Permian alkaline paleo-lake in the Mahu mega-oil province within about a hundred miles of the Mahu Sag,Junggar Basin,China,and its effect on oil generation and *** general,the bioprecursors in the alkaline lacustrine source rocks of the Fengcheng Formation were mainly bacteria and algae,with a low abundance of higher ***,these source rocks were mainly prone to oil *** distinctive hydrocarbongenerating bio-precursors—Dunaliella-like algae and cyanobacteria—were *** addition to fossil evidence for these bio-precursors,the former results in a high C_(28)/C_(29)sterane ratio andβ-carotane abundance,and the latter results in the formation of medium-chain monomethyl alkanes in terms of *** nature of the bio-precursors varied with the sedimentary paleo-environment,and was controlled by the salinity and stratification of the ***-type source rocks were deposited in the central area of the alkaline lake,and cyanobacteria-type source rocks were formed around the lake *** crude oils in different parts of the Mahu mega-oil province within about a hundred miles have different *** bio-precursors in the saline lacustrine source rocks were jointly controlled by the age and water salinity of the source *** physiological synthesis of carotenoids and sterols by haloalkaliphilic green algae may have affected the evolution of ancient green algae.

关键词： Green algae Dunaliella Cyanobacteria Bio-precursors Saline lacustrine basin Terrestrial petroleum Mahu Sag

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