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Fluid Inclusion Re-equilibration in Carbonate Rock Caused by Freezing during Microthermometric Analysis

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 580-582页

作者： YANG Peng liu keyu School of Geosciences China University of PetroleumQingdao 266580ShandongChina Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071ShandongChina

Fluid inclusions are minute sealed fluid droplets in minerals,often less than 10 μm in *** are commonly trapped in diagenetic cements or coalesced fractures in minerals,such as quartz,feldspar and calcite(Roedder,1984).Following the basic norm for fluid inclusion analysis,the“Roedder's Rules”(Roedder,1984),fluid inclusions have been widely used in reconstructing paleofluid evolution history within a reservoir in petroliferous basin(Bourdet et al.,2012).

关键词： minerals reservoir quartz

An Innovative Percolation Theory-based Method for Characterizing Shale Pore Connectivity

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1788-1790页

作者： YU Lingjie FAN Yuchen liu keyu School of Geosciences China University of PetroleumQingdaoShandong 266580China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development WuxiJiangsu 214151China SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms WuxiJiangsu 214151China Qingdao National Laboratory for Marine Science and Technology QingdaoShandong 266071China

Objective Pore connectivity is a critical factor affecting shale gas *** various techniques available for characterizing shale pore connectivity,digital core technology based on 3 D imaging using X-ray CT and focused ion beam scanning electron microscopy(FIBSEM)offers a promising approach to characterize complex and heterogeneous shale pore networks over multiscale.

关键词： shale connectivity Connectivity

Evaluation of 40^Ar/39^Ar Geochronology of Authigenic Illites in Determining Hydrocarbon Charge Timing： A Case Study from the Silurian Bituminous Sandstone Reservoirs, Tarim Basin, China

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 684-703页

作者： ZHANG Youyu liu keyu LUO Xiuquan Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China CNPC Key Laboratory for Basin Structure and Hydrocarbon Accumulation Beijing 100083 China State Key Laboratory of Enhaced Oil Recovery Beijing 100083 China Curtin University of Technology Bentley WA 6102 Australia

The Silurian bituminous sandstones（SBS） in the Tarim Basin, China are important basinwide reservoirs with an estimated area of approximately 249000 km^2. We investigated the ages of authigenic illites in the SBS reservoirs and constrained their formation timing by using the 40^Ar/39^Ar step wise heating method. The age spectra, 39^Ar recoil loss and their controlling factors were investigated systematically. The 40^Ar/39^Ar ages were compared with the conventional K/Ar ages of identical clay fractions. The clay in the SBS reservoirs is dominated by orderly mixed-layer illite/smectite（I/S） with 5%–30% smectite layers. The I/S minerals morphology comprises primarily honeycomb, short filamentous and curved-lath particles, characteristic of authigenic illites. The unencapsulated 40^Ar/39^Ar total gas ages（UTGA） of the authigenic illites range from 188.56 ± 6.20 Ma to 491.86 ± 27.68 Ma, which are 7% to 103% older than the corresponding K/Ar ages of 124.87 ± 1.11 Ma to 383.45 ± 2.80 Ma, respectively. The K-Ar ages indicate multistage accumulations with distinct distribution patterns in the Tarim Basin： older（late Caledonian-early Hercynian） around the basin margin, younger（late Hercynian） in the basin centre, and the youngest（middle to late Yanshanian） in the Ha-6 well-block, central area of the North Uplift. The age difference is believed to have been caused by the 39^Ar recoil loss during the irradiation process. Compared with the K/Ar ages, the estimated 39^Ar recoil losses in this study are in the range from 7% to 51%. The 39^Ar recoil loss appears to increase not only with the decreasing particle sizes of the I/S, but also with increasing percentage of smectite layers（IR） of the I/S, and smectite layer content（SLC） of the samples. We conclude that due to significant 39^Ar recoil losses, UTGA may not offer any meaningful geological ages of the authigenic illite formation in the SBS and thus can not be used to represent the hydrocarbon charge timing. 39^Ar recoil losse

关键词： authigenic illite 40^Ar/39^Ar dating 39^Ar recoil loss accumulation timing Silurian bituminous sandstone Tarim Basin

Impact of chlorites on the wettability of tight oil sandstone reservoirs in the Upper Triassic Yanchang Formation,Ordos Basin,China

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Science China Earth Sciences 2021年第6期64卷 951-961页

作者： Zhongnan WANG Xiaorong LUO keyu liu Yuchen FAN Xiangzeng WANG Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580China School of Geosciences China University of Petroleum(East China)Qingdao266580China Key Laboratory of Petroleum Resources Research Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao266071China Shanxi Yanchang Petroleum(Group)Co. Ltd.Xi’an710075China

Wettability is an essential property of reservoirs that is of great importance for enhancing oil recovery(EOR)and oil *** wettability of reservoirs is generally believed to be strongly affected by mineral compositions but it is not always the *** integrated study of petrography and wettability was carried out to determine the impact of chlorite minerals on the wettability of the sandstone reservoirs in the Upper Triassic Yanchang *** are found to be commonly present in the reservoir sandstones as detrital grains,rim-shaped cements,and biotite-chloritized forms with the pore peripheries being largely coated by chlorite,which is the main mineral in direct contact with *** pore scale,the wetting state of chlorites can either be oil-wet or water-wet in the tight sandstone reservoirs depending on wettability alteration by oil *** in contact with pores occupy a large of proportions of oil-wet pore walls and are crucial for the formation of oil-wetting state of reservoir *** core scale,the contents of chlorites in direct contact with pores do not correlate well with the AmottHarvey index due to other factors such as heterogeneity,oil-bearing degrees of samples.

关键词： Wettability Chlorite Pore scale Core scale Yanchang Formation Ordos Basin

Mixing processes and patterns of fluids in alkane-CO_(2)-water systems under high temperature and high pressure——Microscopic visual physical thermal simulations and molecular dynamics simulations

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Science China Earth Sciences 2023年第7期66卷 1622-1646页

作者： Guanghui YUAN Shuqi WU Yingchang CAO Zihao JIN keyu liu Yanzhong WANG National Key Laboratory of Deep Oil and Gas China University of PetroleumQingdao 266580China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

Various types of geofluids exist in deep and ultra-deep layers in petroliferous *** geofluids are much more active under high-temperature and high-pressure(HTHP)conditions,but their properties are *** simulated the mixing of different fluids in CH_(4)/C_(3)H_(8)/C_(6)H_(14)/C_(8)H_(18)-water systems and C_(6)H_(14)/C_(8)H_(18)-CO_(2)-H_(2)O systems at temperatures of 25℃ to 425℃ and pressures of 5 MPa to 105 MPa,using an in-situ micron quartz capillary tube thermal simulation system and molecular dynamics numerical simulation *** mixing processes,patterns,and mechanisms of various fluids were analyzed at microscale under increasing temperature and pressure *** results show that the miscibility of fluids in the different alkane-H_(2)O and alkane-CO_(2)-H_(2)O systems is not instantaneous,but the miscibility degree between different fluid phases increases as the temperature and pressure rise during the *** physical thermal experiments(PTEs)show that the mixing process can be divided into three stages:initial miscibility,segmented dynamic miscibility,and complete *** molecular dynamics numerical simulations(MDNSs)indicate that the mixing process of fluids in the alkane-H_(2)O and alkane CO_(2)-H_(2)O systems can be divided into seven and eight stages,*** carbon number affects the miscibility of alkanes and water,and the temperature and pressure required to reach the same miscibility stage with water increase with the carbon number(C_(3)H_(8),C_(6)H_(14),CH_(4),C_(8)H_(18)).CO_(2) has a critical bridge role in the miscibility of alkanes and water,and its presence significantly reduces the temperatures required to reach the initial,dynamic,and complete miscibility of alkanes and *** results are of great significance for analyzing and understanding the miscibility of geofluids in deep and ultra-deep HTHP systems.

关键词： High temperature high pressure(HTHP) Alkane-H_(2)O-CO_(2)system Mixing of geofluids In-situ visualization thermal experiments Molecular dynamics numerical simulation

Migration,filling history and geochemical characteristics of Ordovician natural gases in the Tahe Oilfield,Tarim Basin,Northwest China

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Chinese Journal Of Geochemistry 2009年第3期28卷 299-307页

作者： WANG Jie liu Wenhui QIN Jianzhong liu keyu GU Yi Wuxi Institute of Petroleum Geology SINOPEC Wuxi 214151 China CSIRO Petroleum PO.Box 1130 Bentley WA 6102 Australia

Ordovician natural gases in the Tahe Oilfield are composed predominantly of hydrocarbon gases dominated by methane with a significant amount of heavy hydrocarbon gas component. The non-hydrocarbon gases include N2, CO2 and minor H2S. The Ordovician natural gases are believed to have originated from the same source rocks, and are composite of gases differing in thermal maturity. Carbon dioxide was derived from thermal metamorphism of Ordovician carbonate rocks. The generation of natural gases involves multiple stages from mature normal oil and condensate-associated gas to thermally cracked gas at the maturity to over-maturity stages. In the main part of the Tahe Oilfield, the Ordovician natural gases appear to be filled in two major phases with a typical petroleum-associated gas from southeast to northwest and from east to west in the early stage; and a thermally cracked gas from east to west in the late stage. At the same time, the oil/gas filling boundary has been primarily established between the two stages.

关键词：天然气发电塔河油田奥陶系地球化学特征塔里木盆地西北烃类气体移民

A Combination of N2 and CO2 Adsorption to Characterize Nanopore Structure of Organic-Rich Lower Silurian Shale in the Upper Yangtze Platform, South China： Implications for Shale Gas Sorption Capacity

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Acta Geologica Sinica(English Edition) 2017年第4期91卷 1380-1394页

作者： CHEN Lei JIANG Zhenxue liu keyu GAO Fenglin WANG Pengfei State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 China Unconventional Natural Gas Institute China University of Petroleum Beijing 102249 China Unconventional Oil & Gas Cooperative Innovation Center China University of Petroleum Beijing 102249 China CSIRO Earth Science and Resource Engineering Bentley WA 6102 Australia School of Geosciences China University of Petroleum Qingdao 266580 Shandong China

The pores in shales are mainly of nanometer-scale, and their pore size distribution is very important for the preservation and exploitation of shale gas. This study focused on the organic-rich Lower Silurian black shale from four wells in the Upper Yangtze Platform, and their TOC, mineralogical composition and pore characterization were investigated. Low pressure N2 and CO2 adsorption were conducted at 77.35 K and 273.15 K, respectively, and the pore structures were characterized by modified Brunauer-Emmett-Teller （BET）, Dubinin-Radushkevich （DR）, t-plot, Barrett- Joyner-Halenda （BJH） and density functional theory （DFT） methods and then the relationship between pore structure and shale gas sorption capacity was discussed. The results indicate that （1） The Lower Silurian shale has high TOC content of 0.92%~96%, high quartz content of 30.6%-69.5%, and high clays content of 24.1%-51.2%. The total specific surface area varies from 7.56 m^2/g to 25.86 m^2/g. Both the total specific surface area and quartz content are positively associated with the TOC content. （2） Shale samples with higher TOC content have more micropores, which results in more complex nanopore structure. Micropore volumes/surface areas and non-micropore surface areas all increase with the increasing TOC content. （3） A combination of N2 and CO2 adsorption provides the most suitable detection range （~0.3-60 nm） and has high reliability and accuracy for nanopore structure characterization. （4） The TOC content is the key factor to control the gas sorption capacity of the Lower Silurian shale in the Upper Yangtze Platform.

关键词： shale gas nanopore structure Lower Silurian shale Upper Yangtze Platform sorption capacity

Characteristics,origins,and significance of pyrites in deep-water shales

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Science China Earth Sciences 2024年第2期67卷 313-342页

作者： Chao LIANG Shichao JI Yingchang CAO keyu liu Jing WU Fang HAO National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580China School of Geosciences China University of PetroleumQingdao266000China Laboratory for Marine Mineral Resource Qingdao National Laboratory for Marine Science and TechnologyQingdao266071China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao266590China

As important metal sulfides in the geochemical cycle of sulfur,the characteristics and formation processes of pyrites can provide useful clues regarding their *** on previous findings,shale pyrites were divided into three major classes(euhedral pyrites,framboidal pyrites(framboids)and metasomatic pyrites)and six sub-classes in this *** the microscopic scale,each type of pyrite is associated with a different formation *** are formed by burst nucleation in environments with a homogeneous distribution of nutrients while euhedral pyrites are usually formed on pre-existing sites(such as=FeS on the minerals surface)in the heterogeneous *** pyrites formed by the replacement of other ions in accountable material by iron ions and hydrogen sulfide ions in hydrothermal *** morphology and isotope value of pyrite provide information to track the origins of their nutrient and characteristics of sulfur and iron *** addition,the trace element content of pyrite can serve as a proxy for paleo-ocean trace element abundance,indicating changes in atmospheric oxygen ***,pyrite can also serves as an indicator of shale gas reservoirs.

关键词： Shale Pyrite Sulfate reduction reaction Isotope fractionation Pyrite element

Syn-rift to post-rift tectonic transition and drainage reorganization in continental rifting basins:Detrital zircon analysis from the Songliao Basin,NE China

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Geoscience Frontiers 2022年第3期13卷 210-224页

作者： Ying Song Jianye Ren keyu liu Dawei Lyu Xinjie Feng Yuan liu Andrei Stepashko Shandong Provincial Key Laboratory of Deep Oil&Gas China University of Petroleum(East China)Qingdao 266580China Department of Geology China University of Petroleum(East China)Qingdao 266580China Geology Department University of Illinois at Urbana-ChampaignUnited States Key Laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of Geosciences(Wuhan)Wuhan 430074China CSIRO Energy KensingtonWestern AustraliaAustralia Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals Shandong University of Science and TechnologyQingdao 266580China Kosygin Institute of Tectonics and Geophysics Far Eastern BranchRussian Academy of SciencesKhabarovskRussia

Tectonic transition from a syn-rift stage to subsequent post-rift stage is an important mechanism in the evolution of extensional *** sedimentary infill records the crustal response to this *** have obtained new detrital zircon U-Pb and Lu-Hf signatures from the Lower Cretaceous stratigraphic successions encompassing the commonly accepted syn-to post-rift transition boundary,the T4 unconformity,in the Songliao Basin,NE *** constrain the Songliao Basin’s evolution from its center to distal margins,providing insights into the sediment provenance and dispersal pattern over the tectonic *** of zircons from the syn-rift(the Shahezi and Yingcheng formations)and immediate post-rift(the Lower and Middle Denglouku Formation)stages reveals Phanerozoic age populations with positiveƐHf(t)values,which were derived from the proximal juvenile mantle-derived melt origin bedrocks of the Songliao *** contrast,the overlying samples from the Upper Denglouku Formation deposited in the subsequent post-rift stage contain exotic and ancient zircon populations with ages of 2.5 Ga&1.8 Ga and complex hafnium signatures,characteristic of a mixed *** are interpreted to be transported from distant cratonic terranes via larger drainage *** is obvious that the sediment dispersal pattern switched from being a local and hydrologically closed“intraregional”pattern to a“transcontinental”pattern during the *** time lag between the development of the T4 unconformity and the drainage reorganization also ensures a distinguishable3 Myr(106103 Ma,Late Albian)transition period of regional *** this transition stage,syn-rift faulting was replaced by postrift thermal subsidence,exhibiting a uniform sag *** new findings are important for understanding other continental rift basins during syn-to post-rift transition,which often demonstrates a complex interaction between the linkage and integration of sub-basins,and the

关键词： Rifting basin Songliao Basin Detrital geochronology Drainage reorganization Paleogeography