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Evaluation of Shale Reservoir Quality by Geophysical Logging for Shuijingtuo Formation of lower cambrian in Yichang Area, Central Yangtze

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Journal of Earth Science 2021年第4期32卷 766-777页

作者： Xiaohong Chen Lin Chen Shu Jiang An Liu Shengyuan Luo Hai Li Peijun Li Ping Chen Wuhan Center China Geological SurveyWuhan 430205China Energy and Geoscience Institute University of UtahSalt Lake City 84108USA Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China College of Marine Science and Technology China University of GeosciencesWuhan 430074China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan 430074China

Taking the shale of Shuijingtuo Formation of lower cambrian in Yichang area as the research object,the shale reservoir characteristics are comprehensively evaluated and classified by fitting regression and formula calculation method in this study,using laboratory testing and geophysical logging *** results show that the interpretation data of ECS(elemental capture spectroscopy)logging has a high correlation with the measured minerals data,which can be a good method to evaluate the minerals component of the *** calculated content of brittle minerals at the lower part of Shuijingtuo Formation is the relatively highest,generally more than 40%,which is the most favorable segment for *** correlation coefficient between the interpretation data of CMR(combinable nuclear magnetic resonance)logging and the result of laboratory porosity test is 0.97,which can effectively and accurately evaluate the reservoir *** evaluation results show that the porosity of the lower member of Shuijingtuo Formation is generally greater than 3%,while that of the upper member is generally less than 3%.The lower segment is with the relative optimal physical *** is a good correlation between the acoustic logging data and the gas bearing content testing results.A gas bearing content evaluation model is *** results show that the gas bearing content of the lower 20 m shale is generally more than 2%,indicating that the lower part is a shale gas enrichment *** parameters such as Young modulus,Poisson ratio and brittleness index of shale reservoir are evaluated by using the logging data of P-wave time difference and S-wave time *** continuous 15 m shale at the lower part is with the relatively optimal low Poisson ratio,high Young modulus and high brittleness index,developing the optimum brittle *** on the evaluation and classification of above parameters,the shale is divided into three *** TypeⅠis the opt

关键词： reservoir evaluation shale Shuijingtuo Formation lower cambrian Yichang area

Skeletal faunas from the Qiongzhusian of southern Shaanxi: biodiversity and lithofacies-biofacies links in the lower cambrian carbonate settings

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Progress in Natural Science:Materials International 2004年第1期14卷 92-97页

作者： Michael STEINER 13355 Berlin Ackerstrasse 71～76 Germany Technische Universitt Berlin Sekr.ACK 14

The Xiaoyang section, located in Zhenba County of Shaanxi Province, is important both for documenting the biodiversity of the Qiongzhusian Stage (lower cambrian) and for analyzing lithofacies biofacies links in carbonate depositing environments on the Yangtze Platform. The skeletal fossils from the Xihaoping Member, including linguloid valves, cambroclavid and chancelloriid sclerites, genal and occipital spines of polymerid trilobites, and tubular fossils, are described here as the Eoobolus Cambroclavus fauna, which mainly occurred in peritidal environments. The fossils from the argillaceous limestones of the lower Shuijingtuo Formation, containing lingulate brachiopods, eodiscoid trilobites, bivalved arthropods, microdictyoniid sclerites and siliceous sponge spicules, are regarded as the Palaeobolus Hupeidiscus Kunmingella fauna, which presumably lived in subtidal or deeper water environments. The faunal diversity in the Xihaoping Member is lower than that in the lower Shuijingtuo Formation. The investigations of the skeletal fossil assemblages from carbonate lithofacies in southern Shaanxi will significantly contribute to a detailed documentation of the biodiversity during the Qiongzhusian interval on the Yangtze Platform and add new knowledge on the cambrian bioradiation.

关键词： skeletal fauna Xihaoping Member Shuijingtuo Formation lower cambrian Shaanxi

Controls on the organic carbon content of the lower cambrian black shale in the southeastern margin of Upper Yangtze

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Petroleum Science 2018年第4期15卷 709-721页

作者： Yu-Ying Zhang Zhi-Liang He Shu Jiang Shuang-Fang Lu Dian-Shi Xiao Guo-Hui Chen Jian-Hua Zhao School of Geosciences China University of Petroleum (East China) Petroleum Exploration and Production Research Institute SINOPEC Energy and Geoscience Institute University of Utah

Control of various factors, including mineral components, primary productivity and redox level, on the total organic carbon(TOC) in the lower cambrian black shale from southeastern margin of Upper Yangtze(Taozichong, Longbizui and Yanbei areas) is discussed in detail in this article. Mineral components in the study strata are dominated by quartz and clay minerals. Quartz in the Niutitang Formation is mainly of biogenic origin, and the content is in positive correlation with TOC, while the content of clay minerals is negatively correlated with TOC. Primary productivity, represented by the content of Mobio(biogenic molybdenum), Babio(biogenic barium) and phosphorus, is positively correlated with TOC. The main alkanes in studied samples are nCC, and odd–even priority values are closed to 1(0.73–1.13), which suggest the organic matter source was marine plankton. Element content ratios of U/Th and Ni/Co and compound ratio Pr/Ph indicate dysoxic–anoxic bottom water, with weak positive relative with TOC. In total, three main points can be drawn to explain the relationship between data and the factors affecting organic accumulation:(1) quartz-rich and clay-mineral-poor deep shelf–slope–basin environment was favorable for living organisms;(2) high productivity provided the material foundation for organic generation;(3) the redox conditions impact slightly on the content of organic matter under high productivity and dysoxic–anoxic condition.

关键词： Upper Yangtze lower cambrian Black shale Total organic carbon

New Vetulicoliids from the lower cambrian Guanshan Fauna, Kunming

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Acta Geologica Sinica(English Edition) 2005年第1期79卷 1-6页

作者： LUOHuilin FUXiaoping HUShixue LIYong CHENLiangzhong YOUTing LIUQi YunnanInstituteofGeologicalScience KunmingYunnan650011 ShenzhenPalaeontologicalMuseum ShenzhenGuangdong518004 FacultyofEarthScience ChinaUniversityofGeosciencesWuhanHubei430074

The Guanshan Fauna, a soft-bodied fauna intermediate between the Chengjiang Fauna and the Kaili Fauna and also the Burgess Shale Fauna stratigraphically, consists of trilobites, trilobitoides, Tuzoia, Vetulicola, Paleoscolex, brachiopods and sponges. The discovery and research of this fauna is of great significance in understading the 'cambrian Explosion' and the evolution of early life. The occurrence of vetulicoliids from the Guanshan Fauna not only adds new members to the taxonomic list, but also provides new information to the evolution of this animal group. This paper describe Vetulicola gantoucunensis Luo, Fu et Hu sp. nov. from the lower cambrian Wulongqing Formation in the Kunming area. Also presented are the amended description of Vetulicola and the comparisons with related genera within Vetulicoliids. The affinity, distribution, as well as evolution of vetulicoliids are discussed.

关键词： lower cambrian Wulongqing Formation Guanshan Fauna Vetulicoliids Kunming Yunnan

The nature, type, and origin of diagenetic uids and their control on the evolving porosity of the lower cambrian Xiaoerbulak Formation dolostone, northwestern Tarim Basin, China

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Petroleum Science 2020年第4期17卷 873-895页

作者： Pei-Xian Liu Shi-Biao Deng Ping Guan Yi-Qiu Jin Kai Wang Yong-Quan Chen Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing100871China Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China Research Institute of Petroleum Exploration and Development Tarim Oilfield BranchPetroChinaKorla841000XinjiangChina

The study on lower cambrian dolostones in Tarim Basin can improve our understanding of ancient and deeply buried carbonate *** this research,diagenetic fluid characteristics and their control on porosity evolution have been revealed by studying the petrography and in situ geochemistry of different *** types of diagenetic fluids were identified:(1) Replacive dolomites were deviated from shallow burial dolomitizing fluids,which might probably be concentrated ancient seawater at early stage.(2) Fine-to-medium crystalline,planar-e diamond pore-filling dolomites(Fd1) were likely slowly and sufficiently crystallized from deep-circulating crustal hydrothermal fluids during Devonian.(3) Coarse crystalline,non-planar-a saddle pore-filling dolomites(Fd2) might rapidly and insufficiently crystallize from magmatic hydrothermal fluids during *** dolomitizing fluids did not increase the porosity,but transformed the primary pores to dissolution pores through ***-circulating crustal hydrothermal fluids significantly increased porosity in the early stages by dissolving and then slightly decreased the porosity in the late stage due to Fd1 *** hydrothermal fluids only precipitated the Fd2 dolomites and slightly decreased the *** summary,Devonian deep-circulating crustal hydrothermal fluids dominated the porosity evolution of the lower cambrian dolostone reservoir in the Tarim Basin.

关键词： lower cambrian Dolostone reservoir In situ geochemistry Diagenetic fluids Porosity evolution

New Insight into Factors Controlling Organic Matter Distribution in lower cambrian Source Rocks: A Study from the Qiongzhusi Formation in South China

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Journal of Earth Science 2020年第1期31卷 181-194页

作者： Shucan Zheng Qinglai Feng Nicolas Tribovillard Thomas Servais Yan Zhang Bo Gao State Key Laboratory of Geological Processes and Mineral Resources China University of GeosciencesWuhan 430074China School of Earth Sciences China University of GeosciencesWuhan 430074China University of the Littoral Opal Coast UMR 8187 LOGF-59000 LilleFrance University ofLille CNRSUMR 8198 Evo-Eco-PaleoF-59000 LilleFrance Petroleum Exploration and Production Research Institute SINOPECBeijing 100083China

Sedimentary organic matter(OM) is a major reservoir of organic carbon in the global carbon cycle. Despite many studies, there still exist many debates on the mechanism of OM accumulation and preservation in marine sediments. We present a new field study of a lower cambrian shallow marine shelf sequence in the northern edge of the Yangtze Plate, China. Our results show that palynological OM and biogenic silica(Bio-Si) could be used alongside more conventional redox and paleo-productivity proxies to study the distribution of OM in marine sediments. The qualitative and quantitative study of palynological OM provides more detailed information on the nature of sedimentary organic carbon, which can be helpful in the assessment of primary productivity and OM preservation. In addition, the presence of Bio-Si stimulates the physical preservation of OM. Further analysis indicates that an increase in Bio-Si can promote OM preservation. This case-study provides insight into the intertwined factors controlling OM accumulation in the Early cambrian.

关键词： organic-rich sediment organic matter distribution type and origin of OM biogenic silica lower cambrian

From Basin Black Shales to Platform Carbonate Rocks:A Study on Sequence Stratigraphy for the lower cambrian of the Upper-Yangtze Region in South China

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Acta Geologica Sinica(English Edition) 2007年第5期81卷 739-755页

作者： MEI Mingxiang MA Yongsheng ZHANG Hai MENG Xiaoqing CHEN Yonghong State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 School of Earth Sciences and Resources China University of Geosciences Beijing 100083 Department of Oil-Fields China Petrochemical Corporation Beijing 100029

In the Upper-Yangtze region, especially in Guizhou Province and its adjacent areas, the lower cambrian is well developed and is marked by a succession from black shales of the basin facies to carbonate rocks of the platform facies. The drowning event of the platform occurring at the turn from Sinian to cambrian resulted in a set of black shales, i.e. the Niutitang Formation, which makes up the bottom part of the lower cambrian. With the shoaling of the sedimentary environment, a set of carbonate rocks, i.e. the Qingxudong Formation, was formed in the top part of the lower cambrian. Thus, the lower cambrian in the study area makes up one second-order sequence that can be further subdivided into five third-order sequences, and forms a regularly cyclic succession of transgression-regression. There is a regularly vertical stacking pattern for the third-order sequences in the second-order sequence. From bottom to top, the succession of the ＂CS （condensed section）＋HST （high-stand system tract）＂ of the third-order sequences is changed into the succession of the ＂TST （transgressive system tract）＋CS＋HST＂. Correspondingly, the drowning-type sequence boundary is changed into the exposure-type one. Therefore, both the second-order and the third-order sequences have similar sedimentary-facies architectures. A concomitant with these temporal changes, the lower cambrian with a thickness of 1000 m that contains five third-order sequences is changed into a condensed succession that cannot identify third-order sequences toward the southeast with the deepening of the sedimentary environment. According to the elementary features of the third-order sequences, i.e. the regularity o sedimentary-facies successions in space and the synchronism of sedimentary-environment changes in time, the detailed division of the third-order sequences at main logged sections in different paleogeographical background becomes the basis to establish the sequence-stratigraphic framework that can demonstrate

关键词： sequence-stratigraphy lower cambrian Upper-Yangtze region South China

Pore characteristics and formation mechanism of high-maturity organic-rich shale in lower cambrian Jiumenchong Formation,southern Guizhou

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Petroleum Research 2018年第1期3卷 57-65页

作者： Zhongbao Liu Bo Gao Zongquan Hu Wei Du Haikuan Nie Tao Jiang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Beijing 100083China Sinopec Petroleum Exploration and Production Research Institute Beijing 100083China School of Earth and Space Science Peking UniversityBeijing 100871China

In order to investigate pore characteristics and formation mechanism in the high-maturity organic-rich shale of lower cambrian Jiumenchong Formation in southern Guizhou,the pore structure,pore type and storage properties are well studied through the rock thin section,total rock X-ray diffraction,lowtemperature nitrogen adsorption,high pressure mercury injection-adsorption test,helium porosity test,argon ion polishing-scanning electron microscope,thermal evolution and pore evolution history reconstruction,and based on the diagenesis and compaction as well as thermal evolution process,a microscopic pore formation and evolution model of high-maturity organic-rich shale are *** result shows that the high-maturity organic-rich shale of Jiumenchong Formation has the average total specific surface area of 12.66m^(2)/g and the total pore volume of 11.54×10^(-3)cm^(3)/g,and the total specific surface area have a positive correlation with total pore volume;the total specific surface area and the total pore volume are slightly lower compared with the lower Silurian *** pores are dominated by micropores and mesopores,while macropores are very *** pores of the organic-rich shale mainly are organic pores with small diameter usually less than 30 nm,and the pore boundary form is irregular,the inorganic mineral pores are not *** with the Silurian shale,the shale has poorer reservoir property,the average porosity is only 2.80%;the horizontal permeability is 1e3 times of the vertical permeability,indicating the horizontal lamellations are not *** formation and evolution of pores in high-maturity organic-rich shale is jointly influenced by the evolutionary process of intergranular pores of inorganic mineral under the control of the diagenesis and compaction,the organic pore formation process in the hydrocarbon generation-oil formation-oil and gas transformation sequence under the control of thermal evolution,and the natural gas loss-suppl

关键词： Organic-rich shale Organic pore Inorganic pore Microfracture lower cambrian Southern Guizhou

Geochemistry of Platinum Group and Rare Earth Elements of the Polymetallic Layer in the lower cambrian,Weng'an,Guizhou Province

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 618-627页

作者： FU Yong WU Chaodong GUAN Ping QU Wenjun CHEN Jiafu Key Laboratory of Orogenic Belts and Crustal Evolution MOE Peking University Beijing 100871 China National Research Center of Geoanalysis Beijing 100037 China

The black shales of the lower cambrian Niutitang Formation in Weng＇an, on the Yangtze platform of south China, contain voluminous polymetallic sulfide deposits. A comprehensive geochemical investigation of trace, rare earth, and platinum group elements （PGE） has been undertaken in order to discuss its ore genesis and correlation with the tectono-depositional setting. The ore-bearing layers enrich molybdenum （Mo）, nickel （Ni）, vanadium （V）, lead （Pb）, strontium （Sr）, barium （Ba）, uranium （U）, arsenic （As）, and rare earth elements （REE） in abundance. High uranium/ thorium （U/Th） ratios （U/Th〉I） indicated that mineralization was mainly influenced by the hydrothermal process. The 8U value was above 1.9, showing a reducing sedimentary condition. The REE patterns showed high enrichment in light rare earth elements （LREE）（heavy rare earth elements （HREE）（LREE/HREE=5-17）, slightly negative europium （Eu） and cerium （Ce） anomalies （δEu=0.81- 0.93）, and positive Ce anomalies （δCe=0.76-1.12）. PGE abundance was characterized by the PGE-type distribution patterns, enriching platinum （Pt）, palladium （Pd）, ruthenium （Ru） and osmium （Os）. The Pt/Pd ratio was 0.8, which is close to the ratios of seawater and ultramafic rocks. All of these geochemical features suggest that the mineralization was triggered by hydrothermal activity in an extensional setting in the context of break-up of the Rodinian supercontinent.

关键词： geochemistry polymetallic layer hydrothermal activity lower cambrian