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Petroleum Exploration and Development 2020年第6期47卷 1172-1182页

作者： JIN Mindong LI Bisong ZHU Xiang DAI Lincheng JIANG Zhili WU Hao LI Hui YANG Peiyun SINOPEC Exploration Company Chengdu 610041China

Based on the abundant outcrops and 3 D seismic data in Yuanba and its surrounding areas in northeastern Sichuan Basin,the characteristics,main controlling factors and development regularities of reservoirs in the fourth member of sinian Dengying Formation(shortened as Deng 4 Member)were analyzed comprehensively.The results show that the reservoirs were mainly developed in microbial dolomite associated with the microbial mound and dolarenite associated with grain beach,and had intergranular dissolution pores,inter-frame dissolution pores and karst caves as main storage space.The reservoirs were large in scale and strong in heterogeneity.The analysis of the reservoir genetic mechanisms shows that the reservoirs in the fourth member of Dengying Formation were the products of karstification on mound-beach facies deposited in the second episode of Tongwan movement.The karstification had the marks of eogenetic karstification such as granophyric karst system and half-dissociation zone.The reservoirs were controlled by the sedimentary facies belt,the mound beach facies was the decisive factor in reservoir development.Further analysis indicates that the Yuanba area had a geological background of well-developed platform margin mound beach facies,so mound beach bodies can be taken as a favorable exploration target.

关键词： reservoir mound beach facies karstification sinian Fourth member of Dengying Formation Yuanba area Sichuan Basin

Formation and destruction processes of upper sinian oil-gas pools in the Dingshan-Lintanchang structural belt, southeast Sichuan Basin, China

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Petroleum Science 2010年第3期7卷 289-301页

作者： Liu Shugen Zhang Zhijing Huang Wenming Wang Guozhi Sun Wei Xu Guosheng Yuan Haifeng Zhang Changjun Deng Bin State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Sichuan610059 China

The lower Cambrian Niutitang Formation hydrocarbon source rocks at the Dingshan- Lintanchang structure in the southeast Sichuan Basin were of medium-good quality with two excellent hydrocarbon-generating centers developed in the periphery areas, with a possibility of forming a medium to large-sized oil-gas field. Good reservoir rocks were the upper sinian （Dengying Formation） dolomites. The mudstone in the lower Cambrian Niutitang Formation with a good sealing capacity was the cap rock. The widely occurring bitumen in the Dengying Formation indicates that a paleo oil pool was once formed in the study area. The first stage of paleo oil pool formation was maturation of the lower Cambrian source rocks during the late Ordovician. Hydrocarbon generation from the lower Cambrian source rocks stopped due to the Devonian-Carboniferous uplifting. The lower Cambrian source rocks then restarted generation of large quantities of hydrocarbons after deposition of the middle Permian sediments. This was the second stage of the paleo oil pool formation. The oil in the paleo oil pool began to crack during the late Triassic and a paleo gas pool was formed. This paleo gas pool was destroyed during the Yanshan-Himalayan folding, uplifting and denudation. Bitumen can be widely seen in the Dengying Formation in wells and outcrops in the Sichuan Basin and its periphery areas. This provides strong evidence that the Dengying Formation in the Sichuan Basin and its periphery areas was once an ultra-large structural-lithologic oil-gas field, which was damaged during the Yanshan-Himalayan period.

关键词： sinian oil-gas pool Dingshan-Lintanchang structural belt Sichuan Basin

Distribution Features of the Nanhua-sinian Rifts and their Significance to Hydrocarbon Accumulation in the Tarim Basin

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 501-515页

作者： BAI Zhongkai CHENG Minghua CHEN Cheng HUO Junzhou ZHANG Junfeng ZHOU Xingui GAO Yongjin ZHAO Bo QIU Haijun HAN Miao YANG Youxing SUN Zhichao MIAO Miaoqing ZHANG Jinhu LI Qingyao Oil and Gas Survey CGSBeijing 100083China Korla Branch Research Institute of BGP KorlaXinjiang 841000China Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081China The 6th Gas Production Plant of Petrochina Changqing Oilfield Company Xi'an 710000China China Geological Survey Beijing 100029China

On the basis of reprocessing 34 new two-dimensional spliced long sections(20,191 km) in the Tarim Basin, the deep structure features of the Tarim Basin were analyzed through interpreting 30,451 km of two-dimensional seismic data and compiling basic maps. Seismic interpretation and geological analysis conclude that the Nanhua-sinian strata are a set of rift-depression depositional systems according to their tectonic and depositional features. The rift valley formed in the Nanhua Period, and the transformation became weaker during the late sinian Period, which eventually turned into depression. From bottom to top, the deposited strata include mafic igneous, tillite, mudstone, and dolomite. Three major depocenters developed inside this basin during the rift stage and are distributed in the eastern Tarim Basin, the Awati area, and the southwestern Tarim Basin. Among them, the rift in the eastern Tarim Basin strikes in the near east-west direction on the plane and coincides with the aeromagnetic anomaly belt. This represents a strong magnetic zone formed by upwelling basic volcanic rock along high, steep normal faults of the Nanhua Period. Controlled by the tectonic background, two types of sedimentary systems were developed in the rift stage and depression stage, showing two types of sequence features in the sinian depositional stage. The Nanhua System appears as a wedge-shaped formation, with its bottom in unconformable contact with the base. The rifting event has a strong influence on the current tectonic units in the Tarim Basin, and affects the distribution of source rock in the Yuertus Formation and reservoir beds in the Xiaoerbulake Formation in Lower Cambrian, as well as the gypseous cap rock in Middle Cambrian. The distribution features of the rifts have important and realistic significance for determining the direction of oil and gas exploration in the deep strata of the Tarim Basin. Comprehensive analysis suggests that the Tazhong region is the most favorable zone, and the Kalpin-Bachu region is the optimal

关键词： rift Nanhua Period sinian Period Tarim Basin

Discovery of seismites in Upper sinian stratiform lead-zinc deposits in Dadu River valley, Sichuan, China: Implication for ore genesis

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Science China Earth Sciences 2006年第11期49卷 1135-1146页

作者： LIN Fangcheng1,2 & PAN Guitang2 1. Geoscience College, Chengdu University of Technology, Chengdu 610059, China 2. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China Geoscience College Chengdu University of Technology Chengdu China Chengdu Institute of Geology and Mineral Resources Chengdu China

A number of lead-zinc sulphide deposits have been discovered in recent years in dolo- mitic rocks of the Upper sinian Dengying Formation in the Dadu River valley region, Sichuan Province, China. The lead-zinc mineralization is closely associated with a black siliceous exhalite that has been traced over 50 km of strike. This makes Dadu River valley the most extensive stratiform non-ferrous sulphide horizon having been discovered to date in China. In a previous study by the first author (LIN), these deposits were recognised as belonging to the broad spectrum of lead-zinc sedimentary exhala- tive (SEDEX) deposits. In this paper, seismites and seismogenetic structures occurring in close association with the Dadu River valley mineralized zone are described. The close spatial and temporal relationship between the seismites and mineralization provides strong evidence for the hypothesis that the lead-zinc SEDEX deposits formed in direct response to earthquake activities around the sinian-Cambrian boundary. The earthquakes are postulated to be an effective dynamic mechanism for triggering the upward migration of deep circulating ore fluids along synsedimentary growth faults and their exhalation onto the sea-floor to form the extensive deposits of stratiform lead-zinc sulphide ore.

关键词： seismites, earthquake, lead-zinc deposit, hydrothermal exhalation, Upper sinian Dengying Age.

Sedimentary and evolutionary characteristics of sinian in the Tarim Basin

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Petroleum Research 2017年第3期2卷 264-280页

作者： Kaibo Shi Bo Liu Weimin Jiang Xiaoqiao Gao Shiqi Liu Yingchu Shen School of Earth and Space Science Peking UniversityBeijing 100871China Institute of Oil and Gas Peking UniversityBeijing 100871China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

Analysis of sinian outcrops in the peripheral regions of the Tarim Basin,drilling and seismic data within the Tarim Basin,and combined with previous studies,distribution of sinian strata,tectonic setting,sedimentary system and lithofacies palaeogeography were well discussed.Results showed that three sedimentary systems were developed in the sinian System of the Tarim Basin,i.***.the clastic sedimentary system,the clastic-carbonate mixed sedimentary system,and the carbonate sedimentary system,vertical sedimentary characteristics evolved from the clastic sedimentary system to the carbonate sedimentary system.These three sedimentary systems were corresponded to three transgression-regression cycles in the sinian.The marine transgression during the initial period of the Early sinian(ZSQI)resulted in development of the clastic sedimentary system in the lower part of the Lower sinian;the transgression during the late period of the Early sinian(ZSQII)led to formation of the clastic-carbonate mixed sedimentary system in the upper part of the Lower sinian;the transgression during the initial period of the Late sinian(ZSQIII)resulted in development of carbonate sedimentary system in the Upper sinian.Three regressions resulted in formation of three unconformities,which were on the middle part of the Lower sinian,the top of the Lower sinian and the top of the Upper sinian respectively.Due to breakup of Rodinia supercontinent in the Neoproterozoic,the Tarim Basin was in the continental rifting evolutionary process.In the sinian,the basin experienced evolutionary processes of intra-cratonic depression and passive continental margin,thus characteristic of the lithofacies palaeogeography was characterized by uplifts in the south and depressions in the north.In the Early sinian,the Tarim Basin developed the Bachu-Tazhong-Tadongnan uplift and the Tabei residual ancient land,and the shore-shelf sedimentary environment in the north as well as the shore-shelf-bathyal sedimentary environment in the southwest.In the Late sinian,the Tabei

关键词： sinian Sequence Clastic sedimentary system Clastic-carbonate mixed sedimentary system Carbonate sedimentary system Lithofacies palaeogeography Tarim Basin

Geochemical Indication of sinian Bedded Siliceous Rocks in the Hunan-Guizhou-Guangxi Area and Their Environmental Significance

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Acta Geologica Sinica(English Edition) 2000年第1期74卷 46-53页

作者： PENG Jim YI Haisheng XIA Wenjie Postdoctoral Researchers Flow Station of SW China Petroleum Institute Institute of Sedimentary Geology Chengdu University of Technology Chengdu 610059 Institute of Sedimentary Geology Chengdu University of Technology Chengdu 610059

In the Hunan-Guizhou-Guangxi area there have developed very thick bedded siliceous rocks of the late sinian. The rocks have a fairly pure composition, with an average content of siliceous minerals exceeding 95%. They are relatively rich in Fe and Mn, and poor in Al, Ti and Mg. The Fe/Ti, (Fe+Mn)/Ti, Al/(Al+Fe+Mn) and U/Th ratios and the Al-Fe-Mn and Fe-Mn-(Ni+Co+Cu)×10 triangle diagrams all show that they are hydrothermal sedimentary siliceous rocks. In the rocks the total amount of REEs is low, the δCe shows an obvious negative anomaly and the δEu a weak anomaly, and LREE>HREE, all indicating that they are products of hydrothermal processes. The δ30Si and δ18O values, as well as the formation temperature of the rocks all clearly show that the silica forming the rocks comes from hot water. Besides, analyses of the depositional environment of the rocks using the MnO/TiO2 ratio and the δCe and δ30Si values yield the same conclusion that they are formed in environments from continental marginal slopes of a bathyal environment to oceanic basins of a deep-sea environment.

关键词： siliceous rock hydrothermal sedimentary geochemistry environment sinian the Hunan-Guizhou-Guangxi area

Hydrocarbon Accumulation Mechanism of sinian Reservoir in Anpingdian-Gaoshiti Structure, Middle Sichuan Basin

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Journal of China University of Geosciences 2008年第6期19卷 685-699页

作者：徐国盛毛敏袁海锋刘树根王国芝周存俭 State Key Laboratory of Oil and Gas Reservoir Geology and Exploration Chengdu University of Technology

The sinian reservior in Anpingdian （安平店）-Gaoshiti （高石梯） structure, Middle Sichuan （四川） basin, is of great importance to prospect for oil and gas. This article dissects the hydrocarbon accumulation mechanism of this area on the basis of comprehensive methods of organic geochemistry, fluid inclusion, modeling of hydrocarbon generation and expulsion from source rocks, and by combining structure evolutions and analyzing the key geologic features of hydrocarbon origin and trap. According to the fluid inclusion homogenization temperature analysis, there exist at least three stages of fluid charging in the sinian reservoir. From Middle-Late Jurassic to Early Cretaceous, oil cracked to gas gradually owing to high temperature at 200-220℃. The sinian gas pool was mainly formed at the stage when natural gas in trap was released from water and paleo-gas pools were being adjusted. It was a process in which natural gas dissipated, transferred, and redistributed, and which resulted in the present remnant gas pool in Anpindian-Gaositi tectonic belt. The authors resumed such an evolution process of sinian reservoir as from paleo-oil pools to paleo-gas pools, and till today＇s adjusted and reconstructed gas pools.

关键词： sinian accumulation mechanism fluid geochemistry Anpingdian-Gaoshiti structure Middle Sichuan basin

Geochemical Characteristics of sinian Manganese Deposits in China

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Acta Geologica Sinica(English Edition) 2000年第3期74卷 534-539页

作者： ZHU Kaijun YAO Guolong Tianjin Geological Academy State Bureau of Metallurgical IndustryTianjin 300061

sinian is one of the main periods of the formation of manganese deposits in China. sinian manganese deposits are mainly hosted in carbon-rich black shale and siliceous shale formed during the sinian interglacial period. The composition of manganese ore is simple. The main ore mineral is manganiferous carbonates. The grade of manganese ore is about 16–25%, with Mn/Fe>5 and P/Mn=0.006-0.14. Based on the tectonic setting and geological and geochemical characteristics of manganese deposits, this paper discusses the process of migration and concentration of manganese and ore-forming conditions of sinian manganese deposits in China.

关键词： manganese deposit sinian China

Sedimentary and Geochemical Characteristics of sinian Cap Carbonates in the Upper Yangtze Region

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Chinese Journal Of Geochemistry 2003年第4期22卷 320-329页

作者：杨瑞东王世杰董丽敏姜立君张卫华高慧 The State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Guizhou University of Technology

A global\|scale glaciation occurred at about 600 Ma ago. As a result, the Earth became the "Snowball Earth". The glaciation came to the end abruptly when atmospheric carbon dioxide increased to such an extent as to be about 350 times the modern level because of subaerial volcanic degassing. The rapid termination of glaciation would have led to warming of the Snowball Earth and extreme greenhouse conditions would have been created. The transfer of atmospheric carbon dioxide to oceans would give rise to the rapid precipitation of calcium carbonate in warm surface seawaters, thus forming the cap carbonate rocks as observed worldwide today.\; Regionally persisting, thin layers of carbonate rocks directly and ubiquitously overlie Proterozoic glacial deposits almost on every continent, and are commonly referred to as cap carbonates. Their unusual litho\| fabrics, stratigraphically abrupt basal and upper\|level contacts and strongly negative carbonate isotopic signatures (\{δ\{\}\+\{13\}C\-\{carb.\}\} values range from -7.0‰-0‰) suggest a chemical oceanographic origin, the details of which remain unknown. It is proposed that these enigmatic deposits are related to the destabilization of gaseous hydrate in terrestrial permafrost following rapid postglacial warming and flooding of widely exposed continental shelves and internal basins.\; The authors carried out studies on the geochemistry, sedimentology and palaeontology of the sinian cap carbonates in Guizhou and Hunan provinces, including the occurrence of cap carbonates of unusual fabrics, strongly negative carbon isotopic signatures, and a lot of bitumen nodules. From the results it is suggested that the cap carbonates were formed from solid methane seepage, and it is in agreement with Kennedy’s viewpoint (2001) that the cap carbonates resulted from the rapid precipitation of calcium carbonate in response to solid methane seepage.

关键词： litho-fabrics geochemistry cap carbonate sinian Upper Yangtze region

Stratigraphic implications of sinian-Early Cambrian volcanic ash beds on the Yangtze Platform

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Progress in Natural Science:Materials International 2004年第1期14卷 72-77页

作者： Christoph HEUBECK D 12249 Berlin Department of Geological Sciences Freie Universitaet Berlin Germany

Volcanic ash beds from shallow to deep water facies strata of the sinian Early Cambrian (Meishucunian) on the Yangtze Platform consist of bentonites and tuffites which are readily recognized in the field by their physical features and confirmed by geochemical analyses. Geochemistry suggests that the volcanic ash beds in Meishucunian time are rhyolite and rhyodacite while those in the Qiongzhusian and sinian are andesite and trachyandesite. The ash beds in the time equivalent strata, even in different areas display rather similar geochemical features, whereas the ash beds in different strata even in the same areas show large chemical difference. The results suggest that these ash beds can be used for intra and extra basinal correlations of the sinian Early Cambrian interval on the Yangtze Platform. Additionally, these ash beds suggest high potentials for further U Pb dating strategies.

关键词： bentonite tuffite volcanism geochemistry sinian Cambrian South China