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Liu X.,Geological Institute of China Chemical Geology and Mine Bureau | Zhu Y.,Petrochina | Su J.,Petrochina | Wang K.,Petrochina | Zhang B.,Shandong Zhengyuan Institute of Geological Exploration
Xinan Shiyou Daxue Xuebao/Journal of Southwest Petroleum University | Year: 2014

Hanilcatam area in Tarim Basin is abundant in hydrocarbon which is an important hydrocarbon exploration area and complex geology conditions. Based on the analysis of the geology, fluid, oil/gas distribution, and the controlling factors of Ha 8 Area in Hanilcatam buried hill, we conclude that the oil and water distribution of the zone is complex and the fluids with no zonation. During Caledonian and early Hercynian, Yingshan and Yijianfang Formation of Ordovician were reformed by polyphase carst, and hole-fracture reservoir developed well, which provides the well reservoir for hydrocarbon charge. Due to the rise and denudation of the Ordovician layers in buried hill karst area, Tumuxiuke as well as the above layers is closely related to the paleo oil reservoirs conservation. Fault kind and local structure controls the late hydrocarbon charging intensity and the reservoir types. The above factors result in relative singular migration-accumulation systems in wells Ha801, Ha8, Ha802, etc. This research is helpful exploration and exploitation of the carbonate buried hill reservoir's. Source


Wu Z.-J.,China University of Geosciences | Yi C.,Beijing Research Institute of Uranium Geology | Qi C.-J.,Geological Institute of China Chemical Geology and Mine Bureau | Hui X.-C.,Beijing Research Institute of Uranium Geology
Acta Geoscientica Sinica | Year: 2014

In order to investigate the relationship of the hydrochemical process to the uranium metallogenic mechanism of the Dongsheng uranium deposit in Ordos basin, the authors conducted contrastive mineralogical and REE geochemical analysis of non-mineralized samples in the oxidation zone and mineralized samples in the redox transitional zone by means of general slice, electron microprobe, clay mineral X-diffraction, SEM and chemical testing. Mineralogical studies show that argillic alteration and sericitization of plagioclase can be observed in all samples, and coffinite is the main uranium mineral and is always adsorbed by fragments or carbon dust. Another interesting phenomenon is that the mineralized samples in the redox transitional zone contain more carbon dust and carbonate than those in the oxidation zone. Geochemical studies indicate that non-mineralized samples in the oxidation zone and low mineralization samples in the redox transitional zone show flat REE patterns in PAAS-normalized rare earth element plots. However, samples with high uranium content in the redox transitional zone show two different REE patterns: samples with carbon dust show a MREE enrichment pattern and those with carbonate show a HREE enrichment pattern. Mineralogical and geochemical differences of samples from different zones indicate that aqueous chemical reaction is the main uranium mineralization rather than carbon absorption. In the aqueous chemical process, CO3 2- which prefers combining UO2 2+ and HRE3+ is the main inorganic complex anion in the mineralized hydrothermal water, and argillic alteration and sericitization of plagioclase with Ca2+ and SiO4 4- play an important role in the metallogenic process. Source


Wang J.-P.,Geological Institute of China Chemical Geology and Mine Bureau | Shang P.-Q.,Geological Institute of China Chemical Geology and Mine Bureau | Xiong X.-X.,China Taian Geological Institute of China Chemical Geology and Mine Bureau | Yang H.-Y.,Geological Institute of China Chemical Geology and Mine Bureau | Tang Y.,China Taian Geological Institute of China Chemical Geology and Mine Bureau
Geology in China | Year: 2014

The fluorite deposits have been divided into three types, i.e., sedimentary-reformation type, hydrothermal fluid filling type and accompanying type on the basis of studying ore-forming process of the ore deposits and synthesizing their genetic types and industrial types. Based on an analysis of the ore-forming conditions, ore control factors and mineralization of characteristic fluorite deposits, this paper summarizes metallogenic factors. And then the sedimentary-reformation deposits and hydrothermal fluid filling deposits have been divided into subtypes. The sedimentary-reformation deposits are classified into two deposit types, the hydrothermal fluid filling deposits into five deposit types and accompanying deposits into four deposit types according to principal commodity. Ore-forming geological background, ore-forming conditions, deposit features, ore-control factor and mineralization of each deposit type are analyzed, and the secondary and necessary factors of mineralization are summarized. Source


Wang J.-P.,Geological Institute of China Chemical Geology and Mine Bureau | Shang P.-Q.,Geological Institute of China Chemical Geology and Mine Bureau | Xiong X.-X.,General Institute of Chemical Geology Survey of China Chemical Geology and Mine Bureau | Yang H.-Y.,Geological Institute of China Chemical Geology and Mine Bureau | Tang Y.,General Institute of Chemical Geology Survey of China Chemical Geology and Mine Bureau
Geology in China | Year: 2015

Based on the classification of fluorite deposits, this paper divides the metallogenic units of fluorite deposits, and briefly describes ore-forming features of every unit according to the geotectonic background, distribution features, ore-forming conditions and ore-controlling factors. In addition, the metallogenic regularities of fluorite deposits in China are summarized. Fluorite deposits are mainly distributed in northern and southeastern China. The faulted fractures constitute the common and essential ore-forming factor. The deposition-reformation type fluorite deposits are genetically related to limestone and volcanic rocks. The most intrusive rocks related to the formation of fluorite deposits belong to Yanshanian period. Most deposition-reformation, hydrothermal-reformation, associated, large and gigantic fluorite deposits are genetically related to limestone. The deposits with three ore-forming elements of limestone, Yanshanian intrusive rocks and faulted fractures are generally large or gigantic fluorite deposits. Fluorite deposits in China were mainly formed in Yanshanian period. Source

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