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geological characteristics and ‘‘sweet area'' evaluation for tight oil

Petroleum Science 2015年第4期12卷 606-617页

作者： Cai-Neng Zou Zhi Yang Lian-Hua Hou Ru-Kai Zhu Jing-Wei Cui Song-Tao Wu Sen-Hu Lin Qiu-Lin Guo She-Jiao Wang Deng-Hua Li Petro China Research Institute of Petroleum Exploration and Development

Tight oil has become the focus in exploration and development of unconventional oil in the world, especially in North America and China. In North America, there has been intensive exploration for tight oil in marine. In China, commercial exploration for tight oil in conti- nental sediments is now steadily underway. With the dis- covery of China＇s first tight oil field--Xin＇anbian Oilfield in the Ordos Basin, tight oil has been integrated officially into the category for reserves evaluation. geologically, tight oil is characterized by distribution in depressions and slopes of basins, extensive, mature, and high-quality source rocks, large-scale reservoir space with micro- and nanopore throat systems, source rocks and reservoirs in close contact and with continuous distribution, and local ＂sweet area.＂ The evaluation of the distribution of tight oil ＂sweet area＂ should focus on relationships between ＂six features.＂ These are source properties, lithology, physical properties, brittleness, hydrocarbon potential, and stress anisotropy. In North America, tight oil prospects are distributed in lamellar shale or marl, where natural fractures are fre- quently present, with TOC 〉 4 %, porosity 〉 7 %, brittle mineral content 〉 50 %, oil saturation of 50 %-80 %, API 〉 35~, and pressure coefficient 〉 1.30. In China, tight oil prospects are distributed in lamellar shale, tight sand- stone, or tight carbonate rocks, with TOC 〉 2 %, poros- ity 〉 8 %, brittle mineral content 〉 40 %, oil saturation of 60 %-90 %, low crude oil viscosity, or high formation pressure. Continental tight oil is pervasive in China and its preliminary estimated technically recoverable resources are about （20-25） × lO8^ t.

关键词： Tight oil geological features ＂Sweet area＂evaluation Tight reservoirs Unconventional oil and gas Shale oil

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A Research Review of Iron Oxide Copper-Gold Deposits

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Acta Geologica Sinica(English Edition) 2016年第4期90卷 1341-1352页

作者： LIU Shaofeng FU Shuixing Beijing Institute of Geology for Mineral Resources Beijing 100012 China

Iron oxide copper-gold （IOCG） deposits are a research focus of the current ore deposit geology, and have attracted much attention among the worldwide geologists and exploration experts due to their shallow depth, a wide variety of mineral species and large scale. This paper presents a review of the present IOCG deposits research, which includes the definition of IOCG deposits, temporal and spatial distribution, ore-forming environments, ore-forming magmatic rocks, their geological features, ore-controlling structures and ore-bearing rocks, mineralized alteration zoning, and their genesis and ore-forming process. This work also proposed the ore prospecting direction of IOCG deposits from a trinity model of metaUogenic geological bodies, metallogenic structure surface and metailogenic information signs, and discussed the existing problems of the IOCG deposits research.

关键词： IOCG deposits geological features ore-forming environments ore-forming process prospecting model

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geological Characteristics and Prospecting Criteria of Senji Molybdenum Ore Body in Urad Houqi, Inner Mongolia, China

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International Journal of Geosciences 2021年第4期12卷 439-446页

作者： Yonghui Su Yang Liu School of Earth Sciences and Resources China University of Geosciences (Beijing) Beijing China Inner Mongolia No. 1 geological Mineral Exploration and Development Co. Ltd. Hohhot Inner Mongolia China Erdaojiang Branch of Tonghua Land and Resources Bureau Tonghua China

geological Characteristics and Prospecting Indicators of Senji Molybdenum Ore Body in Urad Houqi, Inner Mongolia Based on geological mapping, soil geochemical survey, surface trough exploration and deep drilling verification and control, the Senji Molybdenum deposit was discovered. geological characteristics of the molybdenum ore body are described. The host lithology of molybdenum ore body is mainly in the cataclastic carbonated black plagioclase gneiss of the second rock member of the Paleoproterozoic Baoyintu Group, followed by Early Carboniferous monzogranite. The genetic type of the deposit is preliminarily deduced to be a hydrothermal filling vein-type molybdenum deposit. The significance of this paper is to summarize the prospecting marks of the molybdenum ore body in this area, so as to further guide the exploration work in this area, and at the same time provide a useful reference for the exploration work of similar deposits in other areas.

关键词： Orebody geological features Prospecting Criteria Ore Deposit Genesis Mo-lybdenum Ore Urad Houqi

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