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A continuous and long-term in-situ stress measuring method based on fiber optic. Part I: Theory of inverse differential strain analysis

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Petroleum Science 2024年第2期21卷 1171-1189页

作者： Kun-Peng Zhang Mian Chen Chang-Jun Zhao Su Wang Yong-Dong Fan State Key Laboratory of Petroleum Resources and prospecting China University of PetroleumBeijing102249China MOE Key Laboratory of Petroleum Engineering in China University of Petroleum Beijing102249China Beijing International Center for Gas Hydrate School of Earth and Space SciencesPeking UniversityBeijing100871China

A method for in-situ stress measurement via fiber optics was proposed. The method utilizes the relationship between rock mass elastic parameters and in-situ stress. The approach offers the advantage of long-term stress measurements with high spatial resolution and frequency, significantly enhancing the ability to measure in-situ stress. The sensing casing, spirally wrapped with fiber optic, is cemented into the formation to establish a formation sensing nerve. Injecting fluid into the casing generates strain disturbance, establishing the relationship between rock mass properties and treatment ***, an optimization algorithm is established to invert the elastic parameters of formation via fiber optic strains. In the first part of this paper series, we established the theoretical basis for the inverse differential strain analysis method for in-situ stress measurement, which was subsequently verified using an analytical model. This paper is the fundamental basis for the inverse differential strain analysis method.

关键词： In-situ stress Fiber optic Orthotropic elastic Differential evolution ABAQUS

prospecting for coal in China with remote sensing

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Journal of China University of Mining and Technology 2008年第4期18卷 537-545,550页

作者： TAN Ke-long WAN Yu-qing SUN Sun-xin BAO Gui-bao KUANG Jing-shui Aerophotogrammetry and remote sensing Center of China Coal Xi＇ an Shaanxi 710054 China remote sensing Research Center Shanghai University Shanghai 200072 China

With the rapid development of China＇s economy, coal resources are increasingly in great demand. As a result, the remaining coal reserves diminish gradually with large-scale exploitation of coal resources. Easily-found mines which used to be identified from outcrops or were buried under shallow overburden are decreasing, especially in the prosperous eastern regions of China, which experience coal shortages. Currently the main targets of coal prospecting are concealed and unidentified underground coal bodies, making it more and more difficult for coal prospecting. It is therefore important to explore coal prospecting by taking advantage of modern remote sensing and geographic information system technologies. Given a theoretical basis for coal prospecting by remote sensing, we demonstrate the methodologies and existing problems systematically by summarizing past practices of coal prospecting with remote sensing. We propose a new theory of coal prospecting with remote sensing. In uncovered areas, coal resources can be prospected for by direct interpretation. In coal beating strata of developed areas covered by thin Quaternary strata or vegetation, prospecting for coal can be carried out by indirect interpretation of geomorphology and vegetation. For deeply buried underground deposits, coal prospecting can rely on tectonic structures, interpretation and analysis of new tectonic clues and regularity of coal formation and preservation controlled by tectonic structures. By applying newly hyper-spectral, multi-polarization, multi-angle, multi-temporal and multi-resolution remote sensing data and carrying out integrated analysis of geographic attributes, ground attributes, geophysical exploration results, geochemical exploration results, geological drilling results and remote sensing data by GIS tools, coal geology resources and mineralogical regularities can be explored and coal resource information can be acquired with some confidence.

关键词： remote sensing coal prospecting coal field prediction coal prospecting for deeply buried coal seams

An Improved Filter of Progressive TIN Densification for LiD AR Point Cloud Data

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Wuhan University Journal of Natural Sciences 2015年第4期20卷 362-368页

作者： WANG Huan WANG Shugen CHEN Qi JIN Weihua SUN Mingwei School of remote sensing and Information Engineering Wuhan University Faculty of Information Engineering China University of Geosciences (Wuhan) State Key Laboratory of Petroleum Resource and prospecting China University of Petroleum

Based on the classic filter of progressive triangulated irregular network（TIN） densification, an improved filter is proposed in this paper. In this method, we divide ground points into grids with certain size and select the lowest points in the grids to reconstruct TIN in the process of iteration. Compared with the classic filter of progressive TIN densification（PTD）, the improved method can filter out attached objects, avoid the interference of low objects and obtain relatively smooth bare-earth. In addition, this proposed filter can reduce memory requirements and be more efficient in processing huge data volume. The experimental results show that the filtering accuracy and efficiency of this method is higher than that of the PTD method.

关键词： light detection and ranging(Li DAR) filtering progressive TIN densification(PTD) triangulated irregular network(TIN)

Development history and prospect of remote sensing technology in coal geology of China

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International Journal of Coal Science & Technology 2020年第2期7卷 311-319页

作者： Kelong Tan Junwei Qiao General prospecting Institute of China National Administration of Coal Geology Beijing100039China College of Geology and Environment Xi’an University of Science and TechnologyXi’an710054ShaanxiChina Aerophoto Grammetry and remote sensing Bureau China National Administration of Coal GeologyXi’an710100ShaanxiChina

Coal remote sensing technology was founded in the period of coal resources survey after the founding of People’s Republic of *** Grammetry&remote sensing Bureau of China National Administration of Coal Geology was established,specializing in the application and promotion of coal remote sensing *** the rapid development of coal geological exploration in China,coal remote sensing technology has evolved from coal geology based survey to comprehensive survey that factors in resources,environment,ecology and so *** paper summarizes the general situation,theories,development process,key research and future of remote sensing technology for coal mining in *** over 50 years,the history of China’s coal remote sensing technology can be divided into five stages:aero-geological mapping,coal remote sensing theory experimental research,application research and promotion,architecture planning and productionisation,“3S”technology integration and *** paper expounds the main technical progress,application fields,major projects and major achievements in various historical periods,and points out that the coal remote sensing has entered a unified development stage of“Aviation,Aerospace and Ground”,with a focus on high-resolution remote sensing,hyperspectral remote sensing,radar remote sensing,“3S”technology integration and multi-means comprehensive exploration and *** the future,coal remote sensing technology will develop rapidly in data mass,technology integration,evaluation intelligence,integration application programming,system visualization,*** remote sensing technology has entered the industrial development from technology application.

关键词： remote sensing Coal remote sensing Coal geology Industrialization

Tests on Application of Soil Magnetic and Integrated Gamma Ray TLD and TC Methods to the Exploration of Sandstone-Type Uranium Deposits

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Acta Geologica Sinica(English Edition) 2000年第2期74卷 418-424页

作者： ZOU Ligui ZHANG Jiyun YAN Jun GUAN Shaobin Airborne Survey and remote sensing Center of Nuclear Industry P.O.Box 183Shijiazhuang 050002

This paper introduces the test results of the soil magnetic survey and the integrated gamma-ray TLD and TC methods for sandstone-type uranium exploration and describes the prospecting mechanism. The tests have proved that these approaches have yielded good results on classifying the sedimentary facies, defining the redox transitional zones and reflecting deep mineralization information. They may probably become new methods on searching for sandstone-type uranium deposits.

关键词： soil magnetism gamma-ray thermoluminescence dosimetry total count rate of gamma ray sandstone-type uranium deposit

Gravity and magnetic field characteristics and regional ore prospecting of the Yili ancient continent, West Tianshan, Xinjiang Uygur Autonomous Region, China

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China Geology 2020年第1期3卷 104-112页

作者： Xue-zhong Yu Yi-yuan He Meng Wang Jian Zhang Xuan-jie Zhang Zheng-guo Fan Aero Geophysical Survey and remote sensing centre for Natural Resources Beijing 100083China School of Earth Sciences East China University of TechnologyNanchang 330032China

Gold,iron,copper,lead-zinc and other mineral exploration in West Tianshan,Xinjiang Uygur Autonomous Region,has made remarkable progress in recent ***,due to the dispute on the tectonic division of West Tianshan,the ore-controlling factors and the regional metallogenic laws are *** authors analyze regional gravity data and notice that the high-value region corresponds to the Yili ancient continent,thus the southeastern boundary of the Yili ancient continent is *** analysis of gravity,aeromagnetic and geologic data reveals that the Tulasu basin,where some medium to large epithermal gold deposits locate,lies above the Yili ancient continent;the Yili Carboniferous-Permian rift extends in E-W direction,numbers of copper deposits have been found in the mid-west section of the rift which lies above the Yili ancient continent,whereas few copper deposits have been discovered in the east section which is outside the Yili ancient ***,the Yili ancient continent may be rich in gold,copper and other metal elements;the metal-bearing hydrothermal solution moves up with the activity of magmatism,and deposits in the favorable places(the Tulasu basin and the Yili Carboniferous-Permian rift),forming numerous small and medium gold,copper deposits,as well as some large and super-large gold ***,the tectonic-magmatic hydrothermal zone above the Yili ancient continent should be the prospective area for epithermal gold and copper polymetallic deposits.

关键词： Yili ancient continent Yili Carboniferous-Permian rift Gravity field Epithermal gold deposit Copper polymetallic deposit Geophysical and remote sensing survey engineering Xinjiang Uygur Autonomous Region China

Research achievements of the Qinghai-Tibet Plateau based on 60 years of aeromagnetic surveys

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China Geology 2021年第1期4卷 147-177页

作者： Sheng-qing Xiong China Aero Geophysical Survey and remote sensing Center for Natural Resources China Geological SurveyBeijing 100083China Key Laboratory of Airborne Geophysics and remote sensing Geology Ministry of Natural ResourcesBeijing 100083China

The Qinghai-Tibet Plateau(also referred to as the Plateau)has long received much attention from the community of geoscience due to its unique geographical location and rich mineral *** paper reviews the aeromagnetic surveys in the Plateau in the past 60 years and summarizes relevant research achievements,which mainly include the followings.(1)The boundaries between the Plateau and its surrounding regions have been *** detail,its western boundary is restricted by West Kunlun-Altyn Tagh arc-shaped magnetic anomaly zone forming due to the arc-shaped connection of the Altyn Tagh and Kangxiwa faults and its eastern boundary consists of the boundaries among different magnetic fields along the Longnan(Wudu)-Kangding ***,the fault on the northern margin of the Northern Qilian Mountains serves as its northern boundary.(2)The Plateau is mainly composed of four orogens that were stitched together,namely East Kunlun-Qilian,Hoh-Xil-Songpan,Chamdo-Southwestern Sanjiang(Nujiang,Lancang,and Jinsha rivers in southeastern China),and Gangdese-Himalaya orogens.(3)The basement of the Plateau is dominated by weakly magnetic Proterozoic metamorphic rocks and lacks strongly magnetic Archean crystalline basement of stable continents such as the Tarim and Sichuan ***,it exhibits the characteristics of unstable orogenic basement.(4)The Yarlung-Zangbo suture zone forming due to continent-continent collisions since the Cenozoic shows double aeromagnetic anomaly ***,it can be inferred that the Yarlung-Zangbo suture zone formed from the Indian Plate subducting towards and colliding with the Eurasian Plate twice.(5)A huge negative aeromagnetic anomaly in nearly SN trending has been discovered in the middle part of the Plateau,indicating a giant deep thermal-tectonic zone.(6)A dual-layer magnetic structure has been revealed in the *** consists of shallow magnetic anomaly zones in nearly EW and NW trending and deep magnetic anomaly zone

关键词： Aeromagnetic survey Tectonic framework Suture zone Fault Magnetic rocks Uplift Oil and gas resource assessment Ore prospecting Qinghai-Tibet Plateau

New Identification of Sericite Subclass Minerals Using Airborne Hyperspectral Data in the Xitan Region of Gansu Province and its Significance in Gold Ore prospecting

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 426-427页

作者： SUN Yu ZHAO Yingjun QIN Kai TIAN Feng LIU Pengfei Beijing Research Institute of Uranium geology Beijing 100029China National Key Laboratory of remote sensing Information and Image Analysis technology Beijing 100029China

Objective Hyperspectral remote sensing has attracted much attention in remote sensing research during recent years. It can elaborately identiry spectral characteristics of different objects by acquiring continuous spectral curves of ground objects, and can thus provide more information for geological research （Zhao Yingjun et al., 2015）. With the deepening hyperspectral remote sensing research, scholars have focused from the classification of alteration minerals to the identification of subclass minerals in order to explore their significance fbr ore prospecting. This work utilized hyperspectral remote sensing technology in the Xitan region of Gansu Province to identify limonite and two types of sericite subclass minerals, and conducted field verification and geochemical survey. In addition, we analyzed the geological environment of subclass sericite minerals （Van Ruitenbeek et al., 2006） to provide evidence for gold ore prospecting.

关键词： Sericite Subclass Minerals Using Airborne Hyperspectral

Origin of the hydrate bound gases in the Juhugeng Sag, Muli Basin, Tibetan Plateau

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International Journal of Coal Science & Technology 2020年第1期7卷 43-57页

作者： Shiming Liu Furong Tan Ting Huo Shuheng Tang Weixiao Zhao Haide Chao School of Energy Resource China University of GeosciencesBeijing 100083China Qinghai Institute of Coal Geological prospecting Xining 810001China Aerial Photogrammetry and remote sensing Center China National Administration of Coal GeologyXi'an 710199China The Second Exploration Institute of Geology in Qinghai Province Xining 810003China The Fourth Exploration Institute of Geology in Qinghai Province Xining 810008China

The Juhugeng Sag,located in northwest of the Muli Basin,Tibetan Plateau,has been investigated for coal and petroleum resources during the past several *** have been successful recoveries of gas hydrates during recent years from the Middle Jurassic Yaojie Formation that offer insight into the origin of the hydrocarbon gases from the complex sag *** study examines the organic geochemical and stable carbon isotopic characteristics of shale and coal samples from the Middle Jurassic Yaojie Formation of the Juhugeng Sag,as well as compares with carbon isotopes,gas amounts and components of hydrate-bound gas.A total of 19 samples from surface mining,including 12 samples of black shale and 7 samples of coal,were analysed using a micro-photometer,a gas chromatograph,Rock–Eval and isotope *** the shale samples contained 100%type I kerogen,and the random vitrinite reflectance values vary from 0.65%to 1.32%and achieve thermal pyrolysis *** values of methane(δ13C ranging from−52.6‰to−39.5‰andδD ranging from−285‰to−227‰)in the hydrate bound gases suggest that the methane originates mainly from thermogenic *** is proposed that ethane from the gas hydrate is thermogenic-produced,and this conjecture is supported by the fact that most of the gas hydrate also contains more than 30%of thermogenic C2+hydrocarbons and is similar to structure II *** isotope data from the gas hydrates show a positive carbon isotope series(δ13C1<δ13C2<δ13C3),with ethaneδ13C values being lighter than−28.5‰,as high consistency with source rocks from the Jurassic period indicate thermal oil-prone gas.A model of the accumulation of gas hydrate is ***,the gaseous sources of gas hydrates may be a subject for more research.

关键词： Muli Basin Stable carbon isotopes Gas hydrate Gas source Alkane gas