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Wu X.,Wuhan University | Xiao C.,China Aerospace Geophysical Survey & Remote Sensing Center for Land and Resources | Yang R.,China Aerospace Geophysical Survey & Remote Sensing Center for Land and Resources | Li Z.,Oil and Gas Resources Survey Center | Cui Z.,Central South University
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences

Every porphyry copper deposit has different geological structure, metallogenic epoch and ore controlling factors. Therefore, it is necessary to carry out geological investigation to obtain the information of the iconic alteration mineral assemblage to extract the alteration information by using remote sensing technology and determine prospective areas. A comprehensive analysis of geological characteristics and ore controlling factors of porphyry copper deposit in southern Peru is carried out in this study. The combined information of argillic- and phyllic-alteration and propylitic alteration is established as the ore prospecting indicator and the technology of alteration information extraction is explored with ASTER data. Combined with existing mining geological data, hyperspectral image and field survey results, alteration extraction results are confirmed as reliable and effective and the other two prospective areas are delineated. The multi-spectral remote sensing prospecting model is constructed and its application proves successful in other porphyry copper districts such as Chile, Argentina. © 2015, Editorial Department of Earth Science-Journal of China University of Geosciences. All right reserved. Source

Xiao C.,Yangtze University | Ye M.,Yangtze University | Wen Z.,Yangtze University | Zhao X.,Oil and Gas Resources Survey Center | And 2 more authors.
Earth Science Frontiers

It is the very first time to analyze and study the paleoflora of Emuerhe Group in the research area systematically and describe the major component characteristics of each plant category. The paleoflora is composed mainly of ancient ferns and seed plants, among which, ferns amount to 8 genus 15 species, containing Filicophyta and Sphenophyta; seed plants add up to 15 genus 29 species, contain Ginkgophyta, Cycadophyta and Coniferophyta. Plant fossil assemblage of Emuerhe Group bears the following characteristics:(1)Coniopteris has high diversity and abundance; (2) the classic Coniopteris burejensis and Eboracia lobifolia in Middle Jurassic have been found; (3) the simultaneous abundant appearance of Coniopteris,Cladophlebis,Eboracia is the prime feature of the paleoflora in the area. The above characteristics indicate that the Paleoflora belongs to the late Coniopteris-Phoenicopsis flora in Middle Jurassic. According to the comprehensive analysis on longitudinal distribution and combined features of the paleoflora in Emuerhe Group, the late flora combination Coniopteris-Phoenicopsis can be divided into 3 sub-combinations which are Coniopteris-Nilssonia in Xiufeng Formation, Coniopteris-Czekanowskia in Ershierzhan Formation and Coniopteris burejensis-Cladophlebis cf.asiatica in Mohe Formation-Kaikukang Formation. The study on paleoflora in Emuerhe Group not merely enriches the biostratigraphic data in the study area and identifies the geological age of Emuerhe Group which belongs to the Middle Jurassic,but more importantly solves the current basic geological problem of exploration of gas hydrate. ©, 2015, The Editorial Office of Earth Science Frontiers. All right reserved. Source

Li S.-Z.,China University of Petroleum - Beijing | Li S.-Z.,Oil and Gas Resources Survey Center | Kang Z.-H.,China University of Geosciences | Qiu H.-J.,Oil and Gas Resources Survey Center | And 2 more authors.
Geology in China

The southwest depression of Tarim Basin has good prospect of oil and gas resources, and it is currently the focus of the new exploration areas. The depression structure is complicated, which has zonality from east to west, sectional division from north to south, and characteristics of deformation in different stages. Hence it can be divided into four secondary tectonic units: thrust belt in the foreland of the Kunlun Mountains, Hetian-Kashi sag zone, Mageti slope, and Yutian uplift. Four sets of hydrocarbon source rocks of Cambrian-Ordovician, Carboniferous, Permian and Jurassic and their distribution characteristics were systematically analyzed, and the oil and gas source and characteristics in the area were summarized and analyzed on the basis of an analysis of reservoir and cap rock. Seven sets of favorable reservoir-cap combinations were tentatively put forward, the faults, and unconformities and permeable formations were considered to be good conducting systems. On the basis of comprehensive analysis of above accumulation conditions, in combination with the comprehensive consideration of such factors as oil and gas source, migration way and reservoir characteristics, the authors analyzed the accumulation mode, which is divided into two major types and five sorts of modes: one type is piedmont thrust belt near the source vertical migration accumulation mode, which includes exotic thrust body, wedge shaped body and primary body, whereas the other type is slope belt distant source lateral migration accumulation mode, which includes fault-propagation folds and ancient karst. On such a basis, favorable oil and gas exploration targets are further forecasted. Source

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