A noise suppression method for superconducting full tensor aeromagnetic gradient measurement data     

ZiQi Guo  ShuangXi Ji  Yanchao Qiao  Ji Wang 《《地质学报》英文版》2018,92(Z1):367-368

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Characteristics, differences and main controlling factors of source rocks in the central-southern South China Sea Basins     

WANG Yibo  XIE Xiaojun  LAN Lei  GUO Ji  WANG Long  TANG Wu 《《地质学报》英文版》2018,92(Z2):113-114

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Reservoir Characteristics and Genetic Mechanisms of the Mesozoic Granite Buried Hills in the Deep‐water of the Qiongdongnan Basin,Northern South China Sea     

YOU Li  XU Shouli  MAO Xuelian  ZHONG Ji  JIAO Yaoqi  XIONG Xiaofeng 《《地质学报》英文版》2021,95(1):259-267

Due to its structure,rock and mineral composition,fluid and other factors,the granite Buried Hill Reservoir is highly heterogeneous with a complex longitudinal structure and a reservoir space made up of a combination of dissolution pores and fractures.This paper is based on current understanding of tectonic evolution in the northern part of the South China Sea,in conjunction with the seismic phase characteristics.It is determined that the meshed fault system was formed by three stages of movement-tectonic compression orogeny during the Indochinese epoch,strike-slip compression-tension during the Yanshanian Period,early fracture extension activation during the Himalayan-which controlled the distribution of the Buried Hill Reservoir.Drilling revealed two types of buried hills,faulted anticline and fault horst,their longitudinal structure and the reservoir space type being significantly different.The mineral composition,reservoir space and diagenetic characteristics of the reservoir rocks and minerals were analyzed by lithogeochemistry,micro section and logging etc.,it thus being determined that the Mesozoic rocks of the Songnan Low Uplift in the Qiongdongnan Basin are mainly composed of syenogranite,granodiorite,monzogranite,which is the material basis for the development of the Buried Hill Reservoir.The content of felsic and other brittle minerals is more than 70%,making it easy for it to be transformed into fractures.At the same time,the weathering resistance of granodiorite and monzogranite is weaker than that of syenogranite,which is easily weathered and destroyed,forming a thick sand gravel weathering zone.With increasing depth of burial,weathering and dissolution gradually weaken,the deep acidic fluid improving the reservoir property of internal fractures and expanding the vertical distribution range of the reservoirs.The research results lay a foundation for the exploration of Buried Hill in the deep-water area of the Qiongdongnan Basin.  相似文献   

Characteristics and Genesis of the Labuzaika Gold Deposit, Western Qinling Orogen, China     

CHANG Ji  LI Jianwei 《《地质学报》英文版》2014,88(Z2):690-690

Please refer to the attachment(s) for more details  相似文献   

Damage by Swelling Clay and Experimental Study of Cyclic Foam Stimulation     

ZHANG Jiaming  WU Xiaodong  HAN Guoqing  ZHANG Kai  WANG Jingyao  ZHANG Ji  WANG Bo  CHEN Zhangxing 《《地质学报》英文版》2015,89(Z1):215-216

<正>The performances of the formation damage are permeability decreasing,skin factor increasing and productivity index decreasing.Generally,formation damage is not reversible.This phenomenon is known as reverse funnel effect(Porter 1989).People have been trying to find effective ways to remedy the reservoir damage.Stimulation and hydraulic fracture are traditional  相似文献   

Variations of calcareous nannofossils of cobalt-rich crusts and geological records at the Eocene-OIigocene transition in western Pacific seamounts     

ZHANG HaiSheng  HU Ji  ZHAO Jun  HAN ZhengBing  YU PeiSong  WU GuangHai  LEI Ji Jiang  LU Bing  Irina A PULYAEVA 《中国科学:地球科学(英文版)》2015,(5):784-794

Two records of the crust laminae from the Marcus-Wake Seamounts and the Magellan Seamount were biostratigraphically studied. Based on biological imprints of the calcareous nannofossils, the geological ages of the two records were determined, with CM1D03 from the Marcus-Wake Seamounts being of late Paleocene to Pleistocene and CM3D06 from the Magellan Seamount of Late Cretaceous(more than 70.0 Ma). There are the obvious temporal-spatial differences in the initial formation period and enrichment characteristics of the cobalt-rich crusts of the two seamount chains and differences in the combination and distribution of microfossils in the inner crust layers between the seamounts. These differences are due to the adaptabilities of oceanic species in different environments. Ecological research was carried out in terms of population size of the calcareous nannofossils preserved in the crustal layers to discern the relation of the geological events at the Eocene-Oligocene(E/O) transition. The results show the transitions and recombination of species in the biotic community during the E/O transition obviously corresponded to 25 mm depth in the CM1D03 crust and 58 mm depth in the CM3D06 crust. The changes in biological species and the formation of particular ecological structures indicate the adaptive response of the paleo-biological community in the western Pacific Ocean to the global cold-climate events and the close correlation between the formation of the crust and the global climate change.  相似文献   

Advances in alternating electromagnetic field data processing for earthquake monitoring in China   总被引：1，自引：0，他引：1  

ZHAO Guo Ze  BI Ya Xin  WANG Li Feng  HAN Bing  WANG Xiao  XIAO Qi Bin  CAI Jun Tao  ZHAN Yan  CHEN Xiao Bin  TANG Ji  WANG Ji Jun 《中国科学:地球科学(英文版)》2015,(2):172-182

The alternating electromagnetic(EM) field is one of the most sensitive physical fields related to earthquakes. There have been a number of publications reporting EM anomalies associated with earthquakes. With increasing applications and research of artificial-source extremely low frequency EM and satellite EM technologies in earthquake studies, the amount of observed data from the alternating EM method increases rapidly and exponentially, so it is imperative to develop suitable and effective methods for processing and analyzing the influx of big data. This paper presents research on the self-adaptive filter and wavelet techniques and their applications to analyzing EM data obtained from ground measurements and satellite observations, respectively. Analysis results show that the self-adaptive filter method can identify both natural- and artificial-source EM signals, and enhance the ratio between signal and noise of EM field spectra, apparent resistivity, and others. The wavelet analysis is capable of detecting possible correlation between EM anomalies and seismic events. These techniques are effective in processing and analyzing massive data obtained from EM observations.  相似文献   

ORPOM model for optimum distribution of tree ring sampling based on the climate observation network     

Long M  TingXi Liu  YanYun Luo  HongLan Ji  ShiQiang Li  JunXiao Shi 《寒旱区科学》2010,2(6):0547-0554

Tree ring dating plays an important role in obtaining past climate information.The fundamental study of obtaining tree ring samples in typical climate regions is particularly essential.The optimum distribution of tree ring sampling sites based on climate information from the Climate Observation Network(ORPOM model) is presented in this article.In this setup,the tree rings in a typical region are used for surface representation,by applying excellent correlation with the climate information as the main principle.Taking the Horqin Sandy Land in the cold and arid region of China as an example,the optimum distribution range of the tree ring sampling sites was obtained through the application of the ORPOM model,which is considered a reasonably practical scheme.  相似文献   

A Statistical Model for Predicting the Average Abundance Patterns of Heavier Elements in Metal-Poor Stars     

Bo Zhang  Yan-Xia Zhang  Ji Li  Qiu-He Peng Department of Physics  Hebei Normal University  Shijiazhuang Center of Theoretical Nuclear Physics  National Laboratory of Heavy Ion Accelerator  Lanzhou National Astronomical Observatories  Chinese Academy of Sciences  Beijing Department of Astronomy  Nanjing University  Nanjing 《中国天文和天体物理学报》2002,2(5):429-440

We have collected nearly all the available observed data of the elements from Ba to Dy in halo and disk stars in the metallicity range -4.0 <[Fe/H]< 0.5. Based on the observed data of Ba and Eu, we evaluated the least-squares regressions of [Ba/Fe] on [Fe/H], and [Eu/H] on [Ba/H]. Assuming that the heavy elements (heavier than Ba) are produced by a combination of the main components of s- and r-processes in metal-poor stars, and choosing Ba and Eu as respective representative elements of the main s- and the main r-processes, a statistical model for predicting the Galactic chemical evolution of the heavy elements is presented. With this model, we calculate the mean abundance trends of the heavy elements La, Ce, Pr, Nd, Sm, and Dy with the metallicity. We compare our results with the observed data at various metallicities, showing that the predicted trends are in good agreement with the observed trends, at least for the metallicity range [Fe/H]> -2.5. Finally, we discuss our results and deduce some importa  相似文献   

Stellar SiO 86GHz Maser Observations of IRAS Point Sources     

Fu Haowen  Su Bumei  Li Yongsheng  Ji Kaifan 《天文研究与技术》1999,(Z1)

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