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2019 Vol. 6, No. 2
Published: 2019-04-20

 
1 Progresses and achievements of the National Oil and Gas Resource Strategic Constituency Survey Project
BAO Shujing, LI Shizhen, XU Xingyou, ZHANG Liqin, DU Zhili, LIN Tuo, TANG Yue, ZHANG Baomin, WEI Dongtao, YANG Jianguo
DOI: 10.19388/j.zgdzdc.2019.02.01
The “National Oil and Gas Resource Strategic Constituency Survey Project” led by Oil and Gas Resources Survey Center, China Geological Survey during 2016-2018, aims to realize the strategic discovery and breakthrough of oil and gas investigation in four new fields of “new district, new stratum, new type, new understanding”, and promote the new pattern creation of oil and gas exploration and development. According to the overall deployment and step-by-step implementation principles, the project organized three major scientific and technological battles, including the shale gas survey in Yangtze River Economic Belt, the shale oil survey in Songliao Basin and the oil and gas survey in the new strata of northern new area. On the basis of basic geological survey, the project evaluated a batch of favorable shale oil and gas target areas, and deployed two-dimensional earthquakes, parameter wells and fracturing gas test projects. The project initially found out the resource potential of the new strata in northern new area ,and realized a series of major breakthroughs and discoveries in the Lower Paleozoic shale gas in the middle reaches of Yangtze River, the Cretaceous Qingshankou Formation shale oil in Songliao Basin, the Neogene oil and gas in Wensu Sag of Tarim Basin, the Permian Lucaogou Formation oil and gas in the southern margin of Junggar Basin, the Jurassic Xishanyao Formation coalbed methane, and the Carboniferous-Permian oil and gas in Juyanhai Depression of the Yin’e Basin. These achievements have greatly boosted the exploration confidence in the southern complex structure area shale gas, continental shale oil and the northern new strata oil and gas, and promoted a deep integration of oil and gas geological survey and scientific and technological innovation, forming a new theoretical mechanism of hydrocarbon accumulation. The project played a leading role in the investigation of public welfare oil and gas resources.
2019 Vol. 6 (2): 1-17 [Abstract] ( 423 ) RICH HTML PDF (18338 KB)  ( 425 )
18 Study on geological conditions of Upper Permian shale oil and gas in Lower Yangtze area of southern Jiangsu-Anhui Province
SONG Teng, CHEN Ke, LIN Tuo, LI Haohan, MENG Fanyang
DOI: 10.19388/j.zgdzdc.2019.02.02
The Upper Permian marine-continental transitional shale developed extensively in Lower Yangtze area, with great thickness and rich organic matter content, but the exploration degree of this area is low and it lacks systematic analysis on shale oil and gas geological conditions. The burial depth of the shale in Dalong and Longtan Formations in southern Jiangsu-Anhui area is favorable, and the exploration wells deployed previously have obtained good oil and gas display. Based on previous data, the authors comprehensively analyzed the accumulation and preservation conditions of shale oil and gas in the Upper Permian shale in southern Jiangsu-Anhui Province by means of field investigation, core observation, test analysis and data comparison. The results show that the Upper Permian strata in this area have good hydrocarbon generation and reservoir conditions, and the differences in thermal evolution maturity are related to tectonic evolution, reflecting the differences in oil and gas preservation and enrichment conditions. Based on previous studies, we suggested that fine research on shale oil and gas preservation conditions and burial evolution history should be carried out in key areas to seek exploration breakthrough and to improve the exploration and development of shale oil and gas in the entire Lower Yangtze region.
2019 Vol. 6 (2): 18-25 [Abstract] ( 301 ) RICH HTML PDF (7051 KB)  ( 217 )
26 Important discoveries in Wuhe integrated exploration gold mine area in Anhui Province and its geological significance
WANG Qingsong, ZHANG Jiajia, ZHANG Shunlin, ZHU Yikun, ZHANG Jinhui, HAO Shuxi
DOI: 10.19388/j.zgdzdc.2019.02.03
In order to make a new breakthrough in the prospecting of the coverage area, a suitable inherited fracture-controlling model for Tan-Lu fault system and a comprehensive prospecting model for the coverage area were established. Then an experimental method for identifying thin conductors in the coverage area was carried out to study Wuhe integrated exploration area mineralization and ore-controlling regularity. The results show that the NNE-NE fault is the main ore-controlling structure of Wuhe integrated exploration area. The spatial distribution pattern of the ore body has a good correspondence with the magnetic anomaly pattern. Combined with the ‘repeated circulation of one selection, three confirmation, four stages’ comprehensive prospecting model, the low-frequency electrical magnetic exploration method, the ground-well charging method and the positive and negative potential method in the coverage area, better prospecting results were achieved in this area. The magnetic anomaly step belt is used to find the secondary fault of Tan-Lu fault zone, which is also the ore-controlling fault. These three prospecting methods mentioned above can be used accurately to locate the ore body, and finally two gold polymetallic mineral deposits were found in Wuhe integrated exploration area. It indicates that these ore-controlling, comprehensive prospecting models and new prospecting methods have some guiding significance on prospecting in Tan-Lu fault system and the coverage area.
2019 Vol. 6 (2): 26-33 [Abstract] ( 355 ) RICH HTML PDF (10645 KB)  ( 365 )
34 Temporal-spatial framework of structure and geological background of mineralization of Nachitai area in East Kunlun Mountains
DENG Hongbin, CHEN Yongdong, YANG Pengtao, YAO Bo, GUAN Yunbin, XU Lin, SUN Ping
DOI: 10.19388/j.zgdzdc.2019.02.04
Nachitai area is located in the middle part of East Kunlun metallogenic belt. In order to solve basic geology and mineral resources problems in this important metallogenic belt, 1:50 000 basic geological and mineral survey was conducted. The results show that strong strain zone and mylonitization zone are frequently alternate in the research area. The schistositized and mylonitized structures are common in the brittle-ductile shear zone, such as S-C fabrics, rotational porphyroclast and asymmetric folds. EW and NWW trending structures developed.The newly identified structural traces, combined with some newly discovered gold, copper, lead and zinc deposits and mineralization clues, are consistent with the majority of ore deposits, ore spots, and the occurrence of EW-NWW-toward linear tectonic belts in the region. This indicated a direct or indirect relationship between the mineralization and the structures. A closed relationship is shown between the EW and NWW structures and polymetallic deposits in time-space and genesis. Kunlun River ductile shear zone was formed in Late-Middle Silurian (432-423 Ma), which is similar to the newly discovered Erdaogou scheelite and Tongjinshan tungsten-tin ore in this reaserch area. This research shows that the potential of regional prospecting is great in this area.
2019 Vol. 6 (2): 34-41 [Abstract] ( 337 ) RICH HTML PDF (10751 KB)  ( 169 )
42 Research on controlling factors of the mercury and mercury-zinc deposits in Cambrian Aoxi Formation of Fenghuang area, Hunan Province
FU Shengyun
DOI: 10.19388/j.zgdzdc.2019.02.05
Fehuang mercury-lead-zinc ore field is located in central Hunan-Guizhou mercury belt, and several sedimentary-hot brine mercury and zinc ore spots occurred in Cambrian Aoxi Formation. In order to further search for mercury-zinc deposits, the regional metallogenic geological conditions, sedimentary facies and sedimentary evolution of Aoxi Formation were summarized, and the relationship between lithologic lithofacies and mercury, lead-zinc mineralization of Aoxi Formation was deeply studied, on the basis of previous data and field investigation. The results show that paleogeographic type of the rock facies of Aoxi Formation is the slope facies. The mercury and mercury-zinc deposits distributed roughly along the layer in calcite alteration of broken breccia between fine to fine-grained dolomitic strata in the upper member of Aoxi Formation, with a lateral distribution range of about 3-5 km. The mercury and mercury-zinc ore bodies appear to be layered, lenticular and capsule-like in the rubble dolomites and clastic dolomites. The related alteration types are carbonation and silication.
2019 Vol. 6 (2): 42-47 [Abstract] ( 351 ) RICH HTML PDF (7583 KB)  ( 332 )
48 Lithology identification and lithofacies distribution of Cenozoic volcanic rocks in Wichian Buri Sub-basin of Phetchabun Basin, Thailand
ZHU Xiaoer, YANG Shangfeng, SHI Chaoqun
DOI: 10.19388/j.zgdzdc.2019.02.06
The Cenozoic volcanic rocks are the main hydrocarbon-bearing layers in Wichian Buri Sub-basin of Phetchabun Basin in Thailand. However, the difficulties of lithology identification and uncertainty of lithofacies distribution have seriously restricted further exploration and development of hydrocarbon, due to various rock types related to the complex eruption environments and frequent eruption stages. In this paper, based on the data of cores, rock slice, logging and seismic, the characteristics of volcanic rocks in the study area were studied, and a set of methods for identifying volcanic rocks was established. Meanwhile, the volcanic eruption periods and lithofacies distribution were predicted. The research results show that: (1) weakly alkalic basalts are the main type in the multi-type volcanic rocks, ranging from basic to acid volcanic rocks and lava to pyroclastic in the study area; (2) GR, DEN and Pe well loggings are sensitive to the variation of volcanic rock composition, and FMI can provide information of textures and structures of volcanic rocks, so the combination of the two methods can effectively identify lithology of volcanic rocks; (3) Cenozoic volcanic rocks are the results of three-stage volcanic eruption, and several volcanic lithofacies, such as volcanic vent facies, effusive facies, explosive facies and volcanogenic sedimentary facies, and their distribution was identified and predicted. The conclusions in this paper can provide an effective method for lithology identification of Cenozoic volcanic rocks in study area, and make clear of its lithofacies distribution, which have a certain significance for further exploration and development of hydrocarbon in this area.
2019 Vol. 6 (2): 48-57 [Abstract] ( 325 ) RICH HTML PDF (11282 KB)  ( 153 )
58 Structure deformation characteristics of Shanxi uplift area during Yanshan movement period
LIU Kang, WEI Rongzhu, XU Shichao
DOI: 10.19388/j.zgdzdc.2019.02.07
During Yanshann movement period, the contractive structure deformation of the thrust fault and buckling folds formed as the basic structural elements is shown in Shanxi uplift area. Strata of different ages in this area have unique rock assemblage and physical properties, which may preserve and record deformation styles and characteristics at different levels of Yanshan structure. Through the study of surface geology, physiognomy and structure characteristics, we primarily concluded the “delaminate contractive deformation, and vertical stacking and thickening” structure mode. The balanced section method was applied to quantitatively estimate the horizontal shortening and vertical thickening effect, which were caused by nearly E-W shrinkage deformation. The section restoration showed that, before and after deformation, the horizontal shortening of the uplift area was about 32.8% in total. Cambrian bottom unconformity interface in the uplift area is about 5 km higher than that in Ordos Basin, due to vertical thickening. The intensive collision uplift and folding deformation resulted in the lateral shortening and vertical thickening in the upper part of the crust. Geological bodies are orderly vertically stacked and different levels of tectonic trace have shown great changes in spatial positions. Current spatial distribution of surface geological bodies, differences between northern and southern fold combination style and the along-the-trend segmentation of fracture all demonstrate the vertical stratification of tectonic deformation, due to late uplift and the difference of denudation degree on the surface.
2019 Vol. 6 (2): 58-67 [Abstract] ( 380 ) RICH HTML PDF (10502 KB)  ( 504 )
68 Study on gravel analysis and sedimentary characteristics of the Early Pleistocene gravel layers in Doumuhu district of southern Changde
LIU Gengyin, ZHAO Wei, WEI Fanghui, LUO Lai, ZHAO Ruicheng, LIANG Enyun
DOI: 10.19388/j.zgdzdc.2019.02.08
In order to determine the sedimentary characteristics and depositional environment of the Early Pleistocene gravel layers at the western edge of Dongting Basin, the authors systematically measured and counted several Quaternary gravel profiles in Doumuhu area of South Changde, based on the 1:50 000 geological survey. The results show that the gravels mainly come from the Cambrian or Precambrian strata. The gravel sorting coefficient Sa ranges from 1.16 to 1.64, with some measuring points of Sa>1.40, which indicates that the gravel layers are deposited with strong hydrodynamic force condition and some of gravel layers are rapid accumulation deposits. Most gravel is flat, with the gravel flatness F from 2.06 to 2.32, which is more than 2.0. The weathering degree of the gravel is low to moderate, with strong weathering degree in some gravel, which means that the weathering exposure exists during the gravel movement. The preferred orientation of gravels shows that the paleocurrents mainly come in the direction of SWW-NW, which indicates that the paleoceanography of the gravel deposition is much different from the modern topography. Through comprehensive comparison of the sections, the authors could conclude that the gravel layers are mainly braided fluvial sediments from alluvial-diluvial fans. The results can provide some new ideas about the sedimentary facies and paleoceanography of the layer gravel, and also support the exploration of the primary diamond deposits in this area.
2019 Vol. 6 (2): 68-75 [Abstract] ( 325 ) RICH HTML PDF (9394 KB)  ( 178 )
76 Geochemical characteristics and geological significance of argillaceous rocks of Early Cretaceous Jianmenguan Formation in Northern Sichuan Basin
XU Gang, WANG Yue, LIU Zichang, LV Hang, GAO Shufang
DOI: 10.19388/j.zgdzdc.2019.02.09
The Early Cretaceous Jianmenguan Formation is a good formation to study the sedimentary environment evolution in Northern Sichuan Basin. The systematical study on its geochemical characteristics is significantly important for studying the provenance, tectonic background, ancient weathering and paleoenvironment of Early cretaceous Jianmenguan Formation. In this paper, the geochemical characteristics of major elements, trace elements and rare earth elements (REE) of the argillaceous rocks of Jianmenguan Formation were systemically analyzed. The results show that the argillaceous rocks of Jianmenguan Formation are rich in CaO,MgO, lack Al2O3,Fe2O3,K2O,Na2O,TiO2,P2O5,MnO, are rich in Cr, Cs, V, and lack Sr, Nb, U, Hf. The total amount of REE(∑REE) ranges from 164.96×10-6 to 234.35×10-6. LREE/HREE is in the range of 11.77~15.87. The fractionation between LREE and HREE is obvious, and LREE content is higher than HREE, with a weak positive Eu anomaly. Based on the analyses above, Jianmenguan Formation is recycling sedimentary rocks from the same sources. Its source rocks are sedimentary rocks, and it may be rich in europium-rich minerals such as plagioclase and barite. The source rocks underwent moderate chemical weathering before sedimentation and K-metasomatisim during the weathering process. The climate during the sedimentary period of Jianmenguan Formation was warm and humid. Tectonic evolution characteristics of the source area appeared to have a transformation from the continental margin to the continental island arc.
2019 Vol. 6 (2): 76-86 [Abstract] ( 425 ) RICH HTML PDF (13756 KB)  ( 126 )
87 Temporal and spatial variation analysis of the coastline of northwestern Hainan Island
LI Li, WU Xing, GUO Ya
DOI: 10.19388/j.zgdzdc.2019.02.10
Based on remote sensing technology and GIS, using high spatial resolution remote satellite SPOT-5 and GF-2 image data, the authors analyzed the northwestern coastlines of Nandu River in Haikou City-Dongfang City of Hainan Island at two different periods in 2005 and 2016 with human-machine interactive method, and temporal and spatial variation characters in the past 10 years. The results show that temporal and spatial variation of the coastline is significant in northwestern Hainan Island, and the major factor contributing to the variation is the artificial development and construction. The artificial coastline growth rate reached 113%, and its ratio was increasing from 24.3% in 2005 to 51.6% in 2016. The parts of sludge shoreline and sand coastline were conversed to artificial coastline, and the natural coastline mainly suffered from erosion, with only a small amount of coastline being silted. Different coastlines have different variations. Danzhou City and Chengmai County are rich in coastline resources, with large development degree. Lingao County and Changjiang Li Autonomous County natural coastline is dominated by erosion, with less siltation. Dongfang City and Chengmai County have less coastline erosion and are more prone to siltation. The analysis results would provide some scientific reference for the investigation,development and protection of northwestern coastlines of Hainan Island.
2019 Vol. 6 (2): 87-93 [Abstract] ( 359 ) RICH HTML PDF (3872 KB)  ( 230 )
94 Research on karst fissure development pattern of the Ordovician buried hills in Tianjin
JIN Baozhen, YANG Yunxiao, QIU Jingwei, TIAN Xinmin, JIA Zhi
DOI: 10.19388/j.zgdzdc.2019.02.11
Ordovician is a promising bedrock thermal reservoir in Tianjin Plain. However, during the process of development, it is found that the karst fractures in this stratum are very uneven and the aquosity is quite different, which may bring difficulties to the construction and seriously hinder the development of geothermal resources. Therefore, the data of nearly 100 Ordovician geothermal wells in this city were compared and analyzed, and the development of Ordovician type I and type II fractures and the original water output in different tectonic units were statistically analyzed to summarize the development law of the karst fissure. The results show that the karst fissures are mainly distributed in Majiagou Formation with relatively pure limestone, followed by Liangjiashan Formation and Yeli Formation with relatively developed argillaceous limestone. In the areas with burial depth less than 2 300 m, the fissure development of Ordovician System increases with the increasing of formation thickness. The thickness of karst fissures in the overlying strata of Neogene and Mesozoic is thicker than that in the overlying strata of Carboniferous. The karst fissures in Shuangyao and Panzhuang uplifts are well developed and water-rich. Karst fissures are most developed near tensional faults. According to this, karst fissures are mostly distributed near tensional faults and Majiagou Formation with pure limestone, mainly uplift areas with shallow burial depth and Neogene and Mesozoic overlying strata. These areas are rich in water, which can provide reliable basis for geothermal development.
2019 Vol. 6 (2): 94-99 [Abstract] ( 335 ) RICH HTML PDF (2219 KB)  ( 319 )
100 Development characteristics and connectivity analysis of Buquan underground river in Guangxi Province
ZHANG Qinjun, ZHANG Yanian, BEI Weichang
DOI: 10.19388/j.zgdzdc.2019.02.12
To detect the karst development characteristics and distribution, long-term groundwater level was observed and groundwater tracer test was conducted based on the integrated 1:50 000 hydrogeological surveys in Buquan underground river of Guangxi Province. Surface and underground karst development chracteristics were summarized, and the connectivity of branches in the upstream and midstream of Buquan underground river was analyzed. The results show that this area is mainly peak cluster and depression landform with strong corrosion. The branch distribution of the underground river is along with faults, with dendritic planar form and ladder-shape profile form. Groundwater level has hysteretic response to precipitation in Buquan midstream and downstream, while it has sensitive response to precipitation in the upstream and the areas away form karst pipeline. The average flow rates are 1 166 m/d and 1 079 m/d for the upstream and midstream respectively, indicating fast groundwater flow. And groundwater in the Buquan upstream has larger hydraulic gradient than that in the midstream. Besides, the upstream has more river branches, suggesting complex groundwater connection. Pipelines in the midstream are clear and show better connectivity.
2019 Vol. 6 (2): 100-105 [Abstract] ( 338 ) RICH HTML PDF (7643 KB)  ( 215 )
106 Determination of the mining right boundary in the process of resource reserve estimation
WEI Qiang
DOI: 10.19388/j.zgdzdc.2019.02.13
How to determine the projection position of mining right boundary on the vertical projection chart has important practical significance for accurately delineating the scope of resource reserves estimation. Based on adequate study of the resource reserves estimation process, the author combined the current common geological mapping softwares, such as MapGIS and AutoCAD, constructed the three-dimensional mathematical model of the ore body, and deduced the trigonometric function to obtain the formula for determining the projection position of the mining right boundary on the vertical and horizontal projection map of the resource reserve. The projected position of the mining right boundary can be determined quickly and accurately on the vertical projection map of resource reserves. This method can provide data support for reasonable exploitation and utilization of resource reserves within the scope of mining right, and also provide technical support for the mining administrative department to approve and supervise resource reserves within the scope of mining right.
2019 Vol. 6 (2): 106-111 [Abstract] ( 481 ) RICH HTML PDF (7435 KB)  ( 271 )
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