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2020 Vol.29 Issue.4,
Published 2020-08-30
301
STUDY ON THE SEQUENCE STRATIGRAPHY OF SINIAN GANJINGZI FORMATION IN DALIAN REGION, LIAONING PROVINCE
WU Zi-jie, ZHANG Guo-ren, QIU Long-wei, GAO Fu-liang, ZHONG Mi-shan, PAN Yu-qi, GAO Yong-zhao
The Ganjingzi Formation of Dalian region is an important Neoproterozoic stratigraphic horizon in Liaoning Province where lots of carbonate rocks are developed. Based on the classical sequence stratigraphy theory, through the comprehensive analysis of field survey sections, the sequence stratigraphy of Sinian Ganjingzi Formation in Dalian is studied, and 5 sequence boundaries are identified, which are further divided into 4 third-order sequences, 15 parasequence formations and 55 parasequences. The sedimentary facies of carbonate rocks can be divided into restricted platform and open platform subfacies, and subdivided into lagoon, tidal flat, low-energy subtidal and shoal microfacies. The regional tectonics and astronomical cycles are used to discuss the environmental evolution of Ganjingzi Formation. It is believed that process went through restricted platform→open platform→restricted platform. Under the influence of low-amplitude tectonic uplift and subsidence at the end of Yangtze cycle, 5 short times of exposures took place during the late Nanguanling period-Ganjingzi period in Dalian area, which formed 5 sequence boundaries. Meanwhile, effected by periodic astronomical cycles, the high-frequency cycles of parasequences are formed. The study on the sequence stratigraphy and sedimentary evolution of Ganjingzi Formation in Dalian region provides a basis for the oil-gas exploration in southeastern Liaoning Province.
2020 Vol. 29 (4): 301-309 [
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310
ZIRCON U-Pb DATING AND GEOCHEMISTRY OF THE RHYOLITES FROM XINMIN FORMATION IN SANGENHE FOREST FARM, NORTHERN DAXINGANLING MOUNTAINS
LI Zhong-hui, LI Yang, LI Rui-jie, LI Kai
The volcanic rocks of Xinmin Formation in Sangenhe forest farm are mainly composed of rhyolites and rhyolitic ignimbrites. The U-Pb dating results indicate the rhyolites were formed in Middel Jurassic, with the age of 165.71±0.83 Ma. The petrogeochemical analysis shows that the rhyolites are characterized by relatively high silicon, alkali and peraluminous, with the SiO
2
content of 71.05%-76.77%, Na
2
O+K
2
O of 6.66%-8.49% and A/CNK of 1.02-1.17. The rocks present medium total REE content, significant fractionation of HREEs and LREEs, strong negative Eu anomaly (
δ
Eu=0.39-0.66) and negative Dy anomaly, relative depletion of LILEs (Ba and Sr), enrichment of HSFEs (Th and U) and relative depletion of Nb, Dy and Ti, with the characteristics of A-type rhyolites. The study shows the magma is derived from partial melting of crustal materials. The Xinmin Formation is spatially distributed along the middle-north section of Daxinganling volcanic belt, revealing the volcanic belt was in a tensional tectonic environment in Middle Jurassic.
2020 Vol. 29 (4): 310-318 [
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117
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319
GEOCHEMISRY OF THE MYLONITIZED SILICEOUS BANDED LIMESTONE IN CENTRAL LANGSHAN AREA, INNER MONGOLIA
LIU Shao-chang, ZHOU Yang, LI Hao, DAI Bo-yang, MING Xiao-na, YANG Jian-qiang
The Langshan tectonic belt is an important part of the giant orogenic belt in the north margin of North China Platform, with ductile shear zone as one of the major structural styles, reflecting deep structure of the crust. The geochemical characteristics of the mylonitized siliceous banded limestone in the southwest of Langshan Ⅱ ductile shear zone are discussed to study the composition changes of the mylonitized rock from protolith in different deformation strength. The analysis results show that, compared with the content of the protolith, there are differences of major and trace elements in the siliceous banded limestone by deformation strength. Among the major elements of deformed rocks, only CaO is the exported component, all the others are imported ones. The trace elements such as Rr, Sr, Ba, Pb, Ti, Cr, Cu, Nb, Ta, Zr and Hf are enriched and Ni relatively deficient. The REE distribution patterns of deformed siliceous banded limestone and protolith are basically consistent, which are characterized by right-dipping curves with enrichment of LREEs and depletion of HREEs, and obvious negative Eu anomaly, indicating the REEs have relative stability and homology during ductile shearing.
2020 Vol. 29 (4): 319-326,318 [
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85
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327
MULTI-SOURCE INFORMATION ANALYSIS AND PROSPECT PREDICTION OF URANIUM MINERALIZATION IN DONGGOUYING BASIN, INNER MONGOLIA
ZHANG En, SUN Jing-bo, LU Hui-xiong, FENG Bo, WANG Qing, CAO Qiu-yi, YANG Yan-chao, CHENG Xu
Donggouying basin is located in the north section of Zhalantun uranium metallogenic prospective belt, with superior mineralizing geological conditions. Due to the thick forest coverage and poor transportation, the degree of uranium geological survey is low and prospecting progress is slow. Based on the regional uranium mineralization geological background, by analyzing the ore-controlling factors of typical uranium occurrences, combined with the multi-source information of airborne radioactivity, geochemistry and remote sensing, the paper constructs the integrated prospecting model for volcanic-type uranium deposits. Compared with the typical volcanic-type uranium deposits in adjacent areas, the prospect analysis concludes that the study area has a good prospecting potential. According to the prospecting model, combined with the geological, physical-chemical-remote sensing integrated prospecting information, 4 favorable areas for uranium mineralization are delineated, among which 3 are newly-delineated, with superior metallogenic conditions, abundant prospecting clues and good prospecting potential.
2020 Vol. 29 (4): 327-334,373 [
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75
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335
A NEW TYPE OF OIL SANDS IN THE BEIPIAO FORMATION OF JINYANG BASIN, WESTERN LIAONING PROVINCE: Geochemical Characteristics and Geological Implication
SUN Peng, TANG You-jun, ZHANG Kun
The occurrence of oil and gas is discovered in the Beipiao Formation of SZK04 well located on the western margin of Zhangjiyingzi Sag in Jinyang Basin. The organic geochemical analysis results show that such oil sands are characterized by low pristane-phytane ratio, abundant hopane compounds, high gammacerane content, deficiency of sterane compounds and light carbon isotopes. Combined with the biomarker compounds and carbon isotope values, it is believed that the source rocks deposited in marine reduction environment should contribute to the oil sands of SZK04 well, with the organic matter mainly from bacterial input. Considering the geological background of the area, it is concluded that the type of marine oil sands may come from the MesovNeoproterozoic source rocks, which provides a basis for the Meso-Neoproterozoic oilvgas exploration in Jinyang Basin and even the western Liaoning Province.
2020 Vol. 29 (4): 335-341 [
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84
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342
EFFECT OF VERTICAL SUBDIVISION OF COMPUTING UNITS ON RESERVE PARAMETERS AND RESULTS OF MULTILAYER STRUCTURAL RESERVOIR
YAN Guan-shan, LIU Zong-bin, SONG Hong-liang, HAN Xue-fang, WANG Xin-ran
For precise exploitation of oilfield in the middle-late stage and further adjustment and potential tapping, it is urgent to carry out more detailed study on reserves, among which the most important is vertical subdivision of computing units. For multilayer structural reservoir, the vertical subdivision is based on the distribution characteristics of interlayers and physical properties of single layer within the oil formation, taking single layers or layer combination with similar distribution characteristics or physical properties and continuously distributed vertically as computing units. According to the theoretical deduction of reserve optional parameters before and after the vertical subdivision of computing units, combined with the sedimentary distribution characteristics of reservoir, it is considered that when there is no reservoir pinch-out within the oil-bearing area, only the average effective thickness of reservoirs with large difference in the plane reservoir thickness are reduced. In the case that the reservoir is pinching out, the reservoir parameters of normal delta sedimentary reservoirs generally decrease; while the average effective thickness of braided river delta sedimentary reservoir decreases, and the average effective porosity and average oil saturation increases. The conclusions can effectively guide the vertical subdivision of computing units in reserves evaluation and provide technical support for the study of precise reserves in similar oilfields.
2020 Vol. 29 (4): 342-350 [
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65
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351
VOLCANIC ALTERATION OF NANPU-5 STRUCTURE IN BOHAI BAY BASIN: Effects on the Physical Property of Reservoir and Lower Limits of Physical Property
ZHANG Li-hua, PAN Bao-zhi, SHAN Gang-yi, LIN Fa-wu, LIU De-fang
Study of thin sections and scanning electron microscope(SEM) data confirms that the volcanic reservoir in Nanpu-5 structure has been altered with different degrees. Based on the alteration mechanism of volcanic rocks, the effects of volcanic alteration on physical property of reservoir are analyzed. The methods of empirical statistics, porosity-permeability intersection, mercury injection parameters, stress sensitivity and minimum oil throat radius are applied to determine the lower limits of physical property, which are defined by porosity of 2.5% and permeability of 0.04×10
-3
μm
2
. The determination of lower limits is conducive to the division of reservoir and non-reservoir, statistics of effective thickness and calculation of reserves. The study provides reference for the determination of physical property lower limits of altered volcanic rocks in other areas.
2020 Vol. 29 (4): 351-356 [
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64
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357
STUDY ON QUANTITATIVE INVERSION OF REMOTE SENSING FOR ORGANIC CARBON IN THE TYPICAL BLACK SOIL AREAS OF NORTHEAST CHINA
YANG Jia-jia, LIN Nan, YU Xiu-xiu, WU Meng-hong, WANG Yang
The quantitative inversion of soil organic carbon (C
org
) in the study area is conducted by using multiple stepwise regression analysis method in combination with Landsat8 OLI remote sensing data. For the test, 164 soil samples are collected. Singular points are removed and data sets are divided by tripled standard deviation. Among the total, 120 samples are chosen as the training set and the other 44 as the validation set to establish the multiple stepwise regression prediction model for C
org
. The results show that the organic carbon is significantly correlated with the reflectivity of Landsat8 bands. The optimal model for the prediction of black soil organic carbon spectrum is the one that takes the reciprocal as the independent variable, with the determination coefficient
R
2
=0.180, and root-mean-square error(RMSE)=0.558. Hailun area is suitable for remote sensing inversion of C
org
content, with a stable prediction model, which can be used to reveal the spatial distribution of C
org
content in typical black soil areas. Meanwhile, it is believed that without ground spectral test for the soil, the fitting degree of prediction model by simply using the method of associating chemical analysis data with remote sensing satellite is limited and the interpretation of C
org
by spectrum is poor.
2020 Vol. 29 (4): 357-362 [
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363
ANALYSIS ON THE APPLICATION EFFECT OF INTEGRATED ELECTRICAL METHOD IN WATER PROSPECTING IN GRANITE REGIONS
SHI Yan-fang, Li Bo
As granite regions are generally short of groundwater, it is relatively difficult to find water, and the results of using a single geophysical method are often unsatisfactory. In recent years, through a series of 1:50000 hydrogeological surveys, the integrated electrical method is used to determine several well locations in granite regions, which all have obtained satisfactory results. Two examples of locating wells are selected to analyze the electrical characteristics of the high-density electrical profile and IP sounding curve in the relatively water-rich granite regions. The practices prove that the combination of high-density electrical method and IP method can improve the efficiency and accuracy for locating wells, and can also be used as reference for water prospecting in similar strata.
2020 Vol. 29 (4): 363-368 [
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369
DYNAMIC CHARACTERISTICS AND DIFFERENCE ANALYSIS OF THE GROUNDWATER IN CHANGCHUN NEW DISTRICT
SUN Qi-fa, SUN Zhuo-an, TIAN Hui, GUO Xiao-dong, YU Hui-ming, LI Xu-guang, LI Xiao
To further identify the hydrogeological conditions and find the dynamic rule of groundwater of the Changchun New District in Yinma River Basin, the dynamic analysis, contrast coefficient variance analysis and correlation analysis are conducted on the basis of observation data of groundwater during 2016-2018. It is considered that the dynamic characteristics of groundwater are mainly infiltration-evaporation type and infiltration-exploitation type. Groundwater is mainly replenished by precipitation. The water level is affected by both rainfall and mining, with obvious spatial variation. There are notable yet different negative correlations between the groundwater depth and precipitation.
2020 Vol. 29 (4): 369-373 [
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374
ANALYSIS ON THE HYDROGEOLOGICAL CHARACTERISTICS OF LUANHE ALLUVIAL PLAIN IN LUANXIAN-LUANNAN SECTION, HEBEI PROVINCE
YANG Qin-hong, ZUO Wen-zhe, ZHU Bin
The total reserves of the iron deposit group in Luanhe alluvial plain of Luanxian-Luannan section, including Sijiaying iron orefield, Macheng iron orefield, Kanshang iron orefield, Changyu iron mine and Gaoguanying iron mine, amount to billions of tons. All of them are covered with huge thick Quaternary water-bearing bodies. Mining is impossible due to complex hydrogeological conditions. Being watery unminable metal ore fields, they have been regarded as the water-abundant mining areas that the regional hydrogeological environment might be greatly affected in the exploitation, and labeled as restricted mining areas. It is not until the beginning of the 21st Century that these mines are put into production successively. By analyzing the hydrogeological conditions of the iron deposit group, the paper discusses the hydrogeological characteristics of Luanhe alluvial plain in Luanxian-Luannan section.
2020 Vol. 29 (4): 374-379,362 [
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100
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380
STUDY ON THE DYNAMIC CHANGES OF SPRING FLOW, CONDUCTIVITY AND pH VALUE
YU Bao-wen, XIAO Min-jie, WANG Xu, FEI Xuan
Karst water, referring to the groundwater that is hosted in karst pores, serves as the major water source for production and life in southern China. With the increasing social demand for water, the development and utilization of karst water resources is becoming more and more important. By regularly monitoring the spring flow, conductivity and pH value of Yuelu Mountain, combined with the rock-soil layer property of Yuelu Mountain and rainfall of Changsha City, the statistical analysis and Spearman rank correlation coefficient method are used to study the spring flow changes and qualitatively evaluate the water quality. The results show that rainfall replenishes karst water and increases spring flow. The spring flow is not only related to rainfall but also affected by soil infiltration rate and rainfall duration. The Spearman rank correlation coefficient method can be used to quantitatively calculate the correlation between conductivity and time, and indirectly judge the influence of surrounding environment on spring water quality, which is conducive to identify the representative location of conductivity, better monitor and evaluate karst water. The pH value of karst water tends to be acidic in areas with serious acid precipitation pollution of soil or frequent acid rain. The study of spring flow and water quality is beneficial to scientific development and utilization of karst water.
2020 Vol. 29 (4): 380-387 [
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118
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388
STUDY ON THE COMPREHENSIVE EVALUATION METHOD OF GEOENVIRONMENTAL RADIOACTIVITY OF COALFIELDS IN NORTHEAST CHINA
LIU Qiang, JIN Hong-tao, ZHU Wei, TIAN Hui, ZHANG Sen, JU Nan, ZHANG Yan, YAN Xiao-ming
By screening the natural radioactive logging data to obtain the continuous radioactivity data of strata, according to the position relation between anomaly layer and coal seam, the paper recognizes 4 types of anomalies, including coal seam, inter-coal seam, above-coal seam roof and below-coal seam floor, and establishes a comprehensive evaluation method for radioactivity in primary geological environment of coalfields. Through the analysis of evaluation method and result, it is believed that the geoenvironment of Bayanshan coalfield, Huhenuoer coalfield, Fuxin coalfield and Pingzhuang coalfield in Northeast China are obviously radioactive, thus the exploitation should attach importance to the environmental impact of radionuclide migration.
2020 Vol. 29 (4): 388-396 [
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86
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397
DISCOVERY OF THE EARLY PALEOZOIC ARC-CONTINENT COLLISION IN NORTHERN LIAONING PROVINCE: Tectonic Implication
SHI Yi, SHI Shao-shan, SHU Guang-long
The research team from Shenyang Center of China Geological Survey, Ministry of Natural Resources, initially identified an arc-continent collision during the geological survey in Faku area of northern Liaoning Province. According to geochronology study, it is considered the collision occurred mainly in the Early Paleozoic. The discovery provides a significant basis for the study of Early Paleozoic tectonic evolutionary history of Songliao Basin coverage area in the northern margin of North China Plate.
2020 Vol. 29 (4): 397-400 [
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77
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401
PROGRESS OF THE GEOLOGICAL SURVEY FOR OIL-GAS IN SURROUNDINGS OF SONGLIAO BASIN
CHEN Shu-wang, LI Yong-fei
2020 Vol. 29 (4): 401-401 [
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58
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402
PROGRESS OF URBAN GEOLOGICAL SURVEY IN NORTHEAST CHINA
CUI Jian, NI Jin, MA Hong-wei, SUN Xiu-bo, ZHU Wei, LI Xu-guang, DAI Ya-jian, ZHAO Hai-qing
2020 Vol. 29 (4): 402-402 [
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66
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