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2018 Vol.27 Issue.5,
Published 2018-10-31
411
ANALYSIS ON THE COUPLING RELATIONSHIP BETWEEN LUXI UPLIFT AND JIYANG DEPRESSION IN WESTERN SHANDONG PROVINCE
SHEN Jin-chao, LI Shi-cheng, ZHANG Bin
By analyzing the crustal structure characteristics of Luxi Uplift and Jiyang Depression, combined with the spatial distribution, temporal evolution and tectonic correlation, it is found that there are obvious differences between the two neighbors in terms of crustal structure characteristics though both are in extensional tectonic environment. The Jiyang Depression is characterized by mirror structure of isostasy, while the crust of Luxi Uplift is upheaved, indicating their distinct differences in genesis. The extension of Jiyang Depression is not caused by active upwelling of mantle materials, but should be dragged by Luxi Uplift during the uplifting process, which reflects the significant coupling in genesis as well.
2018 Vol. 27 (5): 411-416 [
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417
SEDIMENTARY CHARACTERISTICS OF THE ALLUVIUM-DILUVIUM IN NORTHERN FUXIN OF LIAONING-HURE QI OF INNER MONGOLIA AREA
ZHAO Yan
The Quaternary alluvium-diluvium is widely distributed in the northern Fuxin of Liaoning-Hure Qi of Inner Mongolia region. Yet it is not easy to conduct in-depth research due to simple lithology and petrofacies with sharp variation in vertical and horizontal directions. According to the genesis, sporopollen and forming age, the Quaternary alluvium-diluvium can be divided into five mapping units, namely the Middle Pleistocene alluvium, Upper Pleistocene diluvium, Lower Holocene alluvium-diluvium, Middle Holocene alluvium and Upper Holocene alluvium. The distinctive sedimentary characteristics and environment of different periods of alluvium-diluvium contribute to different geomorphic features. The determination of depositional marks of alluvium-diluvium and detailed divisions can provide data for thorough study in the region and even North China.
2018 Vol. 27 (5): 417-423 [
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424
ZIRCON U-Pb CHRONOLOGY OF QUARTZ MONZOPORPHYRY IN JIAWULA Pb-Zn-Ag DEPOSIT, DAXINGANLING MOUNTAINS: Geological Implications
LIU Gui-xiang, ZHANG Chun-peng, LYU Jun-chao, ZHANG Peng
The Jiawula Pb-Zn-Ag Deposit, one of the large-scale deposits in the Derbugan Cu(Mo)-Ag-Pb-Zn metallogenic belt in the western slope of Daxinganling Mountains, genetically has long been considered as epithermal type related to volcanic-subvolcanic hydrothermal process. The chronology of ore-bearing quartz monzoporphyry is studied on the basis of field investigation. The results show that the LA-ICP-MS zircon U-Pb is dated 152.2±1.5 Ma. Combined with previous diagenetic and metallogenic chronology researches, it is thought that the Jiawula Deposit was formed in Late Jurassic to the early stage of Early Cretaceous, contemporaneous with similar deposits in the region, which is a product of post-collisional orogeny extensional tectonic setting after the closure of Mongolia-Okhotsk Ocean.
2018 Vol. 27 (5): 424-430 [
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431
GEOLOGICAL CHARACTERISTICS AND PROSPECTING INDICATORS OF WOMAGOU GOLD-COPPER DEPOSIT IN QINGHAI PROVINCE
LUO Chang-hai, LIU Shi-bao, LI Fu-jun, MA De-qing, QIAO Jian-feng, YUN Qi-cheng
The Womagou gold-copper deposit, located in the Ela Mountain area of eastern Kunlun metallogenic belt, is occurred in the Early-Middle Triassic Longwuhe Formation as stratoid and lentoid structures, strictly controlled by the E-W-and NE-trending faults. Currently, two gold and ten copper ore/mineralized bodies were found, with deposits dominated by the epi-mesothermal magmatic and structural altered rock types. Based on the analysis of geological, geophysical and geochemical characteristics, it is thought that Ag is well correlated with Au and Cu, and has a great metallogenic potential, thus more attention should be paid in future prospecting. Further analysis shows that the sand slate of Longwuhe Formation serves as the main source bed in the area. The secondary interlayer fissures derived from the E-W fault provide favorable positions for the enrichment of orebodies. The soil anomalies of Au and Cu, banded and beaded low-gentle magnetic anomalies and IP anomalies with low resistance and high polarization are important prospecting indicators for gold-copper deposits.
2018 Vol. 27 (5): 431-437,416 [
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438
DISCUSSION ON THE OIL-GAS EXPLORATION PROSPECTS OF LINXI FORMATION IN SOUTHERN DAXINGANLING REGION
WU Tong, ZHOU Tie-suo
Based on the outcrop informaiton, the organic geochemical analysis technique is applied to study the Linxi Formation in southern Daxinganling region and the development of source rocks for favorable exploration directions. The results show that the Upper Permian Linxi Formation is widely developed, which was mainly deposited in the delta-lacustrine environment. The total organic carbon (TOC) of dark mudstone from the formation is medium in content, with organic matter types of Ⅱ
2
-Ⅲ and thermal evolution reaching the high-post mature stage. From the above, the oil-gas exploration should keep away from the intrusive rock areas. The areas covered by Mesozoic strata have better storage and caprock conditions.
2018 Vol. 27 (5): 438-444 [
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445
GEOCHEMISTRY OF THE SOURCE ROCKS FROM JIUFOTANG FORMATION IN JD1 WELL, SOUTHWESTERN SONGLIAO BASIN
SUN Lei, BIAN Xiong-fei, HE Da-xiang, ZONG Wen-ming, HUANG Xin, ZENG Zhen, ZHANG Jian, SU Fei
Through systematic evaluation on the organic geochemical and biomarker compound features of source rocks from Jiufotang Formation in JD1 well in Jinbaotun-Jargalang region of southwestern Songliao Basin, the authors conclude that the dark mudstone belongs to poor-medium grade source rocks with organic matter of II-type kerogen in low maturity-maturity stage. The n-alkanes are dominated by unimodal distribution of "front type" with main peak carbon numbers of C18 and C19. The odd-even predominance is not prominent. The Pr/Ph ratios(0.24-0.46) and gammacerane indexes (0.11-0.32) indicate the source rocks were formed under reduction condition with freshwater-brackish water lacustrine sedimentary environment. The distribution characteristics of C27-C28-C29 regular steranes are slightly various, reflecting mixed sources of organic matters. From the above, the source rocks in the study area have certain hydrocarbon generation potential.
2018 Vol. 27 (5): 445-453 [
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454
FAULT CONTROL ON THE SEDIMENTARY DIFFERENCES OF THE LOWER MEMBER OF GUANTAO FORMATION IN TANHAI AREA, SHENGLI OILFIELD
GAO Liang, WANG Guan-min, LUO Xia, FAN Ming, YANG Jian-lei, WANG Wei
Taking the Lower Member of Guantao Formation in Tanhai area, Shengli Oilfield for example, the syn-sedimentary faults in different blocks are studied according to the logging, seismic and core data. It is found that the sedimentary differences between the two walls of faults are related to the active intensity of syn-sedimentary faults and supply rate of sediments, and the relationship between fault strike and river mainstream direction as well. Based on further research, two cases of sandbody controlling model are summarized as follows:When the fault is perpendicular to flow direction, due to small space in upthrown side, the sandstone is cut and overlaid, dominated with large blocks of sand. The mudstone is difficult to preserve, thus the percentage of sandstone is high. While the sandstone on downthrown side is mostly isolated and in thick single-layer, but the mudstone is more developed. Therefore the sandstone is in low percent. When the fault is parallel to flow direction, the sandstone on upthrown side is less and thin with low percentage; while that on downthrown side is more and thicker with high percentage.
2018 Vol. 27 (5): 454-459,465 [
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460
ANALYSIS ON THE PROVENANCE AND FAVORABLE AREA OF THE E
s
3
5 LAYER IN DONGXIN OILFIELD, SHANDONG PROVINCE
HUANG Yi-wang, WANG Yong-qiang, ZHONG Jian-hua
By analyzing the structural characteristics of No.4 sub-layer, the 5th sand set of the 3rd Member, Shahejie Formation (E
s
3
) in Dongxin Oilfield, a small fault in the southern part is determined as a reverse fault, making uplift in the north and depression in the south, which provides the trap condition for oil-gas accumulation. The study on the sand body and formation thickness indicates that the provenances are from the south, west and northeast rather than north. Finally, with analysis on the porosity, permeability and effective thickness of sand body, it is found that the most favorable exploration areas are the south and mid-west regions, followed by northeast region, while the mid-east region is of little significance for exploration.
2018 Vol. 27 (5): 460-465 [
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37
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466
ENRICHMENT REGULARITY OF Y-9 RESERVOIR IN CAOYAOXIAN AREA OF JINGBIAN OILFIELD, ORDOS BASIN
LEI Hua-wei, HAN Hua-feng, QIAO Li, WANG Long-jun, LI Gang, BAI Yu-bin
The enrichment of Y-9 reservoir in Caoyaoxian area of Jingbian Oilfield is studied by the overlaying analysis of geological condition and reservoir distribution based on the discussion of oil-water distribution characteristics and reservoir types. The results show that the Y-9 reservoir is chiefly distributed in the Y-9
2
2
layer vertically, with obvious edge and bottom water, dominated by structural and structural-lithologic composite reservoirs in terms of types. The enriched horizons and areas are controlled by the effective combination of distribution and scale of meandering stream sand body, culmination position of reservoir top, and thickness and distribution of direct caprock as well. In the eastern region, oil is the most abundant at the structural culmination where sand body is more than 10 m thick.
2018 Vol. 27 (5): 466-471 [
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472
CONTROLLING FACTORS OF THE SHALE GAS ENRICHMENT IN TAIYUAN AND SHANXI FORMATIONS OF ZHONGMU BLOCK, HENAN PROVINCE
QIU Qing-lun, LI Zhong-ming, FENG Hui, DONG Guo-guo, DAI Lei
The MY-1 well in Zhongmu block of Henan Province is the first shale gas exploratory well with marine-continental transition facies in southern North China. A total natural gas production of 1256m
3
per day is obtained through test fracturing in Taiyuan and Shanxi formations. Based on the comprehensive researches on MY-1 well and seismic data, it is believed that the enrichment and productivity of shale gas in both formations depend on the original deposition and later preservation conditions. The peat bog and lagoon subfacies are most favorable for the development of shale gas. Large thickness and high content of TOC are important evaluation indexes for target selecting. Many of faults in the block thrust up to the surface, with caprock of mudstone rather than better sealed gypsum salt rock, indicating the overall preservation conditions are ordinary. Therefore, under the similar conditions of geochemical indexes, thickness, burial depth, sedimentary facies and caprock of shale gas layers, the key to further exploration is to search for areas with relatively stable structures.
2018 Vol. 27 (5): 472-479 [
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480
PRELIMINARY STUDY ON THE ENVIRONMENTAL BACKGROUND VALUES OF GROUNDWATER IN MIDDLE YARLUNG ZANGBO RIVER BASIN, TIBET
GENG Ting-ting, LI Ying-zhi, ZHANG Tao, ZHANG Zhi-yin, ZHAO Miao
Based on the analysis and comparison of domestic and foreign research methods, with discussion of application principle, data verification and background values, the mathematical statistics are adopted to study the environmental background values of quality indexes such as TDS, Ca
2+
, Mg
2+
and Na
+
of the groundwater in Middle Yarlung Zangbo River Basin of Tibet, as well as the spatial distribution and controlling factors of the indexes. The results show that spatial distribution is mainly affected by topography and regional hydrodynamic conditions, which provides scientific references for the evaluation on groundwater pollution status in the study area.
2018 Vol. 27 (5): 480-487 [
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488
RESEARCH PROGRESS ON THE FAILURE MECHANISM OF UNSTABLE ROCK
ZHANG Tao
The unstable rock collapse is a major global geological disaster with the characteristics of mutability, concealment and rapidity. Yet its failure mechanism is still uncertain, thus the research has received more and more attentions from geotechnical engineering circle. The advantages and disadvantages of various methods are compared based on the current linear and nonlinear scientific research results of failure mechanism. By establishing physical and mechanical models, the loads acting on unstable rocks are all concentrated on control fissures, which generalize the mechanical analysis steps. The limitations of quasi-statics theory in solving problems about unstable rocks are also discussed. From the above, the paper makes prospects on the research trends of failure mechanism of unstable rocks and proposes several directions for further research.
2018 Vol. 27 (5): 488-493 [
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494
APPLICATION OF GEOPHYSICS IN THREE-DIMENSIONAL GEOLOGICAL SURVEY: A Case Study of Benxi-Linjiang Area
SHI Bin
Taking the Benxi-Linjiang area for example, the interpretation of aeromagnetic, gravity and electrical profiling data can provide geophysical basis for the inference of strata, structures, rock mass and orebodies of deep geology. The geological maps and sections are drawn to establish the three-dimensional geological model. By geophysical information processing, with analysis on the metallogenic mechanism of the Anshan-type iron deposit, several potential deposits are discovered in the exploration area.
2018 Vol. 27 (5): 494-502 [
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