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Diagenesis and Restructuring Mechanism of Oil and Gas Reservoir in the Marine Carbonate Formation,Northeastern Sichuan:A Case Study of the Puguang Gas Reservoir

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Acta Geologica Sinica(English Edition) 2009年第6期83卷 1173-1181页

作者： DU Chunguo1, 2. WANG Jianjun1, ZOU Huayao2. ZHU Yangming3.and WANG Cunwu4 1 Research Institute of Petroleum Exploration and Development, Beijing 10003., china 2.Petroleum University of china, Beijing 102.49, china 3.Department of earth Science, Zhejiang University, Hangzhou 3.002., china 4 faculty of earth Resources, china University of {13., wuhan 43.074, china faculty of earth Resources China University of Geosciences Wuhan 430074 China

Based on the technology of balanced cross-section and physical simulation experiments associated with natural gas geochemical characteristic analyses, core and thin section observations, it has been proven that the Puguang gas reservoir has experienced two periods of diagenesis and restructuring since the Late Indo-Chinese epoch. One is the fluid transfer controlled by the tectonic movement and the other is geochemical reconstruction controlled by thermochemical sulfate reduction (TSR). The middle Yanshan epoch was the main period that the Puguang gas reservoir experienced the geochemical reaction of TSR. TSR can recreate the fluid in the gas reservoir, which makes the gas drying index higher and carbon isotope heavier because C2. (ethane and heavy hydrocarbon) and 12. (carbon 12.isotope) is first consumed relative to CH4 and 13. (carbon 13.isotope). However, the reciprocity between fluid regarding TSR (hydrocarbon, sulfureted hydrogen (H2.) , and water) and reservoir rock results in reservoir rock erosion and anhydrite alteration, which increases porosity in reservoir, thereby improving the petrophysical properties. Superimposed by later tectonic movement, the fluid in Puguang reservoir has twice experienced adjustment, one in the late Yanshan epoch to the early Himalayan epoch and the other time in late Himalayan epoch, after which Puguang gas reservoir is finally developed.

关键词： diagenesis and restructuring mechanism marine carbonate formation thermochemical sulfate reduction Puguang gas reservoir

Evolution Mechanism of Slip Zone Under Fluctuation of Ground Water Table of Landslide

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地学前缘 2009年第S1期16卷 55-56页

作者： Bo Chai~1,Kunlong Yin~2.1.School of Environmental Studies,china University of geosciences({2.),{2. 43.074,china. 2.Engineering faculty,china University of geosciences({2.),{2. 43.074,china

The fluctuation of ground water table of landslide caused by the changing of rain fall and reservoir water level leads the slip zone to possess the complicated deformation features of stepped and *** role of the groun... 详细信息

关键词： groundwater fluctuation slip zone landslide

SHRIMP Zircon U-Pb Ages and Geochemical Characteristics of the Neoproterozoic Granitoids in the Huangling Anticline and Its Tectonic Setting

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Journal of earth Science 2012年第5期23卷 659-675页

作者：魏运许彭松柏蒋幸福彭中勤彭练红李志宏周鹏曾雄伟 wuhan Institute of Geology and Minerals Resources Wuhan Center of Geological Survey faculty of earth {2. China University of Geosciences Three Gorges Research Center for Geo-hazard Ministry of EducationChina University of Geosciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

SHRIMP zircon U-Pb dating of the Neoproterozoic Maoping （茅坪） series （Sandouping （三斗坪） rock suite） granites exposed in the southern part of the Huangling （黄陵） anticline shows that the formation time of Sandouping biotite-hornblende tonalite intrusion, Jinpansi （金盘寺） hornblende-biotite tonalite intrusion, and Longtanping （龙潭坪） monzogranite are 863.9, 842.10, and 844±10 Ma, respectively. Their geochemical features include A/CNK=0.98-1.06, from metaluminous to weakly peraluminous, δ=1.3.-1.53. Sm/Nd=0.17-0.2., and RbN/YbN=1.1-3.62. These indicate that the granite rocks are supersaturated SiO2.calc-alkaline granitoids. The characteristic of Sr-Nd isotopic composition is that the values of εNd（t） and εsr（t） are -12.4 to -11.0 and 2..2.3.0}2. respectively. It also suggests that the material source of the granite rocks mainly originated from the crust, and they formed in a volcanic arc tectonic environment. These facts suggest that the occurrence of Neoproterozoic granitoids in the southern part of the Huangling anticline should be related to an arc environment along an active continental margin caused by southward subduction of oceanic crust beneath the northern Yangtze craton, and the formation age is not later than 863.Ma.

关键词： Huangling anticline Yangtze plate Neoproterozoic granitoid SHRIMP zircon U-Pbdating geochemistry tectonic setting.

Peat molecular fossils recording paleoclimatic change and organism replacement

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Chinese Science Bulletin 2001年第20期46卷 1749-1752页

作者： XIE Shucheng & R. P. Evershed1. faculty of earth Science,{2. University of {3., wuhan 43.074,{2. 2. School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK Correspondence should be addressed to Xie Shucheng (e-mail: scxie@ ***) faculty of earth Science China University of Geosciences Wuhan China School of Chemistry University of Bristol Bristol

The occurrence of the dominant C2. n-alkane derived from bryophyte was demonstrated to be related to the cold climate, based on the GC and GC/MS analyses on a 40-cm long peat core, in which this compound exponentially varies in abundance with the depth corresponding to the well-known second Little Ice Age. Both the variation of the chemical components of modern bryophyte resulted from climatic change and the ecological data about the biological growth influenced by climate shed light on the point that the variation of this compound in the peat was related to the cold climate. This was also evidenced by the previously-reported lacustrine data. In addition, the variations of the ratios of ketones/esters and C2. n-alkene/n-alkane (C2.:1/02.:0) display the trend identical with that of organisms, implicating the replacement between bryophyte and monocotyledon occurring in the peat core.

关键词： bryophyte molecular fossil n-alkane paleoclimate Little Ice Age peat lacustrine.

Phytolith Records in Vermicular Red earth:Implications for Bioclimatic Variationsduring Pleistocene

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Journal of china University of geosciences 2001年第1期12卷 27-30页

作者： Gu Yansheng Zhuo Ying Zhang Zejun faculty of earth {2.,{3. University of geosciences, wuhan 43.074 faculty of earth {2. China University of Geosciences

Phytolith analysis is employed in bioclimatic research into vermicular red earth, especially into its form, assemblage and zonation. The phytolith assemblage is divided into 10 zones. The statistics and main factor analysis of phytolith show that the obtained main factor load curves could suggest a climate change. Combined with phytolith assemblage feature, the bioclimatic variation of vermicular red earth during its formation stage, consisting of 5 arid-cold stages, 4 warm-humid stages and 2.mild stages, is reconstructed in detail. The research results indicate that phytolith records are ideal paleoclimatic signals in vermicular red earth, and that abundant information on environmental evolution can be located.

关键词： phytolith records vermicular red earth bioclimatic variation.

Problems of Sequence Stratigraphy in china

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Journal of earth Science 2000年第3期19卷 10-20页

作者： Wang Hongzhen faculty of earth {2. and Mineral Resources,{3. University of geosciences, Beijing 100083.{3.

A comprehensive study of outcrop sequence stratigraphy in china began in the early 1990s. The investigated strata range from Mesoproterozoic to Quaternary and the studied areas cover the three platforms and margins, the Southern Himalayas and the East china and South china seas. Problems of general concern in the sequence stratigraphy of china are discussed. These are: the hierarchy for sequence stratigraphy, the third order Sequence and eustasy, the chronostratigraphic boundaries and GSSP, and the International Stratigraphic Chart and the sequence chronostratigraphy of china. The average time interval of Mesosequence (2.-40 Ma) and of the Sequence (2.5 Ma) is suggested and the minor sequences below the Sequence are discussed. The time interval of the Sequence shows no evident decrease with time, but several epochs with remarkable short intervals occur in the Phanerozoic, which may represent a planetary behavior denoting the special development stages in earth’s evolution. Sea level change curves are given separately for the three platforms and the different regions. The Global Stratotype Section and Point (GSSP) concept and practice are discussed, and a comparison between the first appearance point of biozone and the first flooding surface in the Sequence is made for designation of the chronostratigraphic boundary. It is suggested that the chronostratigraphic boundaries might be set at the first flooding surface in the Sequence for easy recognition. The idea of sequence chronostratigraphy is recommended, and a comparison between the International Stratigraphic Chart and the sequence chronostratigraphy of china is made. The close relation between chronostratigraphy and sequence stratigraphy makes it possible for sequence stratigraphy to improve chronostratigraphic research. It is pointed out that multidisciplinary study in chronostratigraphy is necessary and should be promising and profitable.

关键词： sequence stratigraphy chronostratigraphy GSSP china.

Paleoenvironmental records from the northern South china Sea since the Last Glacial Maximum

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Acta Oceanologica Sinica 2010年第3期29卷 46-62页

作者： GE Qian CHU Fengyou XUE Zuo LIU J Paul DU Yuansheng FANG Yinxia faculty of earth {2. China University of Geosciences Wuhan 430074 China Key Laboratory of Submarine geosciences State Ocean Administration Hangzhou 310012 China Department of Marine Earth and Atmospheric Sciences North Carolina State University Raleigh NC 27695 USA

Core ZHS-176 contains the paleoenvironmental records from the northern South china Sea （NSCS） since the Last Glacial Maximum （LGM）. A coupled approach based on clay mineral assemblages, planktonic foraminiferal oxygen and carbon isotopes, and calcium carbonate content is used to trace the sources of the fine-grained sediment and to investigate the paleoenviornmental evolution in this area. Clay mineral assemblages are dominated by illite （average about 3.%） and chlorite （about 2.%）, which comes mainly from Taiwan and the East china Sea. Kaolinite, which accounts for about 13., comes mainly from the Zhujiang （Pearl） River, and Luzon Island is the main source for smectite （about 2.%）. The planktonic foraminiferal oxygen isotopic oscillations during the last glacial period are coeval with climate variations recorded in the Greenland ice core and Western Pacific sediment. These variations include the LGM, Heinrich event 1, Bφlling-Allerφd （B/A）, and Younger Dryas. For the Holocene, three periods of strong precipitation （S1-S3. and three periods of weak precipitation （W1-W3. are identified. The oxygen isotopic record exhibits corre-lation with climate records from distant regions, including the high-latitude Northern Hemisphere, providing evidence for global tele-connection among regional climate. A brief, negative planktonic foraminiferal carbon isotopic excursion during B/A reflects increased methane released from marine gas hydrate due to the rapid warming of the water. By comparing calcium carbonate content curves of the core ZHS-176 with these of other five boreholes lying above the lysocline, a remarkable low calcium carbonate event is found during the early Holocene in NSCS.

关键词： clay mineral oxygen and carbon isotopes calcium carbonate content South china Sea paleoenvironmental evolution

Discovery of Jinning Cycle Magmatism in Eastern Part of Eastern Kunlun Orogenic Belt and Its Significance

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Journal of earth Science 2000年第3期19卷 134-139页

作者： Zhu Yunhai faculty of earth {2.,{3. University of geosciences, wuhan 43.074,{3. Pan Yuanming Department of Geological {2., University of Saskatchewan, Saskatoon, Canada Zhang Kexin faculty of earth {2.,{3. University of G

From the isotopic dating study of gneissic granodiorite, the authors discovered magmatism of the Jinning cycle. Intrusive rocks were formed in the Neoproterozoic, whose Pb Pb ages range from (913.4) Ma to (1 011±4) Ma and U Pb concordia age is (703.15) Ma. The tectonic settings of the rocks are volcanic arc or syn collision. After the formation of the intrusive rocks, these rocks also experienced reconstruction of Caledonian metamorphism. Based on the Ar Ar dating of metamorphic mineral of muscovite, the metamorphic time is determined to range from (3.6.8±0.8) Ma to (3.9.44±3.70) Ma.

关键词： Jinning cycle magmatism Eastern Kunlun orogenic belt Qinghai Province.

Extensional Tectonic Framework of Post High and Ultrahigh Pressure Metamorphism in Dabieshan,china

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Journal of earth Science 1998年第1期17卷 3-7页

作者： Zhong Zengqiu Suo Shutian You Zhendong faculty of earth {2.,{3. University of geosciences, wuhan 43.074

The most prominent feature of the extensional tectonic framework of post high pressure (HP) and ultrahigh pressure (UHP) metamorphism in Dabieshan is the development of the multi layered extension detachment zones surrounding the core of the Luotian dome, and the separation of the UHP, HP and epidote blueschist units by the detachment zones, which form the vertically stacking sheet like slices of the HP and UHP metamorphic rocks. From the core outwards, exist the HP and UHP rock barren Dabie complex, UHP unit, HP unit and epidote blueschist unit. The extension tectonics of post HP and UHP metamorphic event constrain the distribution and present configuration of the HP and UHP metamorphic rocks, and the extensional tectonic framework bears some similarities to the Cordillera metamorphic core complex. It is suggested that partial melting happened in the Dabie gneiss complex (DGC) and UHP unit contemporaneously with the extrusion of UHP metamorphic rocks into the lower-middle crust. The formation and emplacement of the migmatite and granites are the response to the change in thermal state, facilitating the transfer from the compressive regime to extensional regime in the crust. The large scale crustal extension and uplift and the accompanying anatexis in Dabieshan are probably related to the delamination and magmatic underplating in the mantle and the lower crust.

关键词： high and ultrahigh pressure metamorphic rocks post collision extension tectonics Dabieshan.