第39卷 第4期 2006年 (4)
2007-04-12 17:39:37 作者： admin 来源： 浏览次数： 902 文字大小：【 大】【 中】【 小】 ??
Discrimination of OIB Volcanic Rocks of Bikou Group and Their Tectonic Implication
LI Yong-fei1, LAI Shao-cong2?
(1.Shenyang Institute of Geology and Mineral Resources, C.G. S., Shenyang
110032,China;2.Department of Geology, Northwest University,Xi’an 710069, China)?
Abstract：Geochemical analysis of the volcanic rocks of the Bikou group from the southern
Tongqianban.Tuohe region reveals that they are of the alkaline basalts and sub alkaline tholeiitic basalts, which have an affinity to the typical ocean island basalts (OIB) in the contents of Nb, Ta, Ce and the Ba/Ce, Ti/Y and Zr/Y ratios. In addition, the N-MORB-normalized spider diagram and the Chondrite normalized REE pattern show that the two kinds of rocks were gene rated from the same parental magmatic source. The tectonic discrimination diagrams of the 2Nb-Zr/4-Y, TiO2-MnO-P2O5, Ti/Y-Ba/Zr and Ti/Y-Ba/Nb have fairly signified that the rocks occurred in an intraoceanic tectonic setting, which would be a critical evidence to confirm a n oceanic basin developed in the study region in the Neoproterozioc time. ?
Key words：OIB volcanic rocks; geochemistry; Bikou group
Discovery of Jurassic Strata in Luobubo area, Xinjiang and Its GeologicalSignificance
YANG Rui-dong1, LUO Xing-rong2, ZHANG Chuan-lin3, WANG Bai-xun4, ?TIAN Jing-quan2，WEI Huai-rui1, WANG Wei1?
(1. Guizhou University, Guiyang 550025, Guizhou, China;2.Geological Team No.3 of Xinjiang Geological Bureau, Korla, 980001, China;3.Institute of Nanjing Geology and Mineral Resources, Nanjing 210016, China;4.Geological Team No.4 of Jilin Geological Bureau, Siping 136000,China)?
Abstract： The Jurassic strata were discovered in the Luobubo area, Xinjiang. The strata are comprised of mudstones, siltstones, sandstones, conglomerates and interbedded coal beds. Abundant and well preserved silicified wood (Coniferae.sp., Cupressinoxycon.sp.) was found in the Qiakemake formation mudstones and siltstones of upper Jurassic seccssion, an d two coal beds (0.3m and 0.4m thick) occur in the Sukang (Qiakemake) formation.The Jurassic strata has been the first time found in the northestern Aman Depression of the Tarim basin.Therefore, this discovery is significancant for Jurassic stratigraphical study and oil and gas d evelopment in the Tarim basin.?
Key words：silicified wood; coal bed; Jurassic statra; Luobubo area; Xinjiang
Research on The Stalagmites Sedimentary Chronology?
——A Case Study on No.1 Stalagmite of Shuinan Cave in Guilin, China
LIN Yu-shi1, YUAN Dao-xian1, CHENG Hai2, ZHA NG Mei-liang1,?
YANG Yan1, LIU Yu1, QIN Jia-ming1, LI Bin3?
(1. Karst Dynamics Laboratory, Institute of Karst Geology, CAGS, Guili n 541004，China；?2.Geography Department, Minnesota University, MN 55455, USA；3.Bureau of Land and Resources of Guangxi, LRM, Nanning, 530023,China)
Abstract：The stalagmite P1, P2 of Panlon g cave and stalagmite X1 of Xiangshui cave in Guilin( which their ages are 30 ka BP , over 350 ka BP and 56ka BP, respectively), the stalagmite D3,D4 of Dongge cave and stalagmite Y1 of Yaman cave in Libo( which their ages are from 6 4 ka BP to 19ka BP , over 155 ka BP and from 53ka BP from 7.3 ka BP, spective ly), the stalagmite Q14,Q16 of Qixing cave in Duyun( which their ages are from 64 ka BP to 19ka BP , over 155 ka BP and from 53ka BP from 7.3 ka BP, spectively),Guizhou, and the stalagmite LL1,LL5 of Linhua cave in longshan( which their ages are from 60 ka BP to 21a BP , and from 80ka BP from 6 ka BP, respectively),Hunan, have been studied and integrated for many years.The characteristics of depositional cycles, micro?lamina and bedding plane structure in large stalagmites with height from 150cm to 400cm have obviously typicalness and repre sentativeness.The dating precision low of the present Quaternary chronological scale will prog ressively be replaced on the basis of macroscopic and microscopic deposit charac teristics and systematic dating ages from stalagmites in caves.Author has established the chronological scale from 150ka to 250ka BP in Guilin areas on the basis of 11 depositional cycles from N0.1 stalagmite of Shuinan cave and relati ve deposit characteristics and using of high precisional TIMS-U series dating? We suggest that the division boundary of chronology between the late Pleistocene and the middle Pleistocene i s ca 200ka BP as the bottom boundary of Quaternary chronology is over 2500 ka.The boundary of c hronology locates at third depositional hiatuse from N0.1 stalagmite of Shuinan cave, which formed 3mm weathering crust and has a markedness difference at the upper and lower material texture and structure.The carbon and oxygen isotope from the cold deposit sta lagmites in 11 depositional cycles are a heavy or positivetrend and the maximum value point is an abrupt point of transferring cold or depositional hiatus surface.The duration of 11 depositional hiatuses h as obvious difference, in which the duration of third and ninth depositional hiatuses is 20ka, 2ka, res pectively.The information of the synthetically geology and climate is a good correlation and p ossible evident of reconstructing paleoclimate and environment.??
Key words： Stalagmite； deposit characters； chronology； Guilin??
Genesis and Characteristics of Copper Deposits in ?
Fenghuoshan Mountains
LIU Zhi-yong1,ZHANG Kai-cheng1,SONG Zhong-bao2,LIU Shu-ying3
(1.Qinghai Geological Survey Institute,Xining,810012,China; 2.Xi’an Institute of Geology and Mineral Resources, Xi’an,710054,China;?3.Qinghai Hydrogeology and Engineering Geology Exploration Institute, Xining, 810008,China)?
Abstract：Copper deposits of the Fenghuoshan area geologically occur in the west ern portion of the Sanjiang nonferrous and noble metal mineralizatin belt, which is well known in China. The previous backward work hinders the study of the mineralization settings and genesis of the deposits. Recently, as geological survey and mineral resource exploration are c arried out, some general geological information has become clear. As a result, edimentary circ umstances of the Fenghuoshan group, its sequences and the ore-bearing strata as well as the deformation sequences have been determined. Based on field work, we have analyzed the charac teristics and genesis of the copper deposits. It is suggested that the enghuoshan copper de posits are hosted by sandstones, the ore bodies usually appear in grey and thick to intermediate t hick , fine grained quartz lithic sandstones intercalating with thin bonaceous mudstones. ?
Key words： Fenghuoshan group; ore deposit geology; genesis; sandstone type copper deposit
Geological Characteristics and Metallogenic Model of Ershiyizhan Gold and Copper Deposits in Heilongjiang Province
ZHAO Guang-jiang1、2，HOU Yu-shu1、2，YANG Ji-quan2?
（1.China University of Geosciences,Beijing 10083,China ; 2.Qiqihaer Exploration Institute ofGeology and Mineral Resources，Qiqihaer 161006,China）?
Abstract：The gold and copper orebodies of the Ershiyizhan deposits are different in terms of their spatial distribution. The gold bodies, in a northwestern extension, are located in the southwestern contact of the intrusive, while the copper orebo diesare centered inside the ntrusive and stretch northeast..Based on the geological features of the Ershiyizhan gold opper deposits,this paper studies the controls factors and proposes a metallogenic model for the deposits: the gold and copper deposits belong to different products of different genesis type and metallogenic periods. The mineralization related intrusive was emplaced in three times after magmatic differentiation of the crust?mantle mixed magmas. ?
Key words： gold and copper deposits of the Ershiyizhan area; geolo gical features; metallogenic model; Heilongjiang
Coal Resources and Development Potential in
Northwest China
CHEN Shou-jian1，WANG Yong2，WU Yue-zhong1,?
WANG Zhan3， ZHANG Wei-ji4?
(1.Xian Institute of Geology and Mineral Resources，Xian 710054,China； 2.Aerophotogrammetry and Remote Sensing Bureau of China Coal Geology, Xian 710054,China； 3. Northwest University，Xian 710069,China；4. Changan University of，Xian 710054,China)?
Abstract： Nowthwest China has rich coal resources,which are accounted for 76.46 percent of the total forecast coal reserves in the nation. The major coal basins are the Ordos , the Junggar, the Tyrpan-Hami and the northern Tarim basins. Of the basins, the Ordos basin has a stable cratonic basement on which the Carboniferous.Permian north China type marine continental facies and also Triassic-Jurassic intracontinent lacustrine caol-bearing strata were dep osited. The Junggar, Tyrpan-Hami and Northern Tarim basins belong to the Jurassic intracontinental lacustrine coal basins with the stable continental basement. The Ili, Youledusi,Yanqi and Kumish i basins are intermountane fault basins on the basement of the Hercynian fold zone.The base ment of the Hexizoulang basin groups is the Caledonian fold zone. Alsly and Qaidam massifs covered by desert have laeogeographic conditions for coal accumulation during the Paleozoic and Mesozoic. In fact, some small coal basin groups have been found on the southern margin of the two massifs. According to the survey of National Bureau of Coal Industry in 1998，the ret ainable reserves of coal resources in northwest China was about 4 035.35×108t, of which, 752 .24×108 t retainable reserves are in production or would be production, proven reserves o f 187.69×108t，robable reserves of 510.51×108 t for further exploration, inferred reserves of 2 550.91×108t Coal consumption reached 13.69×108t in 2002, 17.36×108t in 2003, 19×108t i n 2004 in the country.But, the coal output in Northwest accounts for a small portion of the national output. According to the data of National Association of Coal Industry in Jan.2004,the national total coal output was 11 170.75×104 t, while Northwest area was only 1 585.17×104 t, making up only 14.19 percent. On all accounts, development potential of coal resources is huge in Northwest China. As national economy remains strong growth, it is more important to promote basic research an d exploration work on coal resources in order to accelerate coal exploitation.?
Key words： northwest China; coal resources; coal reserves; coal output; coal potential
Formation and Exploration Target of Oil Shale in Northwest China
LU Jin-cai, LI Yu-hong, WEI Xian-yang, JIANG Ting?
(Xi′an Institute of Geology and Mineral Resources, Xi′an 710054,China)?
Abstract：Northwest China is one of the most abundant areas in oil shale in the nation, where oil shale is widely distributed in a number of large sedimentary basins such as the Ordos, Zhungerer, Tarim, Qaidam and Ejina-Yingen, and also some medium-small size basins such as the continental facies intermontane basins in the Daqingshan and Yinshan areas as well as in the Qilian-Hexi Corridor (west to the Dunhuang basin, east to the upanshan basin.Bayanhot bas in, south to the Qaidam basin, including many Meso-Cenozoic sedimentary basins with Paleozoic ba sement). By analysis of formation conditions and genetic type of different sedimentary basi ns in northwest China, The author proposed three genetic types of oil shale: deep lacustrine?mo derate lacustrine facies, marine continetal interactive facies and swamp facies. It is suggeste d that the deep trine moderate lacustrine facies of large inland basin is the most favora ble exploration
targetbecause of its steady sedimentary environment, abundant organic matterand other characteristics such as wide distribution ,great thickness and steady oil conten t which made oil shale deposit much easier.?
Key words： northwest China; oil shale; genetic type; resource potential
Oil Pool Forming Effects of Neotectonic Movement ?
in Jiyang Depression
ZHUO Qin-gong1, 2?，JIANG You-lu1，XIE Yu-bao2?
(1. Faculty of Earth Resource and Message, University of Petroleum, Dongying 257061, China; 2. Geological Scientific Research Institute, SLOF, Dongying
257015, China)?
Abstract：Neotectonic movement in the Jiyang depression mainly formed faults and anticlines, especially,the large revived faults and its fractures. These structu res playa important role in the processes of oil and gas accumulation. Neotectonic movement induces and drives oil and gas out from hydrocarbon source rocks in form of faults system, which improves efficiency and power of expulsion and influencs orientation of oil and gas migration and controls northeast extension of main pools; conducts and envelops oil and gas, small faults and microcracks conduct oil and gas, form pool of sandstone lens in subdepression; Neotectonic movement controls hydrocarbon to cyclic accumulate; multiconductive systems linked large upper Tertiary drape anticlines and prolific source rocks and formed large and medium size fields like Gudao and Chengdong and so on. In this paper, above described effects derived from Neotectonic movement in the processes of reservoir forming is called oil pool-forming effect whose study can reevaluate petroleum resources of basin , and reveal mechanism, pattern and law of oil pool?forming.?
Key words： Neotectonic movement; tectonic stress field; fault system; oil Pool-forming effect; Jiyang depression
Conditions of Petroleum Generation of Bohu Depression in Yanqi Basin
YAO Ya-ming1，WＵ-ye1，LＩ Hong2，CHEN Jian-jun3，FU Dai-guo 4
（1.Zhengzhou Economic Management Institute, Zhengzhou 450052,China；2.Zhengzhou Institute of Geoengineering Prospectinf, Ministry of Chemical Industry, Zhengzhou, 450002,China；3.Department of Geology, Northwest University, Xian 710069, China； 4.Henan Petroleum Exploration Bureau, Nanyang 473132, China） ?
Abstract：The Yanqi basin is located in the east of South Tianshan orogenic belt . As a small Jurassic petroleum basin, the Yanqi basin, which is similar to the surrounding basins such as the Tarim,and the Tupan basins, has its owns peculiar characteris tics of petroleum geology. This study, based on the essential characteristics of genera tion, reservoir, cap rocks,and trap,focuses on the conditions of the petroleum formati on of Bohu depression. Through organic matter types, abundance and degree of thermal evolution, it shows that pelites of the lower Jurassic Badaowan group are main hydrocarbon source rocks. The reservoir has low porosity and permeability and drilling data indicate there are two suites of reservoir cover. Hydrocarbon gen eration history,authigenici llite chronological study and homogenization temperatures of fluid inclusions, show that there have two stages of petroleum generation and accumula tion.?
Key words：Yanqi basin;Bohu depression; petroleum condition; accu mulation phases; accumulation model
Diagenesis and Pore Evolution of Reservoir
in Luliang Oil Field
LI Jun-wen1 ,CHEN Hong-de1，2,WEI Qin-lian1?
( 1.Sedimentary Geology Institute， Chengdu University of Technology Chengdu，610059,?Sichuan，China；2.State Key Laboratory of Oil and Gas Reservoir Geology and
Exploitation, Chengdu 610059,Sichuan,China)?
Abstract： The study on the diagenesis course of Cretaceous and Jurassic reservoir in the Luliang oil field indicates that evolution of reservoir pores is closely related to comp action, solution and cementation. Compaction, quartz secondary enlargement and kaolinite an aphase infilling are main diageneses to damage pores. The solution of felspar and carbonate minerals are the chief diageneses to form sencondary pores. Space time configuration of various diagen eses controll the development of pores. Development of reservoir pores in vertical zoning formed a secondary pores belt. So, it is significant to forecast spatial istribution of the res ervoir physical properties.〗Key words： Luliang oil field; Jurassic; diagenesis; pore evolution
Sedimentary Facies of Reservoir and Exploration?
Target of Chang 6 Member of Yanchang Formation ?
in Xiasiwan Oilfield in Ordos Basin
SONG He-ping1，WANG Gui-cheng2，AN Xiao-ping1，?
(1. Yanchang Oilfield Corporation Extraction Factory of Xiasiwan,
Yanan 716000,China；2. Xian Petroleum University,Xian 710065,China)?
Abstract： Study on sedimentary facies and microfacies of the known reservoir of the Chang 6 member of the Yanchang formation in the Xiasiwan Oilfield indicates that the dominant reservoirs are distributary channels and river mouth bar microfaci es in the delta frontal surfaces of this region. Also,the accumulation of oil and gas is controlled by gentle structures. And find that source bed，reservoir and cap rocks are in a xcellent combination, providing conditions for large scale hydrocarbon accumulations. The exploration should be planned around the identif ied pool and then extended to both east and west in direction. ?
Key words： sedimentary facies;accumulation factor analysis; chang 6 member;
Yanchang formation;Xiasiwan oilfield
Characteristic and Evaluation of Chang 3 Member Reservoir of the Yanchang Formation in the Fuxian Area , North Shaanxi
WANG Yan1, HONG Yu2,WANG Yun-suo2,FU Guo-min3,?
WANG Sheng-quan1?
(1.Xian University of Science and Technology, Xian 710054,China;2.Exploration and Development Research Institute of Zhongyuan Petroleum Administration, Sinopec, Puyang 457001,China;3.Changan University, Xian 710054,China)?
Abstract： The oil-bearing Chang-3 member of the Yanchang Formation is one of t he major oil producing formations in the Fuxian area, north Shaanxi. Chang-3 member belongs to an environment of delta frontal subfacies. The primary types of the reservoirs include distributary channel sandbodies, river mouth bar sandbodies.The secondary types are front?mat sand and distal bars. Statistics and analysis for 80 simples indicate that mineral maturity of Chang-3 reservoir is low, and textural maturity is medium-low. Reservoir diagensis types are relatively comlex and mainly consist of compaction, cementation and dissolution in the A period of the late stage. Diagenesis evolution can be divided into three stages: compaction and cementati on to pore reduction, cementation, infilling and pore reduction and corrosion to pore enlargement. Petrophysical property analyses of 1747 simples from 18 wells show that the physical property of the Chang-3 member reservoir is of low porosity and very low permeable reservoir. Pore types are characterized by residual protozoal intergranular porosity and dissolution porosity. The reservoir is closely controlled by sedimentation and diagenesis. It is suggested that the Chang-3 reservoir can be divided into the high quality excellent, the intermediate quality and the low quality reservoirs. The physical property of the Chang32 reservoir is bettern that Chang31 and Chang 33.?
Key words： characteristic of reservoir; evaluation of reservoir; diagenesis; structure of pore
Situation and Prevention Measures of Geological ?
Hazards in Baoji Area
MA Zong-ke?
(Baoji Bureau of Land and Resources, Baoji 721000,China)
Abstract： Due to the complex geoenvironment and the increasingly unreasonable human activities, geological hazards have frequently occurred in the Baoji area . Thus, the area has become one of the areas with severe geological hazards in Shaanxi province. 784 sites of geological hazards have been found in the area, which cause governmental and public attention. The study analyzes the present situation, the distribution characteristics and the causes for the geological hazards in the area. Furthermore, the study points out some problems for the hazards prevention. Fin ally, some suggestions for the geological hazard prevention are given. All these would be meaningful for the prevention and cure of the geological hazards inthe aera.?
Key words： Baoji area; geological hazards; causes; prevention dmeasures
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