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    Characteristics and deformation mechanism of staging differential fault activities in Bachu Uplift, Tarim Basin
    Yang Yong, Tang Liangjie, Jiang Huashan, Chen Gang, Xie Daqing, Li Meng, Cao Zicheng
    Petroleum Geology & Experiment    2014, 36 (3): 275-284.   DOI: 10.11781/sysydz201403275
    Abstract   PDF (11613KB)  
    Based on the interpretation and analysis of the typical seismic profiles, we determined the activity phases of the faults in the Bachu uplift by calculating the amounts and rates of shortening of regional geological sections, and discussed the characteristics and deformation mechanism of staging differential activity. Fault activities took place mainly during the middle Caledonian, early Hercynian, late Hercynian, early Himalayan, middle Himalayan and late Himalayan. They were controlled by regional tectonic setting, pre-existing basement faults, regional detachment layer and some other factors. Compressive stress which generated by the closure of oceanic basin and the collision of plates was the dynamic source of the fault activities. The pre-existing basement faults controlled the position and orientation of the later stage faults. The regional detachment layer controlled fault development and distribution horizons.
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    Studies of 3D reservoir modeling: taking Ordovician carbonate fractured-vuggy reservoirs in Tahe Oil Field as an example
    Lu Xinbian, Zhao Min, Hu Xiangyang, Jin Yizhi
    Petroleum Geology & Experiment    2012, 34 (2): 193-198.   DOI: 10.11781/sysydz201202193
    Abstract   PDF (3018KB)  
    Carbonate fractured-vuggy reservoirs are basically different from clastic or other fracture-pore reservoirs.Karst caves,fractures and corroded pores coexist in the carbonate fractured-vuggy reservoirs and challenge traditional clastic reservoir modeling theories and methods.A new modeling technique based on fractured-vuggy unit has been proposed.It is featured by "5 steps" including the establishments of 5 models: cave distribution,fracture discrete distribution,cave petrophysical parameter,fracture parameter as well as fracture and cave connection.The model illustrates the 3D distribution and features of fractured-vuggy reservoirs and provides theore-tical basement for reservoir exploration.
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    Petroleum geology and exploration potential of Volga-Ural Basin:one typical foreland
    Li Bin, Zhu Xiaomin
    Petroleum Geology & Experiment    2012, 34 (1): 47-52.   DOI: 10.11781/sysydz201201047
    Abstract   PDF (1067KB)  
    The Volga-Ural Basin is a typical foreland basin in the eastern margin of the Eastern Europe Platform.Subsidence continued from Riphean of pre-Cambrian to Quaternary of Cenozoic.Good assemblages of source rock,reservoir and seal exist in the marine facies carbonate rocks of the middle and upper Paleozoic,resulting in giant petroliferous region which has great potential for petroleum exploration.The tectonic evolution of the basin can be divided into four stages including:1) clastic rock in intracontinental rift;2) carbonate tableland in passive margin;3) foreland basin of orogenic belt;4) clastic rock in foreland basin.Studies show that the basin has underwent a complete"Wilson Circle"from continent rift to continent collision,and is regarded as a typical giant foreland basin.Biological carbonate rocks generated during the passive margin stage contributed to hydrocarbon generation.Severe regional tectonic movements of orogenic belt when foreland basin formed provided driving force for petroleum migration and accumulation.Folds in the east of the basin are targets for future exploration.
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    Application of seismic sedimentology in platform edge reef, Songnan 3D area, Qiongdongnan Basin
    Huang Hongguang, Lu Yongchao, Zou Zhuochao
    Petroleum Geology & Experiment    2012, 34 (1): 25-29.   DOI: 10.11781/sysydz201201025
    Abstract   PDF (2212KB)  
    In Songnan 3D area in the northern margin of the southern uplift of the Qiongdongnan Basin,seismic sedimentology has been applied in the studies of platform edge reef based on recent 3D seismic data with high resolution.The style of active generation unit of reef is controlled by the fluctuation of sea level,and based on which a reef generation model has been established.Seismic attribute has been applied to describe the distribution of sedimentary microfacies of platform edge reef.Combined with reservoir porosity inversion restricted by velocity model,the physical property of reservoir can be predicted.Platform edge reef growing in the study area is characterized by complex border.Amplitude features among different layers reveal the spatial distribution of growth unit of platform edge reef in small and equal period.Abnormal low velocity zones in porosity study are potential targets for exploration.This research may provide new ways for reef-hydrocarbon reservoir exploration in the Qiongdongnan Basin.
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    Petroleum Geology & Experiment    2012, 34 (3): 0-0.  
    Abstract   PDF (285KB)  
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    Evaluation and prediction of shale gas sweet spots:a case study in Jurassic of Jiannan area Sichuan Basin
    Zhou Dehua, Jiao Fangzheng
    Petroleum Geology & Experiment    2012, 34 (2): 109-114.   DOI: 10.11781/sysydz201202109
    Abstract   PDF (2022KB)  
    The evaluation system,critical steps and key parameters for shale gas sweet spots were discussed in this paper.A case study was carried out in Jurassic of Jiannan area of the Sichuan Basin.By means of the evaluation system,the geologic features of sweet spots in shale gas reservoirs were analyzed,the distribution pattern of sweet spots were predicted,and the arrangement of exploration wells were put forward,resulting in good effects.It was concluded as followed.1) Different from conventional petroleum evaluation,the evaluation and exploration of unconventional shale gas demanded an unconventional approach combining geology with engineering.Geology,geochemistry,petroleum engineering,lithomechanics and petrophysics all contributed to the evaluation.2) The success of long-distance horizontal fracturing in well Jianye HF-1 proved good potential for shale gas exploration in Jurassic of Jiannan area.3) The maps of shale thickness,ω(TOC),Ro and burial depth might guide shale gas sweet spots exploration.
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    Favorable exploration targets in northern Avat and northern Shuntuoguole areas, Tarim Basin
    Lü Haitao, Geng Feng, Mao Qingyan, Wu Qiqiao, He Kai
    Petroleum Geology & Experiment    2012, 34 (1): 8-13.   DOI: 10.11781/sysydz201201008
    Abstract   PDF (1104KB)  
    In the past years,few achievements in accordance with the scale of hydrocarbon generation depression have been obtained in petroleum explorations in Avat area of the Tarim Basin and the favorable exploration targets still remain exploring.Based on new exploration data and research progresses,it is discussed in this paper the petroleum geologic conditions in the northern Avat and the northern Shuntuoguole areas.Three petroleum systems have been identified according to petroleum system theory.As to the Cambrian-Ordovician petroleum system(!) in Avat area,the most favorable exploration target is the middle-lower Ordovician karst-vuggy carbonate reservoir in the east of the study area.The traps formed in or before Yanshan period along big faults are less favorable.For the Triassic-Jurassic petroleum system(!) in Kuche area,the most favorable exploration targets include Paleogene-Cretaceous lithologic traps and various traps of unconformity fluctuation of early Himalayan epoch in the east of the area.Delta sandbody and lacustrine turbidite mass are favorable targets in the Triassic petroleum system(?) in Avat area.
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    Fold structure pattern in southwestern Qaidam Basin
    Li Lanbin, Sun Jiazhen, Xia Xiaoyan, Jiang Wuming, Wu Guangda
    Petroleum Geology & Experiment    2012, 34 (1): 30-35.   DOI: 10.11781/sysydz201201030
    Abstract   PDF (10318KB)  
    Based on the studies of tectonic profile and deformation history,the structures in the southwestern Qaidam Basin have been divided into 5 categories according to their genetic mechanisms: thrust fold structure,fault-propagation fold structure,detachment fold structure,diapiric structure(mud diapir structure) and composite fold structure.The thrust fold structure distributes in the Kunbei fault-uprising belt,mainly characterized by the involving of basement into severely-uprising unilaterally extruding asymmetrical fold.The fault-propagation fold structure locates in the Gasi-Zhahaquan fault-fold belt,mainly characterized by the involving of basement into unilaterally extruding fault-propagation asymmetrical fold.The detachment fold structure locates in the Yingxiongling detachment fold belt and the central depression as well as the shallow layer of the Gasi-Zhahaquan fault-fold belt,mainly characterized by detachment fold which is approximately symmetrical in middle-shallow layer.The diapiric structure(mud diapir structure) is characterized by the upwarp of plastic mudstone and usually distributes in the east of the central depression and the Yingxiongling detachment fold belt.The composite fold structure is composed of the trust-propagation and the detachment fold structures.
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    Hydrocarbon carrier system of carbonate rock and exploration direction in Tahe Oilfield, Tarim Basin
    Wang Xiang, Lü Xiuxiang, Liu Guoyong, Zhang Yanping, Jiao Weiwei, Hua Xiaoli
    Petroleum Geology & Experiment    2012, 34 (1): 14-18.   DOI: 10.11781/sysydz201201014
    Abstract   PDF (1716KB)  
    The hydrocarbon carrier system of carbonate rock in the Tahe Oil Field has been studied systematically according to regional geologic condition.The above-mentioned carrier system can be divided into three types: 1)fault structural fissure;2)unconformity and paleo-weathering crust;3)Ordovician karst pore,fracture and vug.Fault and its concomitant structural fissure as well as karst fracture network resulted from severe karstification effect work as hydrocarbon carrier system in the central Tarim Oil Field.Fault and its concomitant structural fissure as well as unconformity dipping to the south chronically work as hydrocarbon carrier system in the peripheral region of the oil field.According to the features of hydrocarbon carrier elements and their spatial arrangement,three favorable exploration targets have been pointed out: 1)fracture-karst type reserves in the north of block no.3 of the Tahe Oil Field;2)stratigraphic unconformity-karst type reserves in the central Tahe Oil Field;3)lower Ordovician karst-fracture type reservoirs in the southern Tahe Oil Field.
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    Current status and progress in research of hydrocarbon cap rocks
    Zhou Yan, Jin Zhijun, Zhu Dongya, Yuan Yusong, Li Shuangjian
    Petroleum Geology & Experiment    2012, 34 (3): 234-245.   DOI: 10.11781/sysydz201203234
    Abstract   PDF (1758KB)  
    It was reviewed in this paper the history and current status of the research of hydrocarbon cap rocks. The research progress in both mud and evaporite cap rocks was summarized, and the current research status of dynamic sealing mechanism was analyzed. There are 5 stages in the research development of cap rocks, and the focus of research has shifted from rock physics to deformation process and sealing effectiveness during hydrocarbon accumulation, such as study in high quality seals, mechanical properties of cap rocks, matching between sealing capacity and accumulation conditions, and so on. Extensive literature review suggests that evaporites are very important hydrocarbon seals all over the world and karstification in later stages would affect the sealing capacity; sedimentary texture, structure, and composition (especially clay content) of the mud rocks show fairly important influencees on sealing capacity of mud rock seals; deeply buried mud rocks which have been through high diagenetic evolution still show excellent sealing capacity. Capillary physical sealing, overpressure sealing, capillary multiphase sealing and several other types of sealing mechanism have been discovered and studied, but the capillary physical sealing is the most fundamental sealing mechanism. Counties that are active in cap rock research include the United States of America, Norway, Austrialia, Britain, Italy, Germany, and so on. Institutions involved are mainly colleges and universities, goverment institutions, and petroleum companies.
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