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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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    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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    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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    Liu Weixin, Wang Yanbin, Zhang Wentao, Yang Qi, Zhang Qinzeng
    Petroleum Geology & Experiment    2008, 30 (6): 557-563.   DOI: 10.11781/sysydz200806557
    Abstract   PDF (3608KB)  
    Based on analysis of petrology,diagenesis,pore structure,microfracture and relationship with the gas yield of the Upper Palaeozonic reservoir sandstones in Daniudi Gas Field,Northern Ordos Basin,fine diagenetic difference exists on Upper Palaeozoic potential reservoir.The compaction is the main diagenesis resulting in pore and permeability lost,cementation greatly changes the pore structure and further reduces porosity and permeability although dissolution may improves the reservoir quality to some extent.The cementation type and strength exhibit difference with stronger quart and relatively less carbonates cementation in Carboniferous Taiyuan Formation(C1t),and with less quart and relatively stronger carbonates cementation in Lower Shihezhi Formation(P1x).Pore structure analysis shows that the Third and Second Member of Lower Shihezhi Formation(P1x3 and P1x2) with larger permeability than P1x1 and other reservoirs is related with the microfractures contributing to higher production capacity in P1x3 and P1x2.
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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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    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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    Zhao Xianzheng, Jin Qiang, Zhang Liang, Liang Hongbin, Jin Fengming
    Petroleum Geology & Experiment    2010, 32 (5): 459-464.   DOI: 10.11781/sysydz201005459
    Abstract   PDF (1325KB)  
    Suqiao—Wenan is the first area in the Bohai Bay Basin where coal-derived hydrocarbon of the Carboniferous—Permian is found.New discoveries have been made till now.In order to clarify accumulation rules of hydrocarbon from the Carboniferous—Permian in the research area,analyses of accumulation background such as secondary hydrocarbon generation of coal source rocks have been made.3 accumulation models have been concluded: 1)self-generation and self-accumulation model of the Carboniferous—Permian;2)Pz2 generation and Pz1 accumulation model in buried hills;3)Pz2 generation and Paleogene accumulation model.Oil generation window in 3 500—5 000 m interval of the Carboniferous—Permian is the key factor for the 1st model.The Ordovician buried hills contacting with the Carboniferous—Permian source kitchen by faults over 300 m wide are the key factors for the 2nd model.Active faults communicating reservoirs with source kitchen control the 3rd model.3 favorable zones are pointed out for further 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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    Infra-red emission spectroscopy study of thermal evolution of organic matter bound by clay minerals in muddy hydrocarbon source rocks
    Lu Longfei, Cai Jingong, Liu Wenhui, Tenger, Hu Wenxuan
    Petroleum Geology & Experiment    2012, 34 (2): 215-222.   DOI: 10.11781/sysydz201202215
    Abstract   PDF (903KB)  
    To examine the thermal evolution of and the influence of organo-clay interaction on organic matter bound by clay minerals in muddy source rocks,we studied the <2μm particle-size fractions extracted from hydrocarbon source rocks in Neocene,Jiyang Depression,eastern China,using infra-red emission spectroscopy(IES).Results show that the vibration peaks of methylene and methyl representing aliphatic chain decrease with the increasing of temperature,and lateral chains are easily to subject to oxidation than main chains.Intensities of vibration peaks attributed to aromatic compounds vary respectively,some peaks such as 798,779 and 750cm-1 decrease with the increasing of temperature,but the reverse to other peaks.Vibration peaks such as 1 600 and 3 030cm-1 do not occur until 250℃ and increase first and decrease subsequently,while aromaticity factor increases progressively,showing a clear aromatization process.Also,carboxylic acids interact with interlayer hydrated actions of clay minerals through hydrogen bond,making carboxylic acids much stabile and thus suppressing their thermal evolution.IES study reveals that organic matter bound by clay minerals generates hydrocarbon mainly through aromatization of aliphatic compound,which is a quite useful method for source rocks thermal evolution study.
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    Quantitative description of high-capacity channels in Gaotaizi Reservior of Honggang Oil Field
    Niu Shizhong, Hu Wangshui, Xiong Ping, Wang Wei, Cheng Qun
    Petroleum Geology & Experiment    2012, 34 (2): 202-206.   DOI: 10.11781/sysydz201202202
    Abstract   PDF (1755KB)  
    In sandstone reservoirs which were during the medium and high water cut stages,high-capacity channels might take place after long terms of water flooding,which made the circulation of water flooding very inefficient,and further reduced exploration efficiency and recovery rate.A case study was carried out in the Gaotaizi Reservoir of the Honggang Oil Field.The influencing factors for the generation of high-capacity channels were studied.Porosity,permeability and water content ratio were chosen as static or dynamic indexes to calculate high-capacity channel parameter by confirming the weight of each index.Based on the above-mentioned modeling indexes,a three-dimensional model for high-capacity channels in the study area was set up so as to illustrate the generation and distribution of high-capacity channels in reservoir and to provide geologic basis for future oilfield development.This new method provided direction for the research on large pores,and was significant for the study of other similar reservoirs.
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