Based on the practice of oil and gas exploration in the Huizhou Sag of the Pearl River Mouth Basin,the geochemical indexes of source rocks were measured,the reservoir development morphology was restored,the rocks and ...Based on the practice of oil and gas exploration in the Huizhou Sag of the Pearl River Mouth Basin,the geochemical indexes of source rocks were measured,the reservoir development morphology was restored,the rocks and minerals were characterized microscopically,the measured trap sealing indexes were compared,the biomarker compounds of crude oil were extracted,the genesis of condensate gas was identified,and the reservoir-forming conditions were examined.On this basis,the Paleogene Enping Formation in the Huizhou 26 subsag was systematically analyzed for the potential of oil and gas resources,the development characteristics of large-scale high-quality conglomerate reservoirs,the trapping effectiveness of faults,the hydrocarbon migration and accumulation model,and the formation conditions and exploration targets of large-and medium-sized glutenite-rich oil and gas fields.The research results were obtained in four aspects.First,the Paleogene Wenchang Formation in the Huizhou 26 subsag develops extensive and thick high-quality source rocks of semi-deep to deep lacustrine subfacies,which have typical hydrocarbon expulsion characteristics of"great oil generation in the early stage and huge gas expulsion in the late stage",providing a sufficient material basis for hydrocarbon accumulation in the Enping Formation.Second,under the joint control of the steep slope zone and transition zone of the fault within the sag,the large-scale near-source glutenite reservoirs are highly heterogeneous,with the development scale dominated hierarchically by three factors(favorable facies zone,particle component,and microfracture).The(subaqueous)distributary channels near the fault system,with equal grains,a low mud content(<5%),and a high content of feldspar composition,are conducive to the development of sweet spot reservoirs.Third,the strike-slip pressurization trap covered by stable lake flooding mudstone is a necessary condition for oil and gas preservation,and the NE and nearly EW faults obliquely to the principal stress have the best control on traps.Fourth,the spatiotemporal configuration of high-quality source rocks,fault transport/sealing,and glutenite reservoirs controls the degree of hydrocarbon enrichment.From top to bottom,three hydrocarbon accumulation units,i.e.low-fill zone,transition zone,and high-fill zone,are recognized.The main area of the channel in the nearly pressurized source-connecting fault zone is favorable for large-scale hydrocarbon enrichment.The research results suggest a new direction for the exploration of large-scale glutenite-rich reservoirs in the Enping Formation of the Pearl River Mouth Basin,and present a major breakthrough in oil and gas exploration.展开更多
Southeast China coastal areas belong to subtropical monsoon climatic zone, thus easily affected by floods resulted from typhoons and rainstorms. Since the areas of river basins are small, rivers flood regulation capac...Southeast China coastal areas belong to subtropical monsoon climatic zone, thus easily affected by floods resulted from typhoons and rainstorms. Since the areas of river basins are small, rivers flood regulation capacities are low, and therefore flood hazard is grave. In this paper, taking the Yongjiang basin in southeast China as an example, the approaches and methods of geographic information system(GIS) applied to flood disaster control and reduction research on small basin are explored. On GIS help the rainfall runoff calculation model and the river channel flood routing model are developed. And the evaluating flood submerged area and the damage assessment models are built supported by digit elevation models. Lastly the decision support system on GIS supported for flood control in research basin has been set up. This greatly improves flood proofing decision making capacities in river basin, and provides valuable information and a mode for flood prevention and reduction in the medium and small basin. Meanwhile, the research indicates that technologies of GIS provide a powerful tool for flood disaster control.展开更多
Shanxi Zhuozhang River Basin has a long history of human habitation,which is one of important cradles of Central-Plains civilization.It has a distinctive valley landscape and holds the glorious Shangdang culture throu...Shanxi Zhuozhang River Basin has a long history of human habitation,which is one of important cradles of Central-Plains civilization.It has a distinctive valley landscape and holds the glorious Shangdang culture through the Fukou pathway of the ancient 8 valley pathways in Taihang,one of the main activities of Shanxi Lu Trader,and the old revolutionary base areas of Chinese Communist Party.Within the study area,the common factors infl uencing the ancient villages and towns space characteristics were systematically revealed from fi ve aspects of valley landscape environment,Lu Trader development lines,Buddhism propagation path,regional folklore and military activity site.By exploring the uniqueness and similarity,this study analyzed the spatial pattern of ancient villages and towns in the Zhuozhang River Basin and the infl uence of natural,social and historical factors.The feasibility of constructing cultural route in the Zhuozhang River Basin was demonstrated.展开更多
基金Supported by the CNOOC Major Technology Project During the 14th FIVE-YEAR PLAN PERIOD(KJGG2022-0403)CNOOC Major Technology Project(KJZH-2021-0003-00).
文摘Based on the practice of oil and gas exploration in the Huizhou Sag of the Pearl River Mouth Basin,the geochemical indexes of source rocks were measured,the reservoir development morphology was restored,the rocks and minerals were characterized microscopically,the measured trap sealing indexes were compared,the biomarker compounds of crude oil were extracted,the genesis of condensate gas was identified,and the reservoir-forming conditions were examined.On this basis,the Paleogene Enping Formation in the Huizhou 26 subsag was systematically analyzed for the potential of oil and gas resources,the development characteristics of large-scale high-quality conglomerate reservoirs,the trapping effectiveness of faults,the hydrocarbon migration and accumulation model,and the formation conditions and exploration targets of large-and medium-sized glutenite-rich oil and gas fields.The research results were obtained in four aspects.First,the Paleogene Wenchang Formation in the Huizhou 26 subsag develops extensive and thick high-quality source rocks of semi-deep to deep lacustrine subfacies,which have typical hydrocarbon expulsion characteristics of"great oil generation in the early stage and huge gas expulsion in the late stage",providing a sufficient material basis for hydrocarbon accumulation in the Enping Formation.Second,under the joint control of the steep slope zone and transition zone of the fault within the sag,the large-scale near-source glutenite reservoirs are highly heterogeneous,with the development scale dominated hierarchically by three factors(favorable facies zone,particle component,and microfracture).The(subaqueous)distributary channels near the fault system,with equal grains,a low mud content(<5%),and a high content of feldspar composition,are conducive to the development of sweet spot reservoirs.Third,the strike-slip pressurization trap covered by stable lake flooding mudstone is a necessary condition for oil and gas preservation,and the NE and nearly EW faults obliquely to the principal stress have the best control on traps.Fourth,the spatiotemporal configuration of high-quality source rocks,fault transport/sealing,and glutenite reservoirs controls the degree of hydrocarbon enrichment.From top to bottom,three hydrocarbon accumulation units,i.e.low-fill zone,transition zone,and high-fill zone,are recognized.The main area of the channel in the nearly pressurized source-connecting fault zone is favorable for large-scale hydrocarbon enrichment.The research results suggest a new direction for the exploration of large-scale glutenite-rich reservoirs in the Enping Formation of the Pearl River Mouth Basin,and present a major breakthrough in oil and gas exploration.
文摘Southeast China coastal areas belong to subtropical monsoon climatic zone, thus easily affected by floods resulted from typhoons and rainstorms. Since the areas of river basins are small, rivers flood regulation capacities are low, and therefore flood hazard is grave. In this paper, taking the Yongjiang basin in southeast China as an example, the approaches and methods of geographic information system(GIS) applied to flood disaster control and reduction research on small basin are explored. On GIS help the rainfall runoff calculation model and the river channel flood routing model are developed. And the evaluating flood submerged area and the damage assessment models are built supported by digit elevation models. Lastly the decision support system on GIS supported for flood control in research basin has been set up. This greatly improves flood proofing decision making capacities in river basin, and provides valuable information and a mode for flood prevention and reduction in the medium and small basin. Meanwhile, the research indicates that technologies of GIS provide a powerful tool for flood disaster control.
基金the National Natural Science Foundation of China(51808004).
文摘Shanxi Zhuozhang River Basin has a long history of human habitation,which is one of important cradles of Central-Plains civilization.It has a distinctive valley landscape and holds the glorious Shangdang culture through the Fukou pathway of the ancient 8 valley pathways in Taihang,one of the main activities of Shanxi Lu Trader,and the old revolutionary base areas of Chinese Communist Party.Within the study area,the common factors infl uencing the ancient villages and towns space characteristics were systematically revealed from fi ve aspects of valley landscape environment,Lu Trader development lines,Buddhism propagation path,regional folklore and military activity site.By exploring the uniqueness and similarity,this study analyzed the spatial pattern of ancient villages and towns in the Zhuozhang River Basin and the infl uence of natural,social and historical factors.The feasibility of constructing cultural route in the Zhuozhang River Basin was demonstrated.
文摘数值气象预报与水文模型相结合能有效延长洪水预报的预见期,对中小流域山洪预警具有重要意义。为了研究高分辨率数值气象预报模式在中小流域洪水预报中的应用潜力,以福建省桃溪流域为研究对象,评估了数值气象预报模式GRAPES-RAFS(Rapid Analysis and Forecast System)在不同起报时刻的短期降雨预报能力,采用两种偏差校正方法(线性放缩法(LS)和分位数匹配法(QM))对降雨预报数据进行偏差校正处理,并分别用校正前和校正后的数据驱动新安江模型,评估预报降水在场次洪水预报中的适用性。评估结果表明,GRAPES-RAFS中小流域降雨过程具有较好的预报能力,但高估了降雨量,所有评价指标具有较好的一致性;采用两种偏差校正方法均能显著降低降雨预报的偏差,12场降雨的平均相对偏差从60.33%分别降低至18.00%(LS方法)和21.33%(QM方法);未经校正的GRAPES-RAFS预报降雨直接用于洪水预报的效果表现不佳,洪峰被明显高估,但降雨偏差校正能显著提升洪水预报的精度。总体而言,偏差校正后表现较好的降雨场次对应表现较好的洪水场次,且两种偏差校正方法表现相近。
