The buried hill in the Jizhong depression contains abundant petroleum reserves and are important production areas.The Ordovician buried hill has restricted the discovery of new oil and gas exploration targets because ...The buried hill in the Jizhong depression contains abundant petroleum reserves and are important production areas.The Ordovician buried hill has restricted the discovery of new oil and gas exploration targets because of its strong reservoir heterogeneity and complex reservoir-controlling factors.Based on a large volume of core,thin section,logging,seismic,and geochemical data and numerous geological analyses,the reservoir-forming conditions and modes were systematically analyzed to guide the exploration and achieve important breakthroughs in the Yangshuiwu and Wen an slope buried hills.The study revealed that three sets of source rocks of the third and fourth members of the Shahejie Formation from the Paleogene and Carboniferous-Permian were developed in the Jizhong depression,providing sufficient material basis for the formation of buried hill oil and gas reservoirs.The reservoir control mechanism involving the three major factors of“cloud-karst-fault”was clarified,and karst cave,fracture fissure-pore,and cloud pore type reservoir models were established,thereby expanding the exploration potential.Controlled by the superposition of multi-stage tectonic processes during the Indosinian,Yanshanian,and Himalayan,two genetic buried hill trap types of uplift-depression and depression-uplift were formed.Based on the analysis of reservoir-forming factors of the Ordovician buried hill,three buried hill oil and gas reservoir-forming models were identified:low-level tectonic-lithologic composite quasi-layered buried hill,medium-level paleo-storage paleo-block buried hill,and high-level paleo-storage new-block buried hill.Comprehensive evaluations indicate that the reservoir-forming conditions of the low-level tectonic-lithologic composite quasi-layered buried hill in the northern portion of the Jizhong depression are the most favorable and that the Sicundian and Xinzhen buried hills are favorable areas for future exploration.展开更多
【目的】为厘清流域面源污染源结构、精细化解析面源污染负荷时空特征,【方法】以SWAT(Soil and Water Assessment Tool)流域面源污染模型为基础,选取代表性水文系列,结合入库污染负荷计算模型,构建了污染负荷量及入库强度的面源污染关...【目的】为厘清流域面源污染源结构、精细化解析面源污染负荷时空特征,【方法】以SWAT(Soil and Water Assessment Tool)流域面源污染模型为基础,选取代表性水文系列,结合入库污染负荷计算模型,构建了污染负荷量及入库强度的面源污染关键源区识别技术流程,并在数据条件较为完备的沙河水库流域进行验证。【结果】结果表明:沙河水库流域总氮(Total Nitrogen,TN)入库负荷总量为198.34 t/a,面源污染占比为86.53%,流域内茶园TN负荷量贡献率最大,占比为23.84%;TN负荷量在丰水年和特丰水年比枯水年上升58.06%和289.09%,在年内丰水期TN月均负荷量比平水期和枯水期分别高出75.24%和372.51%;河道削减TN负荷量为33.58 t/a,削减比例为14.48%;子流域TN入库产污强度变化范围为0.36~4.73 t/km^(2)。面源污染排放入库低值区主要位于流域南部,高值区主要位于近库区域,沙河西和沙河东控制分区单位面积TN入库强度显著高于流域南部。【结论】针对高产污地类、高产污区域及高产污时段应提高面源污染防控力度;建立的技术流程可有效识别和科学解析流域面源污染关键源区,为流域水环境开展面源污染防治和生态适应性开发提供一定技术支持,使相关工作开展更加有的放矢。展开更多
基金major science and technology project of PetroChina“Research and application of key technologies for sustainable,effective and stable production exploration and development of North China Oilfield(2017e-15)”。
文摘The buried hill in the Jizhong depression contains abundant petroleum reserves and are important production areas.The Ordovician buried hill has restricted the discovery of new oil and gas exploration targets because of its strong reservoir heterogeneity and complex reservoir-controlling factors.Based on a large volume of core,thin section,logging,seismic,and geochemical data and numerous geological analyses,the reservoir-forming conditions and modes were systematically analyzed to guide the exploration and achieve important breakthroughs in the Yangshuiwu and Wen an slope buried hills.The study revealed that three sets of source rocks of the third and fourth members of the Shahejie Formation from the Paleogene and Carboniferous-Permian were developed in the Jizhong depression,providing sufficient material basis for the formation of buried hill oil and gas reservoirs.The reservoir control mechanism involving the three major factors of“cloud-karst-fault”was clarified,and karst cave,fracture fissure-pore,and cloud pore type reservoir models were established,thereby expanding the exploration potential.Controlled by the superposition of multi-stage tectonic processes during the Indosinian,Yanshanian,and Himalayan,two genetic buried hill trap types of uplift-depression and depression-uplift were formed.Based on the analysis of reservoir-forming factors of the Ordovician buried hill,three buried hill oil and gas reservoir-forming models were identified:low-level tectonic-lithologic composite quasi-layered buried hill,medium-level paleo-storage paleo-block buried hill,and high-level paleo-storage new-block buried hill.Comprehensive evaluations indicate that the reservoir-forming conditions of the low-level tectonic-lithologic composite quasi-layered buried hill in the northern portion of the Jizhong depression are the most favorable and that the Sicundian and Xinzhen buried hills are favorable areas for future exploration.
文摘【目的】为厘清流域面源污染源结构、精细化解析面源污染负荷时空特征,【方法】以SWAT(Soil and Water Assessment Tool)流域面源污染模型为基础,选取代表性水文系列,结合入库污染负荷计算模型,构建了污染负荷量及入库强度的面源污染关键源区识别技术流程,并在数据条件较为完备的沙河水库流域进行验证。【结果】结果表明:沙河水库流域总氮(Total Nitrogen,TN)入库负荷总量为198.34 t/a,面源污染占比为86.53%,流域内茶园TN负荷量贡献率最大,占比为23.84%;TN负荷量在丰水年和特丰水年比枯水年上升58.06%和289.09%,在年内丰水期TN月均负荷量比平水期和枯水期分别高出75.24%和372.51%;河道削减TN负荷量为33.58 t/a,削减比例为14.48%;子流域TN入库产污强度变化范围为0.36~4.73 t/km^(2)。面源污染排放入库低值区主要位于流域南部,高值区主要位于近库区域,沙河西和沙河东控制分区单位面积TN入库强度显著高于流域南部。【结论】针对高产污地类、高产污区域及高产污时段应提高面源污染防控力度;建立的技术流程可有效识别和科学解析流域面源污染关键源区,为流域水环境开展面源污染防治和生态适应性开发提供一定技术支持,使相关工作开展更加有的放矢。
