区块链与金融有着天然的联系,区块链技术的发展与金融领域的转型升级密切相关。当前该交叉领域文献、专利数量增长迅速,迫切需要梳理出该领域研究热点和方向为后续研究人员提供一定的科技情报支撑。以国外Web of Science、国内CNKI数据...区块链与金融有着天然的联系,区块链技术的发展与金融领域的转型升级密切相关。当前该交叉领域文献、专利数量增长迅速,迫切需要梳理出该领域研究热点和方向为后续研究人员提供一定的科技情报支撑。以国外Web of Science、国内CNKI数据库文献和智慧牙专利数据库收录的国内专利信息为检索源,采用文献计量、可视化分析工具CiteSpace和专利标引统计法,从不同角度对该领域整体研究现状、热门和前沿进行比较分析。研究发现:共识机制、智能合约、与新一代信息技术的融合、信息安全等是国内外“区块链+金融”领域技术研究的难点和热门;基于中小企业融资的供应链金融创新实践、防范金融风险、绿色金融等是目前该领域应用发展的热点和前沿,同时也是该领域主要的研究方向。最后,从强化基础技术研究、核心技术攻关、产业生态的完善及产品、场景的推广示范等方面提出推动“区块链+金融”研究的对策建议。展开更多
The tight sandstones in the Permian Lower Shihezi Formation of Shilijiahan area in the Ordos Basin was taken as study object in this research to quantitatively determine the effects of burial depth, burial time and co...The tight sandstones in the Permian Lower Shihezi Formation of Shilijiahan area in the Ordos Basin was taken as study object in this research to quantitatively determine the effects of burial depth, burial time and compaction strength on porosity during densification of reservoir. Firstly, sandstone compaction profiles were analyzed in detail. Secondly, the theoretical study was performed based on visco-elasto-plastic stress–strain model. Thirdly, multiple regression and iterative algorithm were used respectively to ascertain the variation trends of Young's modulus and equivalent viscosity coefficient with burial depth and burial time. Accordingly, the ternary analytic porosity-reduction model of sandstone compaction trend was established. Eventually, the reasonability of improved model was tested by comparing with thin-section statistics under microscope and the models in common use. The study shows that the new model can divide the porosity reduction into three parts, namely, elastic porosity loss, visco-plastic porosity loss and porosity loss from cementation. And the results calculated by the new model of litharenite in He 2 Member are close to the average value from the thin-section statistics on Houseknecht chart, which approximately reveals the relative magnitudes of compaction and cementation in the normal evolution trend of sandstone porosity. Furthermore, the model can more exactly depict the compaction trend of sandstone affected little by dissolution than previous compaction models, and evaluate sandstone compaction degree and its contribution to reservoir densification during different burial and uplift processes.展开更多
文摘区块链与金融有着天然的联系,区块链技术的发展与金融领域的转型升级密切相关。当前该交叉领域文献、专利数量增长迅速,迫切需要梳理出该领域研究热点和方向为后续研究人员提供一定的科技情报支撑。以国外Web of Science、国内CNKI数据库文献和智慧牙专利数据库收录的国内专利信息为检索源,采用文献计量、可视化分析工具CiteSpace和专利标引统计法,从不同角度对该领域整体研究现状、热门和前沿进行比较分析。研究发现:共识机制、智能合约、与新一代信息技术的融合、信息安全等是国内外“区块链+金融”领域技术研究的难点和热门;基于中小企业融资的供应链金融创新实践、防范金融风险、绿色金融等是目前该领域应用发展的热点和前沿,同时也是该领域主要的研究方向。最后,从强化基础技术研究、核心技术攻关、产业生态的完善及产品、场景的推广示范等方面提出推动“区块链+金融”研究的对策建议。
基金Supported by the National Natural Science Foundation of China(4167212441502147)PetroChina Science and Technology Major Project(2016ZX05047001-002)
文摘The tight sandstones in the Permian Lower Shihezi Formation of Shilijiahan area in the Ordos Basin was taken as study object in this research to quantitatively determine the effects of burial depth, burial time and compaction strength on porosity during densification of reservoir. Firstly, sandstone compaction profiles were analyzed in detail. Secondly, the theoretical study was performed based on visco-elasto-plastic stress–strain model. Thirdly, multiple regression and iterative algorithm were used respectively to ascertain the variation trends of Young's modulus and equivalent viscosity coefficient with burial depth and burial time. Accordingly, the ternary analytic porosity-reduction model of sandstone compaction trend was established. Eventually, the reasonability of improved model was tested by comparing with thin-section statistics under microscope and the models in common use. The study shows that the new model can divide the porosity reduction into three parts, namely, elastic porosity loss, visco-plastic porosity loss and porosity loss from cementation. And the results calculated by the new model of litharenite in He 2 Member are close to the average value from the thin-section statistics on Houseknecht chart, which approximately reveals the relative magnitudes of compaction and cementation in the normal evolution trend of sandstone porosity. Furthermore, the model can more exactly depict the compaction trend of sandstone affected little by dissolution than previous compaction models, and evaluate sandstone compaction degree and its contribution to reservoir densification during different burial and uplift processes.
