Research On Geological Knowledge Exchange Model Based On Knowledge Graph

With the continuous development of Digital China,oilfield enterprises are also undergoing digital transformation,and the development of digital is facing a key problem,which is knowledge sharing,in which knowledge exchange is the main method to realize knowledge sharing.As we all know,geological knowledge is an important basis for the construction of digital oilfield.However,the explosive growth of geological knowledge and the wide range of geological knowledge make the construction of Digital Oilfield face many problems related to the standardization of geological knowledge.For example,only part of the geological data of some departments are stored in a structured form,The vast majority of geological knowledge data exist in the form of semi-structured or unstructured,not only that,these geological knowledge data are stored in different departments,some data are still stored in the form of paper media,which brings great inconvenience to the sharing of geological knowledge data.These scattered data can not meet the requirements of standardization.The geological knowledge is not linked together by a unified standard and specification,resulting in the geological "knowledge island" phenomenon,which will inevitably lead to users unable to share the knowledge.Geological knowledge data is an important scientific basis for scientific researchers to make decisions on oil exploration,reservoir discovery and injection production plan.Due to the complexity and particularity of geological knowledge,the construction of Digital Oilfield also puts forward higher requirements for the organization,representation,retrieval and exchange of geological knowledge.With the development of semantic web technology system,ontology theory provides theoretical support for knowledge organization and representation.The successful implementation of knowledge graph provides technical support for the construction of large-scale knowledge base,and also provides an opportunity for the sharing and exchange of geological knowledge.In order to solve the problem of knowledge sharing in geological field.Firstly,the thesis makes a full investigation on the field and literature of oil fields,such as knowledge exchange,domain knowledge graph and geological knowledge standardization.Through investigation,the research results at home and abroad are analyzed in combination with the comparison.Taking the stratigraphic and reservoir fields in the geological field as an example,the standards defined in the China Stratigraphic Guide and China Stratigraphic Guide,stratigraphy foundation and frontier,the Chinese petroleum subject vocabulary and the oil and natural gas industry standard of the people’s Republic of China SY / T6169-1995 are taken as the basis.According to ontology theory and technology,some of the important concepts and semantic relations between them are extracted from these achievements,and a series of thematic conceptual system models in geological field are defined and constructed.Then,the above-mentioned definition and the conceptual system model of series of geological themes are standardized,and these series of thematic concept system models are mapped to the OWL ontology model of W3 C,and these series of geological theme ontology models are constructed.These series of geological theme ontology models play the role of knowledge models in knowledge exchange.According to these geological subject ontology models,combined with specific geological case data,the construction of geological knowledge graph is completed.Finally,in order to realize the storage and management of these knowledge,the knowledge graph is stored in the Neo 4J graph database,which is convenient for management and exchange application.Finally,in order to verify the effectiveness of the proposed knowledge exchange model,a knowledge exchange prototype system is further designed and developed.By connecting the neo4 j map database,and based on the constructed geological ontology knowledge exchange model,the platform is built with springboot framework,and the geological domain knowledge mapping is realized with d3.js,The geological knowledge exchange system is designed and developed to realize the functions of standardized representation,retrieval,visualization,exchange and download of geological knowledge.Through the above research and the implementation of the prototype system,it shows that the geological domain knowledge exchange system proposed in this thesis can effectively solve the problem of knowledge sharing between geological domains,provide a convenient way for the geological domain knowledge exchange,and lay the foundation for the next step to expand to the whole geological domain and provide more data formats for knowledge exchange and sharing.