Anatomy Of The Core Reservoir Architecture And Remaining Oil Distribution

This paper systematically analyzes and summarizes the characteristics of the single well reservoir architecture and remaining oil distribution of meandering river and braided river,used the sealed core well Gangxin4-23 well in the first fault block of Gangdong No 1 Zone.Comprehensive the core data,logging data,analysis assay data,etc.,guided by the theory and technology of fluvial sedimentology,reservoir geology,modern reservoir description,make fine dissection of the single well reservoir architecture of meandering river and braided river,and study on the remaining oil distribution.The specific steps include sedimentary characteristic analysis and sedimentary microfacies analysis based on the core data,determining that the Minghuazhen Formation is a meandering river sediment,the Guantao Formation is a braided river sediment,and analyzing the characteristics of sedimentary micofacies of meandering river and braided river.Then the identification of the interbed is carried out,and three types of interbeds are identified from the core data of the Gangxin4-23 well,including mud interbed,physical property interbed and calcareous interbed.The logging response characteristics corresponding to each type are clarified.After that the architecture bounding surfaces of each level are divided.The main architecture bounding surfaces include lithologic mutation surfaces,rhythm surfaces,etc.,and the seventh-order to tenth-order architecture bounding surfaces are determined.According to the architecture bounding surfaces of each level,the architectural elements are determined,and analyze the lithology and electrical characteristics of the eighth-order to tenth-order architectural elements,and establish the template of the meandering river and braided river architectural hierarchies and architectural elements’ characteristics of wells,in order to provide a basis for the division of the single well reservoir architecture.Combined with the analysis assay data,the remaining oil distribution under the control of seventh-order to tenth-order architectural elements is analyzed,and summarize the distribution of remaining oil in the architectural elements of each level.It will provide some help for the remaining oil potential tapping,so as to maximize the development of oil and gas resources.