Research On Depositional System Of Toutunhe Formation In Fudong–Xiquan Area,Junggar Basin

The eastern part of the Junggar Basin is the oil and gas enrichment area in the Junggar Basin,and the Toutunhe Formation is an important exploration horizon in the area.It is an important resource area for the continuous and stable production of oil fields in Xinjiang.At present,Fudong-Xiquan area has been found in a number of Toutunhe group of oil and gas reservoirs.However,due to stratigraphic framework,provenance conditions,sedimentary characteristics and the formation of sand bodies are not clear and other factors,restricting the pace of oil and gas exploration in the region.After several years of research,although the sedimentary system and the sedimentary microfacies characteristics of the area have a certain understanding,but with the deepening of the exploration,the accumulation of its particularity and complexity is more obvious,in order to speed up the progress of exploration,It is very important to characterize the sedimentary microfacies and the law of spatiotemporal evolution under the control of high frequency sequence framework.In this paper,based on the principle of "point-line-face-body" analysis,the characteristics and evolution of the sedimentary facies of the Middle Jurassic Toutunhe Formation in Fudong and Xiquan are carried out under the guiding ideology of " This paper focuses on the description and description of the characteristics of underwater distributary channel sand body,and provides theoretical guidance for the exploration and development of oil and gas in the future area.Get the main idea:1)After detecting,analyzing and comparing the core drilling in the work area,a set of working area logs and the corresponding core of the study area were established.It was judged that the sedimentary types of the Jurassic Toutunhe Formation were mainly braided river Delta facies deposition.2)According to the heavy mineral content and distribution of clastic rocks and the analysis of palaeogeomorphological analysis,the source of the study area is mainly from three directions: the Kelameili Mountain,the North three tai direction and the Bogeda Mountain,and the surface water and groundwater flow channel That is,the ancient trench and the relatively low terrain is the deposition system of space distribution of the favorable conditions.3)Explain the logging curve data and analyze the lithologic characteristics of the stratum in the study area,so as to study and analyze the sedimentary characteristics of the Toutunhe Formation in the study area,and then have a concrete understanding of the depositionalsystem.4)The three sedimentary subfacies,eleven sedimentary microfacies plots and the comparative profiles of the strata in the study area are plotted,and the three sections of the Toutunhe Formation are analyzed by plane and profile data.Sedimentary facies division and evolutionary characteristics.