Study On Sedimentary Facies Of Yingcheng Formation And Denglouku Formation In Xuxi-Changde Gas Field

Xuxi-Changde area of Yingcheng Formation and Denglouku Formation have abundant phase types,has abundant oil and gas resources,so we study the sedimentary facies,subfacies and microfacies of these areas for more detailed research to guarantee the further evaluation of the rational development of oil and gas and gas resources.Depending on the previous research and associating with the existing stratigraphic classification plan of Xu Xi-Changde area of Yingcheng and Denglouku Formation,we analyzed the stratigraphic development characteristics of these areas carefully,even based on the comprehensive analysis and utilization of regional geological data,well logging and core data and geological profile data.Furthermore,guiding by the high resolution sequence stratigraphy theory of Cross,we devised the stratum of the Xuxi-Changde area of Yingcheng and Denglouku formation.A high resolution sequence stratigraphic framework based on short term base level cycle is established.The formation of the study area is divided into 9 short-term cycles.Except the first area of Yingcheng formation,all other groups in the study area have multiple sources.Based on the division of the bed succession and the analysis of the source direction,we studied the sedimentary facies and the evolution of sedimentary environment of Xuxi-Changde area of Yingcheng and Denglouku Formation.We depicted the plane distribution rule of each phase spread of sedimentary period of the research area meticulously.The development of the K1YC1 is volcanic facies,in which the two kinds of sub facies are mainly composed of eruption facies and volcanic sedimentary facies,the distribution range is relatively large,and the distribution range of overflow facies is small.K1YC4 developed as fan delta facies,mainly as the fan delta plain and fan delta front.In the K1D4 and K1D3 part of the study area,the braided river sediment was mainly developed.In the K1D2 of meandering river facies.Based on the process of this sedimentary evolution and the tectonic evolution characteristics,we finally established the pattern of the research area Yingcheng formation and Denglouku formation sedimentary period and provided a strong theoretical support for the next exploration and development of gas field and the evaluation of reservoir.