Fine Geologic Study Of Guantao Formation In North Chenjiazhuang Oilfield

Chenjiazhuang oilfield reservoir for the lower part of Guantao formation,based on the characteristics and sedimentary environment of the area,museum section is sedimentary characteristics of fluvial facies,fluvial facies sandstone has small single layer thickness of single sand body size,lateral changes,even the characteristics of vertical superposition.The frequent oscillation of the channel is affected by the seasonal flood,which causes the transformation of the channel sand body in the vertical plane and the plane,and the heterogeneity is strong.Because of the lateral and lateral migration of the river,the single sand body has a large lateral variation,and it is difficult to predict the sand body boundary.In addition,this area belongs to lithologic stratigraphic subtle reservoir exploration and development,the main problem is the division of sand group,reservoir description and prediction problems,is particularly important for the description and identification of sand body.In view of the existing problems,this topic through the seismic,drilling and logging,analysis of oil production,comprehensive information,the establishment of stratigraphic framework,clear micro structural features,sedimentary facies and sedimentary facies model are established,in addition to carry out research on the reservoir characteristics in order to find out the method to describe the formation in Guantao area of channel sand reservoir layer accurately and effectively for the next rolling productivity construction direction.In this paper,the relationship between the same direction of the seismic reflection and the abrupt change of the rock electricity is identified.About the study area under section four hall divided the cycle: a cycle corresponding to the entire museum under section,two cycles corresponding to sand group,three cycles corresponding to small layers,four cycles corresponding to monolayer.Through the study of sedimentary facies,determine the area under section 5 Museum Museum sand group is a typical braided river facies,under 4 and under 3 Museum Museum sand group is a transitional river facies,2 and 1 under the Pavilion Pavilion is a typical meandering river facies.The analysis using frequency division processing technology to describe the reservoir in the research area,through frequency scanning,not only predicted the distribution of sand body,but also a clear evolution of sands,understand the heterogeneity of sand body,reservoir distribution and the Guantao group each sand group.