Study On Sedimentary Microfacies Characteristics Of S₃² Sub-member Of Shen161 Block In Damintun Sag Of Liaohe Oilfield

Shen 161 block of damintun sag, liaohe oilfield in recent years, the important of development adjustment in old blocks target horizon is S32 and segment.This paper mainly analyzed the sedimentary microfacies of block development within, to better study the remaining oil potential.In this paper, based on stratigraphic sequence stratigraphy theory instruction, with 3 d seismic data and well log data, on the basis of fully collecting predecessors’ research results,establish shen 161 block of S32 and stratigraphic framework, completed the stratigraphic classification and correlation of the work, could be divided into four S32 and the period of formation oil layer group, 26 sandstone groups and 59 small layers.Because of the study area is located in the edge of lake basin, other factors such as sediment reflected underwater sedimentary characteristics concluded that main types of sedimentary facies of braided river delta front subfacies.Then, through the analysis of core,logging and other data were identified four types of sedimentary microfacies, respectively, are underwater distributary channel, mouth bar, distributary bay, sand sheet.In single well facies and section facies, sandstone thickness, formation, seismic attribute slice, reference, for the whole work area all kinds of plane distribution of sedimentary microfacies are studied.Work area provenance from the north and north west direction,channel sand body in the central area with constant cross together and development, in the east and south has certain sand sheet development.From the point of S32 and the period of the oil layer, bottom-up is a clear water cycle back, can be seen from the floor plan of sedimentary facies are also, S32 and segment Ⅳ reservoir group of underwater distributary channel microfacies development in the least to the upper S32 and I reservoir group of underwater distributary channel microfacies area development, formed a relatively complete vertical sequence of delta.Research in underwater distributary channel sand body and sand sheet is the best reservoir space within the work area, the sand body in the provenance direction extending far,amount of traffic is very good, vertical due to superimposition and multiphase channel sand body thickness;The latter is due to the lake washed repeatedly and good separation, pore permeability.Through the study of sedimentary microfacies distribution and thus provides a goodbasis to find favorable area, but also conducive to the interlayer contradiction and to develop the remaining oil.