Fine Description Reservoir Sand Of The Lower-section Of ED₂ In Lu Da 10-1 Block

According to the geological characteristics of Ed2 L in Lu Da 10-1 block,based on the genetic model of reservoir,synthetically utilize all kinds of information includes geological,seismic,logging,production and other test data.We subtly divide braided river delta reservoir sand body in Lu Da 10-1 area,subdivide vertical time unit,thereby analyze the heterogeneity of braided river delta front subfacies reservoir from the level of sublayer.The main results of this study are:(1)According to the drill logging data and seismic survey data,the tectonic evolution of the region and the relevant documents,comparing with the small layer on the basis of the principle of the comparison cycle and hierarchical control,and paying attention to proper application of the principles of sedimentology in the matching process,appropriately adjusting in part to the stratigraphic boundaries of the second lower Dongying section ?,? group of small oil layers,then ? and ? oil group could be divided into 6 sand group,16 small layers.By comparison,in the study area,the small layer formation thickness changes little and the deposition is relatively stable,in accordance with the characteristics of shallow water braided river delta front(2)The Lower-Section of Ed2 L develops Shallow braided river delta front,Lu Da 10-1Oilfield as East Asia under section II,III oil group corresponds to two mid-fall hemicycle,mainly develops braided river delta front facies.Sediment source is from the northwest direction,and forms of the braided river delta front sedimentary system.(3)Through analyzing characteristics and formation conditions of argillaceous interlayer and calcareous interbeds,at the same time,using these interlayers,the single sand body is divided into several parts in the vertical direction.Then summarizing the boundary markers of the single sand body in the vertical upward section,descriping the single sand body and summarizing the correlation plane distribution regularities.(4)Reservoir heterogeneity is mainly controlled by sedimentary microfacies.In sedimentary unit,through some parameters which include the coefficient of variation of interlayer and intralayer,onrush coefficient and differential,represent the interlayer and intralayer heterogeneity.Through the analysis of the distribution of sand body,the plane distribution of permeability parameters of reservoir porosity,the plane heterogeneity of reservoir heterogeneity is controlled by sedimentary microfacies.