MICROFACIES RHYTHMIC CHARACTERISTICS OF FUTE CONGLOMERATIC OIL POOL AND THEIR EFFECTS ON DEVELOPMENT

On the basis of core observation and description,the depositional microfacies of Fute conglomeratic oil pool are divided and their rhythmic characteristics are studied by the comprehensive application of well logging interpretation data.It is considered that the district received clastic sediments from two matter source directions during the Asan sedimentation period and formed two completely different reservoir rock bodies.Between them,the master conglomeratic reservoir rock body,which belongs to fan delta frontal deposit,can be further divided into six microfacies.Different depositional microfacies have different extension,physical properties and reservoir developing degree for sand bodies,and possess distinct rhythmic patterns;and reservoirs with different depositional microfacies and rhythmic characteristics have different development features.Plane oil-water movement regularities are mainly controlled by depositional microfacies,while longitudinal oil-water movement regularities are mainly affected by the rhythmic patterns of permeability.At last,rational readjustment suggestions about the injection-production wells and measures of the oil pool are advanced by use of microfacies and rhythmic pattern study achievements,and good effects are obtained.