Fine Description Study Of The Low Permeability Reservoi

The target stratum of study area M2 block, Fuyang oil layer is low permeable, in where development facing quick natural decline and low oil production. In order to improve the effect of oilfield development, meet the needs of comprehensive development and adjustment,it is necessary to carry out fine reservoir description research in M2 block. Based on regional geological understandings, take the theory of sequence stratigraphy and sedimentology as the guide, and comprehensively use the core data, logging and seismic data, the review and interpretation of reservoir structure, fine reservoir description and flow units classification and remaining oil distribution research have been completed. On the basis of the top structure review in Fuyu reservoir, the fine reservoir interpretation of top structure was carried out, as the trend surface constraint, apply the top depth data of sandstone in the main reservoir, plane sedimentary microfacies control, the micro structure research of main layer have been taken,while the contour accuracy is to 2m to find out the reservoir structure characteristic. Based on the whole oilfield stratum statistics skeleton profile, the contrast frameworks of M2 block has been established. the vertical layer is been divided to sedimentary units: single river channel,fine division and correlation of block has been completed. Combined with coring analysis various types of log microfacies models are established and unit sedimentary microfacies study is carried out, more than 60 units micro phase diagram have been taken which makes plane distribution of sand body and connectivity clear; Taking comprehensive analysis of reservoir physical parameters and formation coefficient, carry out the porosity, permeability and formation coefficient contour map drawing and distribution research under the control of facies in the main reservoir unit, determine the reservoir flow unit classification parameters,combined with the formation coefficient cumulative probability distribution, using truncation method to carry out flow unit classification, which makes distribution of flow units clear.Establish fault model with 3D fault data of the seismic interpretation, and establish structure model based on hierarchical data, vertical layer is in accord with the fine geology dividing sedimentary unit. Facies model is established on sedimentary microfacies diagrams. Take the sedimentary facies model as the constraint, establishing 3D reservoir geological model which can be able to characterize the feature of reservoir quantitatively. Combination of static and dynamic analysis of the genetic types and distribution rules of remaining oil, it provide scientific evidence for the further reasonable effective development in oilfield.