Abstract:

Two-Step Stochastic Simulation is employed on the basis of the characteristics of P₂w¹ conglomerate oil reservoir in block 530 of Karamay oilfield namely; seismic phase, logging phase, well testing phase as well as data collected from analysis of the rock cores etc. are used in setting up a succession indicator simulating reservoir sedimentary model and the semi-Markov simulating space distribution of reservoir property parameter either in consideration of sedimentary history or in consideration of sedimentary mechanism to simulate respectively sediments in the study area and characteristic parameters of reservoir physical property. It can be obviously observed from the static model of reservoir sedimentary facies established by setting up a succession indicator simulating reservoir sedimentary model that ancient waterflow entering sedimentary area from upper left part, and where subfacies of middle part of the fan and edge of the fan in the downdip block of the fracture deposit and subfaices of the fan top is absent, XW₃ sediments are uncontinuously and XW₂ sediments become gentle and even. It can be seen very clearly from reservoir characteristic parameters of the static model set up by the semi-Markov simulating technique that the thickness of XW₃ sediments is great and change frequently, the thickness of XW₂ sediments is small and with a distinct regularity. Variation value of XW₃ porosity and permeability is greater than that of XW₂ but saturation of oil content is on the contrary. It is believed by simulating predication that parameters of the reservoir physical property near the west section of Ke-Wu fracture zone is better than that of other sections, and which is a favorable oil and gas reservoir region where first priority for prospecting should be given.16 wells have been cancelled from well pattern(saved drilling footage 4.27?10⁴ m) because of the reservoir space distribution regularity accurately expressed by the static model of the reservoir.

Key words: Conglomerate oil reservoir, stochastic simulation, succession indicator simulating, semi-Markov simulating, Karamay oilfield