Method for macroscopically quantizing microscopic remaining oil in different occurrence states

Abstract

The invention discloses a method for macroscopically quantizing microscopic remaining oil in different occurrence states. The method includes the steps: acquiring a remaining oil reserve distribution field and a water saturation distribution field by macroscopic numerical simulation; determining the range of underground water saturation under the condition of different washing degrees according to washing degree differentiating standards and original water saturation, and obtaining macroscopic remaining oil reserve with different washing degrees according to the remaining oil reserve distribution field and the water saturation distribution field; determining the washing degree of a rock core in a current state by water saturation correction test for a coring well, determining the relative content of the microscopic remaining oil in different occurrence states by microscopic observation test for oily slices of the coring well, and counting to obtain the relative content of the microscopic remaining oil in different occurrence states under different washing degrees; and macroscopically quantizing the microscopic remaining oil by applying computation expression for microscopic remaining oil mass in different occurrence states according to the macroscopic remaining oil reserve with different washing degrees and the relative content of the microscopic remaining oil in different occurrence states under different washing degrees.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for macroscopically quantifying residual oil in different microcosmic states. Background technique [0002] Since the 1980s, the study of the distribution of remaining oil has attracted widespread attention from all oil-producing countries in the world. The amount and occurrence of remaining oil are the basic conditions for further enhanced oil recovery. At present, the remaining oil research is mainly divided into two aspects: one is the macroscopic remaining oil that reflects the distribution of remaining oil between wells and layers; the other is the microscopic remaining oil that reflects the distribution of remaining oil in the rock pore structure. The macroscopic remaining oil can be quantified by using numerical simulation technology, and the microscopic remaining oil can be obtained by analyzing the oil-bearing thin slices of cored well...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for macroscopic quantification of remaining oil in different microscopic occurrence states, aiming to solve the problem that currently only the relative amount of microscopic remaining oil in different occurrence states or the absolute amount in tiny samples can be obtained, and it is impossible to characterize the remaining oil in the actual reservoir The Absolute Quantity of Microscopic Remaining Oil in Different Occurrence States

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