Method of determining reservoir water saturation

Abstract

The invention discloses a method for determining reservoir water saturation, which comprises the following steps of: obtaining the porosity and permeability of a rock core, and establishing a porosity-permeability calculation model by combining acoustic logging data; Obtaining a saturation index n value, and establishing a reservoir resistivity calculation model when the water content is 100%; Respectively establishing a calculation model of irreducible water saturation and residual oil saturation; Determining the resistivity of the original formation water and the resistivity of the slurry filtrate of the oil reservoir by utilizing test analysis, and determining the resistivity of a pure oil layer by irreducible water saturation, residual oil saturation, resistivity of a flushing zone anda saturation index; And establishing a new reservoir water saturation calculation model, and calculating the reservoir water saturation through the reservoir measurement resistivity, the reservoir resistivity when the water content is 100%, the pure oil layer resistivity and the irreducible water saturation. According to the method, the water saturation of the reservoir stratum is solved point bypoint through logging data without depending on an alpha formula under the condition that formation water resistivity of different stratum sections of the stratum is unknown, and a new method is provided for accurately solving the water saturation of the reservoir stratum.

Description

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AI Technical Summary

Benefits of technology

This technology helps calculate the amount (water) remaining within an underground hydrocarbon-bearing layer during drilling operations or production from wells. By measuring this data over time it becomes easier than just looking at how much liquid remains inside each section of the stratum.

Problems solved by technology

This patented problem addressed in this patents relates to determining the amount or degree of water present within certain areas (reservoir) during drilling operations due to factors like pressure changes caused by fluid movement inside these zones. These issues affect how well hydrocarbon recovery occurs at various depth levels throughout the life cycle of subterranean petroleum exploration projects. Current techniques such as gamma ray analysis require expensive equipment that may only work properly when there has no significant change over multiple months.

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