Method for predicting hydrocarbon column height of medium-deep oil and gas reservoir

Abstract

The invention relates to a method for predicting the hydrocarbon column height of a middle-deep layer oil and gas reservoir. The method comprises the steps: calculating the net buoyancy of the whole oil and gas reservoir according to the hydrocarbon column height of a drilled well; and applying the same net buoyancy to all the oil and gas reservoir units in the oil and gas reservoir range, and further calculating the hydrocarbon column heights of the oil and gas reservoir units which do not drill the oil-water interface and the gas-oil interface at the same time. The plugging capacity of the whole oil and gas reservoir is quantitatively calculated by utilizing the hydrocarbon column height of the drilled fluid interface oil and gas reservoir unit, so that the situation that the hydrocarboncolumn height is calculated by directly calculating capillary force is avoided, the parameters are easy to obtain, the calculation method is simple, the parameters are few and easy to master, and each well does not need to drill an oil and gas interface and an oil-water interface; according to the hydrocarbon column heights of the oil and gas reservoir units partially drilled to the gas-oil interface and the oil-water interface at the same time, the hydrocarbon column heights of other oil reservoir units not drilled to the gas-oil interface and the oil-water interface at the same time can berapidly obtained, and then the oil and gas reserve prediction result of the whole oil and gas reservoir can be obtained.

Description

Technical field[0001]The invention relates to the technical field of oil and gas development, in particular to a method for quantitatively predicting the height of a hydrocarbon column in an oil and gas field in a deep oil and gas reservoir.Background technique[0002]As a complex type of gas-cap oil-ring oil and gas reservoir, it is necessary to estimate the geological reserves of natural gas and crude oil as much as possible before development, so as to reduce the risk of inadaptability of engineering facilities.[0003]Currently, quantitative calculation of the plugging capacity of mudstone caprocks or faults can be used to calculate the height of the hydrocarbon column. The core of the quantitative calculation of mudstone caprock or fault plugging capacity is to calculate its capillary force. The capillary force calculation requires key parameters such as the radius of the bellows, the radius of the pore, and the interfacial tension of different fluids. However, parameters such as r...

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Problems solved by technology

However, parameters such as tunnel radius, pore radius, and interfacial tension are closely related to shale content, lithological particle size, and fluid properties, and vary in space. It is difficult to obtain these accurate parameter values ​​in actual production feasibility studies. Calculation error is large

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