Method and device for determining carbonate reservoir geological reserves

Abstract

The invention provides a method and device for determining carbonate reservoir geological reserves. The method includes the steps of collecting electric imaging logging information of a carbonate reservoir and tested oil well information of the carbonate reservoir, dividing the carbonate reservoir into four classes of capacity areas according to the electric imaging logging information, determining reservoir effectiveness coefficients of the capacity areas according to the test oil well information, determining geological reserves of the four classes of capacity areas according to the reservoir effectiveness coefficients, and determining a total geological reserve according to the geological reserves of the four classes of capacity areas. The carbonate reservoir is divided into the four classes of capacity areas, the reservoir effectiveness coefficients of the capacity areas are determined according to the test oil well information, and therefore the total geological reserve of the carbonate reservoir is determined, accuracy for calculating the carbonate reservoir geological reserves is improved, and a basis is provided for guiding the development deployment of the carbonate reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploration, in particular to the processing technology of carbonate rock reservoirs, specifically a method and equipment for determining geological reserves of carbonate rock reservoirs. Background technique [0002] The reserves of oil and gas reservoirs include geological reserves and recoverable reserves, which are important national resource figures and an important basis for the deployment and development of oil and gas reservoirs. Therefore, determining the reserves of oil and gas reservoirs in the field of oil and gas field exploration technology is a very important task. The methods for determining reserves mainly include static method and dynamic method. Among them, the static method uses the static geological parameters of oil and gas reservoirs to calculate reserves according to the volume of pore space occupied by oil and gas fluids, also known as the volumetric method; the d...

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Problems solved by technology

However, for severely heterogeneous carbonate reservoirs, the heterogeneity and spatial continuity of reservoir spatial distribution are quite different, so the method of calculating geological reserves based on the static data of the formation around the wellbore——volume law, is restricted;

[0006] (2) The volumetric method is mainly suitable for relatively homogeneous oil and gas reservoirs. For carbonate reservoirs with strong heterogeneity developed by fractures and caves, the reserve calculation parameters such as porosity are not easy to determine. When the volumetric method is used for calculation, Difficulty and low accuracy make it difficult to directly apply the volumetric method to calculate the reserves of carbonate rock reservoirs;

[0007] (3) When using the traditional volumetric method to calculate carbonate reservoirs, the reserve parameters (oil and gas area, effective thickness, effective porosity, oil and gas saturation, etc.) are expressed by average values, which do not fully consider The heterogeneity factors of the reservoir will affect the accuracy of reserve calculation;

[0008] (4) The oil and gas saturations in the porous media of carbonate rocks are very different, and the occurrence states are very different, and the different combinations of these storage spaces in three-dimensional space make the fluid saturations in the same reservoir very different. One of the reservoir spaces is the representative, and the average value cannot be calculated simply. Therefore, the volumetric method is mainly suitable for relatively homogeneous reservoirs. For carbonate reservoirs with strong heterogeneity, the volumetric method is obviously not applicable.

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