Hydrocarbon saturation evaluation method based on non-conductive pore model

Abstract

The invention provides a hydrocarbon saturation evaluation method based on a non-conductive pore model, and belongs to the field of oil-gas exploration and development. The method includes determining non-conductive porosity in a stratum and the ratio in the total porosity according to rock physical experiments, and utilizing an evaluating equation based on the non-conductive pore hydrocarbon saturation to determine the hydrocarbon saturation of a reservoir stratum. The method is effective to complex reservoir stratum, which is not adaptable to the traditional Archie theory, hydrocarbon saturation quantifying evaluation; lithological background conductivity factors are taken into account, and the method is particularly adaptable to the reservoir stratum which has large changes in lithology and strong heterogeneity; the method is adaptable to hydrocarbon saturation evaluation of complex reservoir stratums of various volcanic rocks, fractured carbonate rocks, metamorphosed rocks and the like, and reliable technique support is provided for efficient exploration and development of complex oil and gas reservoirs.

Description

technical field [0001] The invention belongs to the field of oil and gas exploration and development, and in particular relates to an oil and gas saturation evaluation method based on a non-conductive pore model. Background technique [0002] Using well logging data to determine oil and gas saturation in reservoirs is the basis for efficient exploration and development of oil and gas fields, and is also the core of reservoir logging evaluation. As early as 1942, Mr. Archie (Petroleum Logging Engineer of Shell Company) published the famous Archie formula, which laid the foundation for the quantitative evaluation of oil and gas saturation, and has been widely used in actual production. The mainstream method of degree quantitative evaluation. Traditional Archie's theory is suitable for clean sandstone reservoirs dominated by primary intergranular pores and relatively large porosity (generally greater than 15%). For this type of reservoir, according to Archie's theory, the acc...

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Problems solved by technology

[0007] Obviously, these methods do not deviate from the framework of Archie’s theory in essence, and the evaluation accuracy of oil and gas saturation is difficult to grasp. In the actual operation process or based on personal experience, the randomness is relatively large; or the operation is too complicated to be popularized. use

Moreover, it should be noted that Archie's theory is limited by its application conditions. For those reservoirs with a large number of isolated pores and extremely heterogeneous distribution of storage space, they fundamentally do not meet the application conditions of Archie's theory. , it cannot be corrected

[0008] In terms of electrical conductivity, pores are divided into conductive pores and non-conductive pores. The fundamental reason for the "non-Archietization" of reservoirs is that the distribution of non-conductive pores in complex reservoirs is different from that of traditional Archie reservoirs, which leads to the inconsistency of Archie's theory. Inadaptability

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