Calculation Method of Bitumen Content in Carbonate Reservoir

Abstract

The invention discloses a method for calculating the asphalt content of a carbonate reservoir. The method comprises the following steps: a, based on laboratory analysis on a nuclear magnetic resonance T2 spectrum of asphalt, proposing fundamental assumption of a theoretical model; b, establishing a theoretical model of the asphalt content of the carbonate reservoir; c, establishing the relationship between each physical quantity in the theoretical model of the asphalt content of the carbonate reservoir and logging information; d, obtaining a computational formula of the asphalt content of the carbonate reservoir; and e, inputting logging data obtained from corresponding logging items into the computational formula of the asphalt content of the carbonate reservoir obtained in the step d to obtain the asphalt content of the carbonate reservoir. By the method, nuclear magnetic resonance logging information and conventional logging information are organically integrated for the first time, and based on theoretical derivation in rock physics, the theoretical model of the asphalt content of the carbonate reservoir is established; and the theoretical model is not specific to a geological body or block with certain characteristics, so that the theoretical model is high in universality.

Description

technical field [0001] The invention relates to the technical field of petroleum geological logging data analysis and processing, in particular to a calculation method for asphalt content in carbonate rock reservoirs. Background technique [0002] Asphaltene is common in carbonate reservoirs. For example, the reservoir space of Cambrian Longwangmiao Formation reservoirs in the Gaoshiti-Moxi block of the Sichuan Basin is dominated by intergranular dissolved pores and intercrystalline dissolved pores, followed by intercrystalline dissolved pores. Most of the well sections developed dissolved caves and fractures, but core descriptions and fluorescent thin sections showed local black asphalt filling between particles and particle edges, and intergranular dissolved pores were partially filled by asphalt; the rock types of the Sinian Dengying Formation are mainly Includes dolomite, breccia, mud shale and chert. Psymnic dolomite, algae stromatolithic dolomite, grain-bonded dolomit...

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Problems solved by technology

[0004] However, the existing methods still have the following deficiencies: ①The current calculation methods are based on the asphalt content obtained from core experiments and logging physical quantities to establish regression formulas, and the theoretical basis is insufficient; ②Because it is aimed at a specific geological body, block, Even the regression formula established by a certain oil and gas well has poor applicability and is difficult to be extended to other different geological bodies or blocks.

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