Method for Determining Cementation Index of Heterogeneous Carbonate Reservoir

A technology for carbonate reservoirs and cementation index, which is applied in earthwork drilling, wellbore/well components, instruments, etc., can solve the problems of old geological age, long evolution history, complex geological conditions, etc., and achieve a simple and convenient determination method , Improve the calculation accuracy and the effect of accurate parameters

CN106323835BActive Publication Date: 2019-04-09PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-04-09

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Abstract

The invention discloses a method for determining a heterogeneous carbonate reservoir cementation index. The method comprises the steps of selecting a plurality of core samples of a target reservoir; obtaining a corresponding relation between a cementation index of each core sample and irreducible water saturation; obtaining the irreducible water saturation of a core to be tested; according to the irreducible water saturation of the core to be tested, and the cementation index of the core to be tested is calculated on the basis of the corresponding relation.
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Description

technical field

[0001] The invention relates to the technical field of well logging evaluation of oil and gas reservoirs, in particular to a method for determining the cementation index of heterogeneous carbonate rock reservoirs. Background technique

[0002] The conductivity of reservoir rock mainly depends on the fluid properties, saturation state and its spatial distribution in the pore space. For heterogeneous carbonate reservoirs, the pore structure has a significant impact on the resistivity, and sometimes fractures and caves have a great influence on the electrical conductivity. The influence of resistivity far exceeds the influence of oil and gas. Many researchers have tried to get rid of the traditional method of calculating saturation by relying solely on resistivity curves for more than 70 years, and tried to use various non-electric logging methods to calculate saturation of carbonate rocks. The effect is not ideal. Therefore, so far, the calculation of saturati...

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Embodiment Construction

[0039] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0040] Such as figure 1 As shown, an embodiment of the present application provides a method for determining the cementation index of a heterogeneous carbonate rock reservoir, the method comprising the following steps:

[0041] S100: selecting a plurality of core samples of the target rock reservoir;

[0042] In order to better...