A method and device for identifying low-resistivity oil layers based on judgment index

Abstract

The invention provides a determination index based low resistivity oil zone recognition method and device. The determination index based low resistivity oil zone recognition method comprises the steps that a low resistivity oil zone of a target exploration region is defined; data information of the target exploration region is obtained to find out the confirmed low resistivity oil zone; the causes of the low resistivity oil zone are analyzed to determine a low resistivity oil zone recognition method suitable for the target exploration region, the experience judging indexes corresponding to the low resistivity oil zone recognition method are calculated, and the distribution range of the experience judging indexes is obtained; a suspended low resistivity oil zone of the target exploration region is looked up, and the target judging indexes of the suspended low resistivity oil zone are calculated; and a recognition result of the suspended low resistivity oil zone is determined according to the distribution situation of the target judging indexes in the distribution range. By utilizing the embodiments of the method, multiple oil zone recognition methods can be comprehensively considered, the uncertainty and correct judgement probability in the judging process can be embodied in a quantitative mode, the subjective influence of artificial recognition can be reduced, and the recognition correction rate can be improved.

Description

technical field [0001] The application belongs to the field of reservoir logging evaluation in the exploration and development of clastic rock oil and gas reservoirs, and in particular relates to a low-resistivity oil layer identification method and device based on a judgment index. Background technique [0002] Compared with normal oil and gas layers, the resistivity of low-resistivity oil and gas layers is lower, even lower than that of water layers. It is more difficult to identify, and the accuracy is usually not high. Oil well stimulation measures based on this often have missing oil layers and replenished water layers. It will cause great obstacles to the implementation of later measures, and it will also be difficult to meet the reserve base and technical requirements for strata succession. With the continuous development of oil and gas, most oil fields in my country have entered the middle and late stages of development, and the unidentified low-resistivity oil layer...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that various existing low-resistivity oil layer identification methods have different applicable conditions, lack a means of comprehensively utilizing multiple methods for judgment, and the existing methods do not reflect the uncertainty and judgment probability of the judgment process. To solve this problem, a method and device for comprehensive identification of low-resistance oil layers based on the judgment index is proposed, which can comprehensively consider various oil layer identification methods, and can quantitatively reflect the uncertainty and probability of judgment in the judgment process

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