Method for identifying formation fluid properties through gas measuring logging power spectrum equivalent index

Abstract

The invention discloses a method for identifying formation fluid properties through the gas measuring logging power spectrum equivalent index. The method comprises the following steps that a, a powerspectrum is calculated, and a power spectrogram is established based on the calculated result; b, the established power spectrogram is partitioned; c, according to the partitioned power spectrogram, the logging gas measuring power spectrum equivalent identification index is calculated; and d, according to the decision rule, the reservoir fluid properties are determined according to the equivalentidentification index. Single line operation is only conducted on the certain aspects of gas measuring data time-depth to frequency domain conversion, power spectrum partition, power spectrum equivalent identification index calculation and the fluid discrimination rule based on the equivalent identification index, the steps have coherence and irreversibility, and high operability and reproducibility are achieved.

Description

technical field [0001] The invention relates to a method for identifying formation fluid properties by using gas logging mud logging power spectrum equivalent index, and belongs to the technical field of mud logging data measurement and processing in the field of electromechanical field, petroleum and natural gas industry exploration and development. Background technique [0002] At present, in the field of mud logging gas measurement, it is usually limited to the time-depth domain. Visual observation is used to observe the overall trend, or to process and analyze data at a single point. There is no effective and practical technology in the field of overall analysis of large well sections. means to disclose or apply for a patent. The more traditional processing thought in the past was: "Only local processing is performed when there is an abnormal response or mud logging gas log display, and the well section without abnormality is not processed." [0003] Since 2015, Chuanqi...

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Problems solved by technology

[0003] Since 2015, Chuanqing Drilling Geological Exploration and Development Research Institute has started the overall analysis technology of large well intervals for mud logging and gas logging. In July 2016, it published the use of spectrum analysis technology The conference paper "A Gas Logging Interpretation Method Based on Time Series Method" for the detailed method of analyzing and processing the values ​​(version 1.0) and the implementation process was formally submitted to CNPC Southwest Oil and Gas Field Exploration Division in October 2016 in the project conclusion report. The improved version of spectrum analysis and fluid interpretation (version 2.0) is disclosed, and the geological basis and implementation process of the realization and application of spectrum analysis are described in detail. The degree is relatively high, and the method cannot be fully put into production application

[0004] In March 2017, Chuanqing Drilling Geological Exploration and Development Research Institute published a paper "A New Method for Identifying Gas and Water Layers of Longwangmiao Formation Gas Reservoirs in the Moxi Block of Anyue Gas Field by Mud Logging Parameters", which once again elaborated on the spectrum analysis method for processing mud logging gas logs. The application and practice of the data in the high-friction structure of the Sichuan-Chongqing gas region, but the identification of fluid properties and other content have not been published

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