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

A technology of reservoir fluid properties and formation fluids, which is applied in earth-moving drilling, wellbore/well components, etc., can solve the problems that the method cannot be fully put into production application, the degree of dependence on manual identification is high, and the identification of unpublished fluid properties, etc. Effects that are easy to understand and apply

Active Publication Date: 2019-03-01
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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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 proce...

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

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Embodiment 1

[0075] A method for identifying formation fluid properties by using gas logging power spectrum equivalent index, comprising the following steps:

[0076] a. Calculate the power spectrum, and establish the power spectrum diagram according to the calculation results;

[0077] b. Partition the established power spectrum diagram;

[0078] c. Calculate the equivalent identification index of mud logging gas logging power spectrum according to the partitioned power spectrum diagram;

[0079] d. Determine the reservoir fluid properties according to the equivalent identification index according to the judgment rules.

[0080] Described step a specifically comprises:

[0081] a1. Data preparation;

[0082] a2. Fast Fourier transform and power spectrum calculation: prepare the mud logging gas logging data array obtained in a1 Perform fast Fourier transform to obtain the corresponding complex sequence;

[0083] a3. Establishment of the power spectrum diagram: calculate a2 to obtain ...

Embodiment 2

[0120] The implementation steps of the present invention can be decomposed into the following four items: 1) power spectrum calculation and power spectrum diagram establishment; 2) power spectrum diagram partition; 3) mud logging gas measurement power spectrum equivalent recognition index calculation; 4) according to the judgment rule according to The equivalent identification index determines reservoir fluid properties.

[0121] 1) Power spectrum calculation and power spectrum diagram establishment

[0122] (1) Data preparation

[0123] Assuming that the mud logging gas logging parameters to be processed constitute a time series X t , where, t=1,2,3,..., m, let m=2 x +y, and y is the minimum value listed in the above expression. When y=0, directly use the above gas measurement parameter sequence. When y0 , the y existing data points are removed. In summary, the gas logging parameters to be processed are adjusted to m=2 x data points.

[0124] The data are then detrended,...

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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...

Claims

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Application Information

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IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 赵磊
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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