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Stratigraphic comparison method based on dynamic time warping algorithm

A technology of dynamic time warping and stratigraphic correlation, applied in the field of oil and gas exploration, can solve the problems of difficult logging reservoir evaluation, different results of two divisions, etc.

Pending Publication Date: 2022-08-02
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Although this method has high flexibility, it is easily affected by subjective factors in the comparison and division: for the same target well, different people may have sub-layer division results, even if the same person divides the same well, twice The division results may also be different
This brings great difficulty to the reservoir evaluation of well logging

Method used

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  • Stratigraphic comparison method based on dynamic time warping algorithm
  • Stratigraphic comparison method based on dynamic time warping algorithm
  • Stratigraphic comparison method based on dynamic time warping algorithm

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Embodiment 1

[0045] like figure 1 As shown, the present embodiment provides a stratigraphic comparison method based on a dynamic time warping algorithm, which includes the following steps:

[0046] 1. Data set preparation:

[0047] The model proceeds as follows:

[0048] First extract the natural gamma (GR) curve, acoustic transit (AC) curve and the corresponding sub-layer depth data of the standard well in the study area. After the above steps, the data of the standard well is ready. For the target well to be matched, the natural gamma curve and the acoustic time difference curve can be extracted. At this point, two sets of corresponding data sets are prepared.

[0049] 2. Use the Hermitian interpolation method to interpolate the target well data:

[0050] The model proceeds as follows:

[0051] a) Input the logging data of the target well, and form two sets of sequence data according to the logging depth, natural gamma, and acoustic time difference, respectively (X i , Y i 1 ), (...

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Abstract

The invention relates to the field of petroleum and natural gas exploration, in particular to a stratigraphic comparison method and system based on a dynamic time warping algorithm, which is characterized by comprising the following steps of: preparing a data set comprising logging data of a standard well and logging data of a target well needing stratigraphic division; if the sampling rate of the target well is not 0.125, performing interpolation on the logging data of the target well by using a Hermite interpolation method; calculating the mahalanobis distance between the logging curves of the standard well and the target well; and performing dynamic matching of the target well logging curve by adopting a dynamic time warping algorithm. Accurate matching between the small layer of the target well and the small layer of the standard well can be achieved through calculation of the steps. According to the small-layer comparison method provided by the invention, matching errors caused by subjective factors during manual small-layer comparison are removed, and the small-layer comparison, especially the working efficiency when the logging data volume is huge, can be improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a method and system for stratigraphic comparison based on a dynamic time warping algorithm, Background technique [0002] Stratigraphic division and comparison are the basis of reservoir research work and the premise for describing reservoir morphology and the spatial distribution characteristics of its parameters. Only by dividing the sub-layers reasonably can the interlayer heterogeneity of the multi-strata be correctly revealed, and only by establishing the correct sub-layer fine comparison and division method, can the spatial variation of the reservoirs at all levels be explained in the entire research area. law. The traditional sub-layer comparison and division methods usually manually observe the morphological characteristics of the log curves of the natural gamma and acoustic time difference of the sub-layer between the target well and the standard well, and then ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00G06F30/20G06F17/16G06F17/18G06F119/12
CPCG01V11/00G06F30/20G06F17/16G06F17/18G06F2119/12
Inventor 赵军焦世祥巫振观贾将曾天怡杨巍陈雁程超张少敏
Owner SOUTHWEST PETROLEUM UNIV
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