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A method of intelligently dividing stratigraphic horizons based on well logging information

A stratum stratification and stratum technology, applied in the field of geological horizon division of logging interpretation and evaluation, can solve problems such as the influence of human factors in artificial horizon division, long working hours for accumulated experience, and difficulty in transferring horizon division experience.

Active Publication Date: 2020-01-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the usual way to divide stratigraphic layers is to compare and study the logging curves of the target wells without layer division and the logging curves of standard wells. To manually divide the stratum of the target well, which often requires the experience of professionals
[0003] However, the existing methods still have the following shortcomings: the artificial division of layers is affected by human factors, and the accumulation of experience requires a long working time
At the same time, on the one hand, it is difficult to transfer the experience of layer division; on the other hand, with the deepening of exploration and development, the geological understanding changes, and the layer division may be changed according to the new understanding

Method used

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  • A method of intelligently dividing stratigraphic horizons based on well logging information
  • A method of intelligently dividing stratigraphic horizons based on well logging information
  • A method of intelligently dividing stratigraphic horizons based on well logging information

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Embodiment 1

[0092] For the first time, the invention proposes the concept of intelligently dividing stratum horizons based on logging information, and finds a corresponding calculation method, thereby achieving the purpose of improving the stratum horizon dividing accuracy.

[0093] a. Find the peaks and troughs of the curve;

[0094] b. Calculate the relative depth difference and measurement coordinate difference between the two wells;

[0095] c. Smooth the input curve;

[0096] d. Single curve similarity detection;

[0097] e. Multi-curve similarity detection;

[0098] f. Establish a stratigraphic model based on a single curve;

[0099] g. Establish a multi-curve stratigraphic stratification model.

[0100] In the described step a, find the curve crest and the trough calculation process as follows:

[0101] Known curve X={x1,x2,x3,...xn}, X1={x2,x3,x4,...xn,xn+1}, let X2=X1-X, get the difference between adjacent points, the A point meets one of the following two characteristics: ...

Embodiment 2

[0164] a. Find the peaks and troughs of the curve;

[0165] b. Calculate the relative depth difference and measurement coordinate difference between the two wells;

[0166] c. Smooth the input curve;

[0167] d. Single curve similarity detection;

[0168] e. Multi-curve similarity detection;

[0169] f. Establish a stratigraphic model based on a single curve;

[0170] g. Establish a multi-curve stratigraphic stratification model.

[0171] In the described step a, find the curve crest and the trough calculation process as follows:

[0172] Known curve X={x1,x2,x3,...xn}, X1={x2,x3,x4,...xn,xn+1}, let X2=X1-X, get the difference between adjacent points, the A point meets one of the following two characteristics:

[0173] (1) X2 is negative at position j and positive at j-1, then position j is a wave crest;

[0174] (2) X2 is negative at position j and 0 at j-1, then continue to search from j-1 until x2(j-m) is not equal to 0. At this time, if x2(j-m) is positive, then fro...

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Abstract

The invention discloses a method for performing intelligent division for the stratigraphic position based on logging information. The method comprises the following steps that a, the curve peak and valley are found; b, the relative depth difference and the measured coordinate difference between two wells are calculated; c, the input curve is smoothed; d, single curve similarity detection is performed; e, multi-curve similarity detection is performed; f, a stratigraphic division model based on the single curve is established; and g, a stratigraphic division model based on the multiple curves isestablished. According to the method, the idea of performing stratigraphic division by using the mathematical algorithm according to the logging information is put forward for the first time so thattwo problems of high artificial influence factor of stratigraphic division and difficulty of transmission of the division experience can be overcome, and the speed and the accuracy of stratigraphic division can be enhanced.

Description

technical field [0001] The invention relates to the technical field of well logging interpretation and evaluation, in particular to a method for intelligently dividing formation horizons based on well logging information, which is used for geological horizon division of well logging interpretation evaluation. Background technique [0002] In the process chain of logging interpretation and evaluation, the division of geological horizons is a more critical step. At present, to divide the stratum horizon, the usual practice is to compare the logging curve of the target well without horizon division with the logging curve of the standard well. When the horizon division of the standard well is known, To manually delineate the layers of the target well, which often requires the experience of professionals. [0003] However, the existing methods still have the following shortcomings: there is the influence of human factors in the manual division of layers, and the accumulation of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 王勇军姜艳玲罗利赵中明胡振平陈邦定陈海祥黄宏张树东熊宇
Owner BC P INC CHINA NAT PETROLEUM CORP
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