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Method for performing intelligent division for stratigraphic position based on logging information

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

Active Publication Date: 2018-09-21
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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  • Method for performing intelligent division for stratigraphic position based on logging information
  • Method for performing intelligent division for stratigraphic position based on logging information
  • Method for performing intelligent division for stratigraphic position based on logging information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] The present invention first proposes the concept of intelligently dividing stratum levels based on well logging information, and finds a corresponding calculation method, thereby achieving the purpose of improving the precision of stratum level division.

[0093] a. Find the peak and trough of the curve;

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

[0095] c. Smooth the input curve;

[0096] d. Single curve similarity detection;

[0097] e. Multi-curve similarity detection;

[0098] f. Establish stratum stratification model based on single curve;

[0099] g. Establish stratum stratification model based on multi-curve.

[0100] In the step a, the calculation process of finding the curve peak and trough is 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 peak A point conforms to one of two characteristics:

[01...

Embodiment 2

[0164] a. Find the peak and trough of the curve;

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

[0166] c. Smooth the input curve;

[0167] d. Single curve similarity detection;

[0168] e. Multi-curve similarity detection;

[0169] f. Establish stratum stratification model based on single curve;

[0170] g. Establish stratum stratification model based on multi-curve.

[0171] In the step a, the calculation process of finding the curve peak and trough is 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 peak A point conforms to one of two characteristics:

[0173] (1) X2 is negative at position j and positive at j-1 at the same time, then position j is the peak;

[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, ...

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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 the division of geological horizons in well logging interpretation and evaluation. Background technique [0002] In the process chain of well logging interpretation and evaluation, the division of geological horizons is a key step. 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 layers 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 horizons is affected by human factors, and the accumulation of experience requires a long working time. At the same time,...

Claims

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Application Information

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Patent Type & Authority Applications(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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