Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A shear wave velocity prediction method suitable for low porosity sand-shale formations

A technology of shear wave velocity and low porosity, which is applied in seismology for well logging and other fields, and can solve the problems of poor shear wave prediction effect and low permeability in small porosity intervals

Inactive Publication Date: 2016-08-03
CHENGDU UNIVERSITY OF TECHNOLOGY
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] The purpose of the present invention is to provide a method for predicting shear wave velocity for low-porosity sand-mudstone formations, which solves the problem that the prior art does not carry out low-porosity, low-permeability, and low-abundance three-low characteristic gas fields. Dealing with the problem that the prediction effect of shear waves in small-pore intervals is poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A shear wave velocity prediction method suitable for low porosity sand-shale formations
  • A shear wave velocity prediction method suitable for low porosity sand-shale formations
  • A shear wave velocity prediction method suitable for low porosity sand-shale formations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0075] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0076] The existing gas field type, its reservoir is composed of meandering river sand bar and delta plain distributary channel sand body, which has the characteristics of "three lows" of low porosity, low permeability and low abundance, and the pore types are complex and changeable. The sand bodies are superimposed on each other, the lithology changes rapidly laterally, and the heterogeneity is strong. Based on the above characteristics of this type of gas field, the present invention provides a new shear wave inversion method suitable for this type of area, which can effectively improve the accuracy and reliability of shear wave prediction for this type of gas field.

[0077] The new shear wave prediction method proposed by the present invention denoises the original well logging curve (filtering by median filter method) before calculation,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a novel shear wave velocity prediction method for a low-porosity sand shale stratum. The method includes the steps that firstly, logging parameters of a reservoir stratum section are input, and one-dimensional median filtering processing is conducted on actually measured longitudinal wave data; according to the size of porosity of a current depth point, the initial shear wave velocity of a small-porosity stratum section, the initial shear wave velocity of a large-porosity stratum section and the initial shear wave velocity of a middle-porosity stratum section are respectively calculated; according to the initial shear wave velocities, a firstly-predicted initial shear wave velocity is calculated through back calculation; the firstly-predicted initial shear wave velocity serves as initial shear wave velocities, the back calculation process is repeated so that back calculation accuracy is improved, and then the finally-predicted shear wave velocity is acquired and recorded; the predicted shear wave velocity of each logging depth point of the reservoir stratum section can be acquired until all the logging points are calculated. The method has the advantage that the shear wave velocity prediction effect of the small-porosity stratum section is good.

Description

technical field [0001] The invention belongs to the technical field of logging shear wave velocity inversion, and relates to a shear wave velocity prediction method suitable for low-porosity sand-shale formations. Background technique [0002] (1) Seismic shear wave: shear wave is a wave in which the forward direction of the seismic wave is perpendicular to the vibration direction of the particle. The shear wave has its inherent advantages in judging lithology, fractures and oil and gas. [0003] (2) Shear wave prediction: predict (or estimate) the shear wave data of the target well or other wells based on known logging data or other data of the target well or other wells. [0004] (3) Pore structure: refers to the geometric shape, size, distribution, connectivity and configuration relationship between pores and throats of rocks. [0005] (4) Logging curve: the formations around the wellbore are tested by various logging instruments, and the curves of parameters such as lit...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/40
Inventor 熊晓军林华伟张珊珊
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com