Method for applying dependent variables to calculate porosity of brittle formation

A technology of stratum porosity and strain, applied in calculation, special data processing application, earthwork drilling and production, etc., can solve the problem of inability to quantitatively calculate fracture parameters, etc.

Active Publication Date: 2016-03-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the method of obtaining formation strain through three-dimensional structure restoration can only describe fracture development and formation porosity and permeability qualitatively, but cannot quantitatively calculate fracture parameters such as fracture porosity. The method of obtaining fracture porosity through strain not yet reported

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  • Method for applying dependent variables to calculate porosity of brittle formation
  • Method for applying dependent variables to calculate porosity of brittle formation
  • Method for applying dependent variables to calculate porosity of brittle formation

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Embodiment Construction

[0094] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following is combined with the implementation of the appended Figure 1-6 , the present invention will be described in further detail. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0095] Step 1. By analyzing the geological background of the area where the brittle formation is located, determine the main geological period for the development of fractures in the brittle formation, and use 3D seismic data and drilling and logging data to make synthetic seismic records to determine the main geological period for the development of fractures in the brittle formation. Corresponding strata and brittle strata corresponding to the same axis on the seismic data volume, track and interpret them to obtain the time-domain horizon data (assuming that t...

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Abstract

The invention provides a method for applying dependent variables to calculate porosity of a brittle formation. The method comprises following steps: firstly, making structural interpretations about brittle formations and tomography; applying interpretation data to set up a geologic model in a depth domain; adopting a three-dimensional structural recovery method to calculate accumulative dependent variables of the brittle formation; utilizing a drilling and coring test to solve rock elasticity parameters of the brittle formation; calculate porosity of the brittle formation based on the set dependent variables-rock elasticity parameters-fracture porosity relations; applying core porosity to make corrections and compiling a horizontal distribution graph of porosity. Method for applying dependent variables to calculate porosity of the brittle formation helps to increase accuracy of porosity of the brittle formation and is easily and conveniently used and is well applied to increase of success rate of oil and gas reservoir, drilling and exploitation, avoidance of construction risks and improvement of efficiency.

Description

technical field [0001] The invention relates to the field of oil and gas geological exploration and processing methods, in particular to a method for calculating the porosity of brittle formations by using strain variables. Background technique [0002] A large number of exploration practices have shown that the pores and fractures in brittle formations are the main channels and storage spaces for oil and gas seepage, so the porosity of formations is closely related to this type of reservoirs. Scholars at home and abroad have made many explorations on the calculation of formation porosity, and the methods can be roughly divided into three categories, namely, the porosity calculation method based on well logging, the calculation method based on seismic and geological statistics, and the porosity calculation method based on tectonic origin. degree calculation method. There are two ways to calculate fracture porosity based on well logging. One is to use dual laterolog data to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G06F17/50
Inventor 韩波韩宏伟孙明江李国栋马玉歌孙金磊
Owner CHINA PETROLEUM & CHEM CORP
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