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A logging interpretation method for low-resistivity reservoirs in ultra-low permeability sandstone reservoirs

A technology for sandstone reservoir and logging interpretation, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of low identification accuracy, achieve good matching, reliable logging interpretation results, and improve accuracy Effect

Active Publication Date: 2019-11-12
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0006] Aiming at the disadvantage that the current logging interpretation is aimed at reservoirs with obvious oil-water layer differentiation, and when the oil-water differentiation is not obvious, the identification accuracy is low. layer interpretation method

Method used

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  • A logging interpretation method for low-resistivity reservoirs in ultra-low permeability sandstone reservoirs
  • A logging interpretation method for low-resistivity reservoirs in ultra-low permeability sandstone reservoirs
  • A logging interpretation method for low-resistivity reservoirs in ultra-low permeability sandstone reservoirs

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0042] The inventive method such as figure 1 As shown, by processing logging data and related geological data, a suitable method for determining the lower limit of physical properties and electrical properties of reservoirs is studied, and a logging interpretation method for low-resistivity reservoirs in ultra-low permeability sandstone reservoirs is summarized, as follows:

[0043] Step 1. Optimizing the logging series, wherein the lithology logging series uses natural potential and natural gamma ray logging series for identification and evaluation; the porosity logging series optimization uses density logging, acoustic time difference logging and neutron logging; Optimal selection of array induction logging, induction logging and R4.0 for rate logging series;

[0044] Step 2: Carry out core ho...

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Abstract

The invention discloses an ultra-low permeability sandstone reservoir low-resistivity reservoir well logging interpretation method and relates to the technical field of unconventional tight reservoir well logging interpretation evaluation. The interpretation method special for an ultra-low permeability sandstone reservoir low-resistivity reservoir is provided aiming at the defects that an existing well logging interpretation method is poor in adaptability to an oil-water poor-differentiation reservoir and low in interpretation accuracy and precision. According to the method, on the basis of relevant geological data and geological knowledge, by processing well logging information data and researching a proper method for determining the physical property lower limit and the electrical property lower limit of the reservoir, the ultra-low permeability sandstone reservoir low-resistivity reservoir well logging interpretation method is summarized; by means of the method, the accurate and reliable well logging interpretation result can be obtained, and well logging interpretation of the ultra-low permeability sandstone reservoir low-resistivity reservoir with the large reservoir oil-water resistivity difference and an obvious oil-water transition region can be achieved.

Description

technical field [0001] The invention relates to the technical field of logging interpretation and evaluation of unconventional tight reservoirs, in particular to logging secondary interpretation, in particular to a logging interpretation method for ultra-low permeability sandstone reservoirs and low resistance reservoirs. Background technique [0002] Well logging is a method of measuring geophysical parameters using the electrochemical properties, electrical conductivity, acoustic properties, radioactivity and other geophysical properties of rock formations. Generally, various physical parameters are obtained from well logging, such as resistivity and natural potential. , sound wave velocity, rock volume, density, etc., the above physical parameters can be collectively referred to as logging data, usually logging data cannot be directly applied to oil exploration operations, and the logging data obtained from logging can be directly applied to oil exploration operations The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 王瑞飞李开雷陈延军董凤娟
Owner XI'AN PETROLEUM UNIVERSITY
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