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Method for identifying property of fluid in fracture-cave type carbonate rock reservoir

A technology for carbonate reservoirs and fluid properties, which is applied in the logging of natural gas exploration and petroleum fields, can solve problems such as fluid property identification, and achieve remarkable application effects

Active Publication Date: 2012-06-20
PETROCHINA CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for identifying the fluid properties of fractured-vuggy carbonate reservoirs, so as to solve the problem of identifying fluid properties in fractured-vuggy carbonate reservoirs during oil and gas exploration

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  • Method for identifying property of fluid in fracture-cave type carbonate rock reservoir
  • Method for identifying property of fluid in fracture-cave type carbonate rock reservoir
  • Method for identifying property of fluid in fracture-cave type carbonate rock reservoir

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Embodiment Construction

[0043] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0044] Such as figure 1 As shown, the embodiment of the present invention provides a method for identifying fluid properties of fractured-cavity carbonate reservoirs, including the following steps:

[0045] (1) Obtain conventional logging data, formation water data and drilling fluid data;

[0046] (2) Calculating the shale content V of the well section containing mud sh and effective porosity Φ e ;

[0047] The shale content V of the well section containing mud sh and effective porosity Φ e is calculated by the density response equation of the multi-mineral group model, and the density response equation of the multi-mineral group model is:

[0048] ρ b = Σ i v i ρ mai ...

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PUM

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Abstract

The invention relates to a method for identifying the property of fluid in a fracture-cave type carbonate rock reservoir. The method comprises the following steps of: acquiring conventional well logging information, formation water information and drilling liquid information; calculating the mud content Vsh and the effective porosity phie of a mud-containing fracture-cave well section; calculating the resistivity subjected to mud influence removal of a full well section and the resistivity Rwai<*> of the visual formation water of the full well section; counting a mean value and a root-mean-square deviation of the resistivity of the visual formation water of a reservoir section to be identified; drawing the mean values and the root-mean-square deviations of the resistivities of the visual formation water of a plurality of reservoir sections, in which the quality of the fluid is determined, on a dual-logarithm coordinate, and establishing a fluid property judgment standard of a researchregion; comparing the mean value and the root-mean-square deviation of the resistivity of the visual formation water of the reservoir section to be identified with the established fluid property judgment standard of the research region, and judging the property of the fluid in the reservoir. According to the method, influence of well diameter expansion on the well logging information during valuing is avoided; and an aim of identifying the property of the fluid in the fracture-cave type carbonate rock reservoir is fulfilled.

Description

technical field [0001] The invention relates to well logging technology for oil and natural gas exploration, in particular to a method for identifying fluid properties of fracture-cavity carbonate rock reservoirs. Background technique [0002] In the process of oil and natural gas exploration, judging the fluid properties in the reservoir by using logging data is the main task of logging data evaluation. The current method for judging reservoir fluid properties is to introduce an index called saturation based on the empirical formula obtained from sandstone reservoirs - Archie's formula, to evaluate whether the fluid properties in the reservoir are oil and gas or formation by calculating the saturation value water. The basic problems with this traditional approach are: [0003] 1) This method cannot well eliminate the influence of the additional conductivity of mud on the calculation of saturation; [0004] 2) Existing methods are applicable to sandstone formations, but n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00G01N27/06
Inventor 王招明肖承文刘瑞林杨海军祁新忠张承森郭秀丽刘兴礼
Owner PETROCHINA CO LTD
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