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A method for establishing the saturation model of fractured-cavity reservoirs based on pore type subdivision

A technology of model establishment and saturation, applied in the field of geological exploration, can solve the problems of lack of research and verification of real conductive mechanism, achieve the effect of improving fluid identification ability and logging interpretation accuracy, and improving logging saturation evaluation

Active Publication Date: 2022-06-07
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the use of series and parallel methods to equivalent the real conductive network of the formation lacks the research and verification of the real conductive mechanism.

Method used

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  • A method for establishing the saturation model of fractured-cavity reservoirs based on pore type subdivision
  • A method for establishing the saturation model of fractured-cavity reservoirs based on pore type subdivision
  • A method for establishing the saturation model of fractured-cavity reservoirs based on pore type subdivision

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Embodiment 1

[0151] Taking the case well Z of a certain oilfield in China as an example, the saturation model proposed based on pore type subdivision for 3260m-3300m carbonate fracture-cave reservoirs, figure 1 A flow chart is proposed for the saturation model based on pore type subdivision, a method for establishing a fracture-cavity reservoir saturation model based on pore type subdivision, which includes the following steps:

[0152] Step 1: Subdivision of pore types in fracture-cavity reservoirs, including the following steps:

[0153] According to the electrical imaging data of the study interval, the mercury intrusion data of the core and the two-dimensional image of the core, the main types of pores developed in the study interval (such as figure 2 ).

[0154] from figure 2 A black sine curve can be seen in (a), indicating the development of fractures in the study interval;

[0155] figure 2 (b) There is an obvious step in the mercury intrusion curve. First of all, at a lower...

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Abstract

The invention provides a fracture-vuggy reservoir saturation model establishment method based on pore type subdivision, comprising the following steps, step 1: determining the pore type of the fracture-vuggy reservoir; step 2: based on the pores in the fracture-vuggy reservoir type, analyze the saturation model; step 3: establish a saturation model of fracture-vuggy reservoir; step 4: determine the parameters of the saturation model; step 5: perform saturation calculation according to the saturation model and saturation parameters. The invention solves the problem of large variation range (inapplicability) of the porosity index m and the saturation index n in the saturation model of the anisotropic reservoir in the prior art.

Description

technical field [0001] The invention belongs to the field of geological exploration, and particularly relates to a method for establishing a fracture-cavity reservoir saturation model based on pore type subdivision. Background technique [0002] Saturation evaluation is the core of quantitative evaluation of oil and gas reservoirs. How to improve the calculation accuracy of reservoir water saturation has always been a difficult point in reservoir logging evaluation. Due to the complexity of the pore structure, the multiplicity of the reservoir space, and the extremely inhomogeneous random distribution, the fracture-cave reservoirs lead to strong heterogeneity of the reservoirs, which makes the reservoirs built on the basis of homogeneous and isotropic strata. The traditional logging interpretation method of , is obviously inapplicable, the reason is that the strong heterogeneity leads to a larger variation range of the porosity index m_ex and the saturation index n_ex in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/00
CPCG06T17/00Y02A90/30
Inventor 王海涛赖富强苏俊磊黄兆辉王敏刘源琦蒋国强张晓树夏小雪刘粤蛟臧永钤欧发辉
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY