Division and evaluation method for fracture and hole type reservoir flow units

A technology of flow unit and evaluation method, applied in the field of oil and gas field exploration

Active Publication Date: 2014-11-19
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

[0005] The main purpose of the embodiments of the present invention is to provide a method for dividing and evaluating flow units in fractured-cavity reservoirs, so as to solve the above problems existing in existing methods for dividing and evaluating flow units

Method used

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  • Division and evaluation method for fracture and hole type reservoir flow units
  • Division and evaluation method for fracture and hole type reservoir flow units
  • Division and evaluation method for fracture and hole type reservoir flow units

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Embodiment 1

[0072] In this example, a fractured-cavity unit in Tahe Oilfield is taken as an example to divide flow units and evaluate each type of flow unit in the test area of ​​fractured-cavity reservoirs. Figure 2-7 Be explained:

[0073] (1) Based on the fractal theory, calculate the rate of change of the Hurst exponent, combine the drilling and logging information to count the reservoir physical properties of each well point, and divide the flow unit types of the downhole reservoirs in the test area, as shown in figure 2 ;

[0074] (2) Count the weighted average porosity of Jingchuan underground reservoir for the flow units of karst-cavity flow type, fracture-cavity flow type and fracture-hole flow type respectively, and determine the statistical results as the corresponding flow units in the entire test area Types of uniform standards, such as image 3 ;

[0075] (3) to image 3 The unified standard shown divides the test area into four flow units, namely, the flow unit of kar...

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Abstract

The invention provides a division and evaluation method for fracture and hole type reservoir flow units. The division and evaluation method for the fracture and hole type reservoir flow units comprises the steps that the standards for dividing flow unit types in an underground reservoir body are determined according to the changing rate of the hurst index after water appears in an oil well and the storage characteristics of the underground reservoir body of a fracture and hole type reservoir; the statistical result of weighted average porosity of the underground reservoir body of all the flow unit types is used as the unified standard for dividing the flow unit types, and the flow unit type division on a whole fracture and hole type reservoir area is carried out by utilizing the unified standard; characteristic parameters reflecting oil well productivity contribution are selected according to flowing laws of fluid of each flow unit type, and the flow units belonging to the corresponding flow unit types are evaluated by utilizing the characteristic parameters. According to the division and evaluation method for the fracture and hole type reservoir flow units, the fact that the units with identical storage characteristics and the flowing laws of the fluid can be divided as the same flow unit is facilitated, the evaluation standard is beneficial for forming efficient developing modes aiming at different flow units for researching the distribution characteristics of remaining oil.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploration, in particular to a method for dividing and evaluating flow units of fracture-cavity reservoirs. Background technique [0002] At present, a relatively complete fracture-vuggy unit division system has been formed for Tahe fracture-vuggy reservoirs. The fracture-vuggy unit is the basic unit for the development of fracture-vuggy reservoirs. Carbonate reservoirs, but due to the strong heterogeneity of fracture-vuggy media, the storage characteristics and oil-water flow laws of reservoirs in the same fracture-vuggy unit are very different. Therefore, it is necessary to deeply analyze the flow units inside the fracture-vuggy unit (that is, units with the same storage characteristics and fluid flow rules), to understand the fluid flow characteristics of different flow units in fracture-vuggy reservoirs, to recognize the static characteristics of the reservoir, and to evaluate oil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/00
Inventor 刘慧卿杨阳王敬张兆祥卢川王长久
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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