Method for predicting plane distribution law of effective natural fissures of oil reservoir

A natural fracture, plane distribution technology, applied in the field of natural fracture distribution research, can solve the problems of inability to make further understanding of natural fracture distribution, failure to consider reservoir stress release fracture density, failure to consider invalid fractures, etc.

Active Publication Date: 2013-09-25
PETROCHINA CO LTD
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Problems solved by technology

[0006] The finite element method predicts the plane distribution of fractures to fit the fracture density observed by the core, and the description of the fracture density observed by the core is carried out under ground conditions, without considering the influence of reservoir stress release on the fracture density, resulting in the fracture density predicted by this method The density distribution is too large; at the same time, due to the complex stress field distribution of the reservoir and the filling of natural

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  • Method for predicting plane distribution law of effective natural fissures of oil reservoir
  • Method for predicting plane distribution law of effective natural fissures of oil reservoir
  • Method for predicting plane distribution law of effective natural fissures of oil reservoir

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Embodiment 1

[0043] see figure 1 , an embodiment of the present invention provides a method for predicting the planar distribution of effective natural fractures in a reservoir, the method comprising:

[0044] Step 101: Preliminarily determine the characteristic parameters of natural fractures in ultra-low permeability tight oil reservoirs through conventional fracture identification and description techniques;

[0045] In the embodiment of the present invention, geological research techniques such as core observation, outcrop observation, and thin section observation are mainly used to obtain the characteristic parameters of natural fractures such as the extension length, density, opening, depth of cut, and azimuth distribution characteristics of natural fractures in the reservoir. Using modern fracture identification and description technology to understand the natural fractures of reservoirs, it provides a more comprehensive theoretical basis and data support for obtaining reliable dist...

Embodiment 2

[0063] Ultra-low permeability tight oil reservoir Chang 8 oil reservoir in Zhuang 9 well area is located in the middle of the Ordos Basin. The sedimentary microfacies are mainly underwater distributary channel microfacies, with an average porosity of 10.6% and an average permeability of 0.36mD. Mainly develop NE-trending and NW-trending high-angle structural fractures, the average linear density observed in the core is 1.4 fractures / m, the fracture opening is 10-40μm, the cutting depth is mainly 10.0-20.0cm, and the micro-fracture spacing is 10.0-40.0cm. Mainly, the extension length of fractures is between 3.0-12.0m; the plane distribution of fractures predicted by finite element method in Zhuang 9 well area is shown in Figure 4 , the maximum crack density is 2.0 cracks / m, and the average crack density is 1.2 cracks / m.

[0064] When the geological modeling of the reservoir without natural fractures is adopted in the Zhuang 9 block, the image 3 The method shown is used to fi...

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Abstract

The invention discloses a method for predicting the plane distribution law of the effective natural fissures of an oil reservoir and belongs to the field of natural fissure research. The method comprises the following steps: according to the conventional fissure recognition and description technologies, preliminarily determining the characteristic parameters of the natural fissures of the ultra-permeability dense oil reservoir; acquiring the preliminary distribution law of the natural fissures according to the finite element method; according to the characteristic parameters and the preliminary distribution law, building a reservoir-bed fissure geologic model; according to the sequence stratigraphy and the phase-controlled modeling technology, building a reservoir bed matrix geologic model; according to development conditions of the natural fissures in different matrixes, combining the reservoir bed fissure geologic model and the reservoir bed matrix geologic model and building a preliminary reservoir bed geologic model taking the natural fissures into consideration; on the basis of the preliminary reservoir bed geologic model taking the natural fissures into consideration, acquiring the plane distribution law of the effective natural fissures by adjusting the characteristic parameters to be fitted with production data. The method provides a reliable basis for optimizing a development technology policy.

Description

technical field [0001] The invention relates to the field of research on the distribution law of natural fractures in ultra-low-permeability tight oil reservoirs, in particular to a method for predicting the planar distribution law of effective natural fractures in ultra-low-permeability tight oil reservoirs. Background technique [0002] According to the Petroleum and Natural Gas Industry Standard of the People's Republic of China "Evaluation Method for Oil and Gas Reservoirs" (SY / T628521997) implemented in 1998, ultra-low permeability reservoirs refer to reservoirs with air measured permeability less than 1.0mD. There is no classification standard for oil reservoirs, and oil reservoirs with air permeability less than 1.0mD are usually defined as tight oil, so ultra-low permeability oil reservoirs are classified as tight oil. At present, the world petroleum industry has entered the era of equal emphasis on the development of conventional oil and tight oil resources, and the...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 樊建明赵继勇何永宏李书恒曾联波王杰陈文龙杨军侠
Owner PETROCHINA CO LTD
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