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A method for dividing development units of low-permeability lithologic heterogeneous gas reservoirs

A heterogeneous and lithological technology, applied in earth-moving drilling, wellbore/well components, etc., can solve problems such as affecting development policies, blurred boundaries, and failure to consider production dynamic indicators, so as to prolong the stable production period and improve production. Yield effect

Active Publication Date: 2020-01-07
PETROCHINA CO LTD
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Problems solved by technology

[0003] The existing development units are mainly divided based on reservoirs. In the actual division process, geological parameters are mainly used as the main basis for division, and production dynamic indicators in the actual development process are not considered. Therefore, there is a certain deviation between the actual division results and the final actual conclusions , resulting in the blurring of the boundaries and affecting the formulation of development policies in the next step

Method used

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  • A method for dividing development units of low-permeability lithologic heterogeneous gas reservoirs
  • A method for dividing development units of low-permeability lithologic heterogeneous gas reservoirs
  • A method for dividing development units of low-permeability lithologic heterogeneous gas reservoirs

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Embodiment 1

[0044] According to the purpose and principle of gas reservoir development unit division, comprehensive geological, gas reservoir engineering and other data, multi-factor subdivided gas reservoir development unit, the basis of division mainly includes fluid properties, reservoir physical properties, production characteristics and other data to subdivide development units, This embodiment provides a method for dividing development units of low-permeability lithologic heterogeneous gas reservoirs, including the following steps:

[0045] Step 1, division of first-level development units: divide the low-permeability lithologic heterogeneous gas reservoir into multiple first-level development units according to the sedimentary facies characteristics of the reservoir and the distribution characteristics of the trench plane;

[0046] Step 2, division of secondary development units: detect the continuity characteristics of reservoir physical properties of each primary development unit,...

Embodiment 2

[0054] On the basis of Example 1, it should be noted that in step 1, the low-permeability lithology heterogeneous gas reservoir is divided into multiple first-level development units according to the distribution characteristics of reservoir sedimentary facies and trench planes, including Follow the steps below:

[0055] First, the gas field is divided vertically into two or more development blocks. The principle of division is that those with consistent sedimentary facies characteristics are divided into the same development block. The sedimentary facies characteristics include lithology, rock color, sedimentary structure, biogenesis and sediment particles;

[0056] Secondly, according to the planar orientation of the main trench during the deposition process, the overall development block formed in the previous step is cut horizontally to obtain multiple first-level development units.

[0057] This method mainly uses the lithology, rock color, sedimentary structure, biogenesis...

Embodiment 3

[0060] On the basis of Example 1, the physical property continuity characteristics of the reservoir in Step 2 include porosity, permeability, gas saturation and effective thickness. The specific division method of the secondary development unit is as follows:

[0061] First record the porosity of each well in the same development unit, and select several wells with continuous porosity values; then measure the permeability of these wells, and select several wells with continuous permeability values ; Measure the gas saturation of these wells again, and select several wells with continuous gas saturation values; finally measure the effective thickness of these wells, and select several wells with continuous effective thickness values wells, and the area where these wells are finally determined is the secondary development unit.

[0062] Since the physical properties of reservoirs in the same development unit are similar and have certain continuity, this method mainly uses the d...

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Abstract

The invention provides a method for classifying low-permeability lithologic non-homogeneous gas reservoir development blocks. Multi-factor subclassification of M gas reservoir development blocks is carried out by integrating geological and gas reservoir engineering data and the like according to the objectives and principles of classification of gas reservoir development blocks. Basis for development block subclassification mainly includes such data as fluid properties, reservoir physical properties, and production characteristics. The method is directed to classification of development blocks on the basis in multiple aspects such as dynamic reserve evaluation, production prediction, numerical simulation study, and the like, and on the basis of the classification of development blocks, fine dynamic evaluation study on gas reservoirs is carried out, which has important directive significance for prolonging the stable production period of a gas field and enhancing the recovery.

Description

technical field [0001] The invention belongs to the technical field of gas field development, and in particular relates to a method for dividing development units of low-permeability lithology heterogeneous gas reservoirs. Background technique [0002] Low-permeability lithologic gas reservoirs have a large gas-bearing area, a wide distribution range, and prominent reservoir heterogeneity. The entire gas reservoir cannot be developed as a whole by the same development method. It is necessary to divide the gas reservoir into multiple development units. Therefore, how to accurately divide a gas reservoir into development units is the key to improving the development effect of gas reservoirs. [0003] The existing development units are mainly divided based on reservoirs. In the actual division process, geological parameters are mainly used as the main basis for division, and production dynamic indicators in the actual development process are not considered. Therefore, there is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 何磊张明禄谭中国王东旭兰义飞袁继明张建国伍勇徐运动游良容艾庆琳谢姗田敏刘志军刘海锋夏勇何鎏费世祥
Owner PETROCHINA CO LTD
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