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A gas measurement and evaluation method for low gas-oil ratio reservoirs

An evaluation method and technology of gas-oil ratio, applied in earthwork drilling and production, wellbore/well components, etc., can solve problems such as difficulty in meeting interpretation requirements, increased exploration costs, and low overall compliance rate

Active Publication Date: 2019-11-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, in view of the particularity and concealment of the reservoir, although this interpretation method is intuitive, the overall coincidence rate is low, which is difficult to meet the interpretation requirements and virtually increases the exploration cost

Method used

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  • A gas measurement and evaluation method for low gas-oil ratio reservoirs
  • A gas measurement and evaluation method for low gas-oil ratio reservoirs
  • A gas measurement and evaluation method for low gas-oil ratio reservoirs

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Embodiment Construction

[0071] The technical solution of the present invention includes the following steps.

[0072] Step 1 Obtain oil well data: collect on-site gas testing data and oil testing data.

[0073] Step 2 parameter quality control: establish a gas measurement quality control curve template, such as figure 1 shown. figure 1 middle,

[0074] C1 is methane, C2 is ethane, C3 is propane, iC4 is isobutane, and nC4 is normal butane.

[0075] Full hydrocarbon: full hydrocarbon=C1+C2+C3+nC4+iC4+nC5+iC5.

[0076] Heavy hydrocarbons: heavy hydrocarbons=C2+C3+nC4+iC4+nC5+iC5.

[0077] Humidity ratio: Wh=(C2+C3+nC4+iC4+nC5+iC5) / (C1+C2+C3+nC4+iC4+nC5+iC5).

[0078] Balance ratio: Bh=(C1+C2) / (C3+nC4+iC4+nC5+iC5).

[0079] Quality control curve value: R Q =(C1+C2+C3+C4+C5) / (C1+2C2+3C3+4C4+5C5).

[0080] Import the gas logging data into the quality control curve template, and the quality control curve template will automatically calculate the quality control ratio range based on the gas logging...

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Abstract

The invention relates to the technical field of oil development oil reservoir engineering, in particular to a low gas-oil-ratio oil reservoir gas logging evaluation method. By adoption of the low gas-oil-ratio oil reservoir gas logging evaluation method, the problems that the interpretation coincidence rate is low, understanding of oil and gas reservoirs is not clear, and oil-water relation analysis is unknown during exploration and development are solved, and the exploration effect is improved. The low gas-oil-ratio oil reservoir gas logging evaluation method comprises the following steps that firstly, oil well data are obtained; secondly, parameter quality is controlled, specifically, a gas logging quality control curve template is established, gas logging data are input into the quality control curve template, and the gas logging data with the quality control ratio being within the range of 0.8-2.0 are selected to serve as analysis data meeting quality requirements; thirdly, parameters are selected, specifically, a relation between the gas logging data and an oil-water-gas layer is discovered through a grey correlation degree analysis method; and fourthly, the parameter research and oil reservoir gas logging evaluation method is established. A two-dimensional linear crossplot-gas logging interpretation chart is established, and different interpretation conclusion ranges are marked out.

Description

technical field [0001] The invention relates to the technical field of oil development reservoir engineering, in particular to a gas measurement and evaluation method for reservoirs with low gas-oil ratio. Background technique [0002] The Ordos Basin of Changqing Oilfield is a typical "three-low" oil and gas field with low permeability, low pressure and low abundance. Due to the lack of mud logging technical support in the early stage, the understanding of oil and gas reservoirs and the analysis of oil-water relationship are unclear, which affects the exploration effect. In particular, the Jurassic Yan'an Formation is a low gas-oil ratio reservoir, which brings great difficulties to interpretation and evaluation. [0003] At present, there are two commonly used technical means: one is to analyze the parameters of well logging curves. Because the relationship between well logging curves and oil-water layers in the three-low area is not well responded, the interpretation coin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 陈志伟刘应忠陈光权骆福贵李忠亮吴彩雄王春辉杜鹏
Owner BC P INC CHINA NAT PETROLEUM CORP
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