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A Method for Identifying Oil-bearing Characteristics of Gas Reservoirs Using Hydrocarbon Ratio Curve

A gas reservoir oil-to-hydrocarbon ratio technology, applied in earthwork drilling and production, wellbore/well components, etc., can solve problems such as oil-bearing characteristics of undiscovered gas reservoirs, and achieve the effect of simple discrimination method and easy data acquisition

Active Publication Date: 2015-12-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Claims
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Problems solved by technology

[0004] After searching, the above schemes are usually used to identify the oil and gas characteristics of gas reservoirs in the prior art, but no hydrocarbon ratio curve has been found to identify the oil-bearing characteristics of gas reservoirs.

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  • A Method for Identifying Oil-bearing Characteristics of Gas Reservoirs Using Hydrocarbon Ratio Curve
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  • A Method for Identifying Oil-bearing Characteristics of Gas Reservoirs Using Hydrocarbon Ratio Curve

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Embodiment Construction

[0028] refer to Figure 1-Figure 3 , the invention discloses a method for identifying the oil-bearing characteristics of a gas reservoir using a hydrocarbon ratio curve, comprising the following steps:

[0029] a. Collect late arrival database and formation stratification data of single well;

[0030] b. According to the lateness database, calculate the lateness corresponding to the full meter well depth (C 3 +iC 4 +nC 4 +iC 5 +nC 5 ) / C 2 curve value;

[0031] c. Will be late to the full meter well depth and (C 3 +iC 4 +nC 4 +iC 5 +nC 5 ) / C 2 Make a hydrocarbon ratio curve, such as figure 2 shown;

[0032] d. Determine the top and bottom well depths of the reservoir according to stratum stratification data;

[0033] e. Combining stratigraphic stratification data and hydrocarbon ratio curve, with the deepening of the well depth, if (C 3 +iC 4 +nC 4 +iC 5 +nC 5 ) / C 2 The value of the curve is relative to the initial stage of entering the reservoir (C 3 +iC...

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Abstract

The invention discloses a method for distinguishing gas reservoir oil-bearing feature through a hydrocarbon ratio curve. The method includes the steps of: a, collecting the late data bases and the strata hierarchical data of a single well; b, calculating the corresponding curve value (C3+iC4+nC4+iC5+nC5) / 2 of an integer number of well depth (in meter) according to the late data base; c, making a hydrocarbon ratio curve from the late integer number of well depth and (C3+iC4+nC4+iC5+nC5) / 2; d, determining the top well depth and the bottom well depth of the reservoir according to the strata hierarchical data; and e, distinguishing the oil-bearing feature according to strata hierarchical data in combination with hydrocarbon ratio curve. According to the method, the data is easily available and the hydrocarbon ratio curve can be drawn according to the late data base and the strata hierarchical data. The method is simple and can quickly and effectively judge whether the gas reservoir bears oil or not.

Description

technical field [0001] The invention relates to the application field of gas measurement data in the petroleum industry. Through processing the gas measurement data, the property of reservoir fluid can be known more objectively and truly. Background technique [0002] In the process of natural gas exploration and development, gas survey charts are often used to judge the fluid properties of reservoirs, that is, the fluid properties are judged by the gas area, gas-water area, and water area divided by the chart. However, practice has proved that some oil test results are oil and gas co-production The gas logging data of condensate gas reservoirs will also fall in the water area of ​​the chart. Therefore, it is necessary to find a way to judge whether the gas reservoir fluid contains oil, which will help to more truly reflect the properties of the reservoir fluid. [0003] The publication number is CN101520517, and the publication date is the Chinese patent literature on Septe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 杨琳唐家琼刘达贵邓月锐胡顺庆罗芳李旭景静
Owner BC P INC CHINA NAT PETROLEUM CORP
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