Judgment method for oil-water layer

A determination method and technology of oil and water layers, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as not being able to meet fine exploration and development, and have a large impact, so as to make up for the limitations of the identification method, expand the scope of parameter response, and provide reliable support Effect

Active Publication Date: 2017-02-22
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] At present, rock pyrolysis gas chromatography mainly uses the comparison method of spectrogram morphology to identify oil and water layers. Although it has the characteristics of intuitiveness and quick interpretation and evaluation, the standard spectrogram pattern is defined in a non-quantitative way, and the results are greatly affected by human factors. Cannot meet the needs of fine exploration and development

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  • Judgment method for oil-water layer
  • Judgment method for oil-water layer
  • Judgment method for oil-water layer

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Embodiment 1

[0073] The Baxian Sag is located in the hinterland of the Bohai Bay Basin, and is one of the oil-gas-rich sags in the Bohai Bay Basin. The oil testing data and pyrolysis gas chromatographic data of the corresponding layers in 15 oil testing intervals of 7 oil testing wells located in the Baxian sag were extracted, as shown in Table 2, and the interpretation chart was drawn by using the characteristic parameter interpretation method, as shown in figure 2 , image 3 with Figure 4 As shown, the oil testing conclusions are oil layers, oil-water layers, and oil-bearing water layer reservoirs, and the pyrolysis chromatographic parameter fold lines are clearly divided on the chart.

[0074] Reservoir: Well C514x well section 2409.0-2415.0m. Coring pyrolysis gas chromatography parameters (see Table 2) of this well section are on the explanatory drawing board (see Table 2) Figure 5 ) distribution, all fall within the scope of the oil area, which is interpreted as an oil layer. A...

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Abstract

The invention provides a judgment method for an oil-water layer. The judgment method comprises the following steps of: I. defining an oil-gas display layer according to the information of rock debris, rock cores, sidewall coring and gas logging; II. Analyzing samples, to obtain the relative percentage composition of C8-C37 n=alkanes, Pr and Ph; III. Calculating the ratio of Pr/C17, Ph/C18, delta C21-/delta C22+, C21+C22/C28_C29 parameters; IV. drawing a parameter ratio broken link graph; and V. determining the reservoir fluid property according to the positions of shaft plumpings of a Pr/C17, Ph/C18, delta C21-/delta C22+, C21+C22/C28_C29 on a rock pyrolysis gas chromatorgraphic parameter drawing board. According to the judgment method, the parameter application range can be extended, the change condition of longitudinal fluid property of reservoir can be objectively reflected, and the interpretation coincidence rate of the logging oil-water layer can be increased.

Description

technical field [0001] The invention belongs to the technical field of interpretation and evaluation of oil and gas layers, and in particular relates to a method for judging oil and water layers. Background technique [0002] In the comprehensive interpretation and evaluation of mud logging, it is particularly important to effectively identify the water content of the reservoir while evaluating the oiliness of the reservoir. difficulty. [0003] Rock pyrolysis gas chromatography analysis technology detects hydrocarbons in the reservoir, and can obtain the relative percentage content, peak area, retention time and relative percentage content of pylane and phytane of C8-C37 monomeric hydrocarbons. These monomeric hydrocarbons are calculated, and in turn a number of derived parameters can be obtained. The principle of identifying the water content of the reservoir is: when the reservoir is oil-water miscible, the water contains a certain amount of oxygen and bacteria. The st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/12
CPCG01N30/02G01N30/12G01N2030/125
Inventor 张玉新姜维寨李毅逵宋义民孟庆峰候玉花张秀峰张海娜吴颖
Owner BC P INC CHINA NAT PETROLEUM CORP
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