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Evaluation method for judging water-oil-gas distribution in petroleum and natural gas reservoir stratum

An oil and natural gas and evaluation method technology, which is applied in the field of evaluation for judging the distribution of oil, gas and water in oil and natural gas reservoirs, can solve problems such as misunderstandings by logging interpreters, and achieve unique technical advantages, high coincidence rate, and wide application range. Effect

Inactive Publication Date: 2014-07-30
CNPC BOHAI DRILLING ENG
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Problems solved by technology

However, the further judgment and determination of oil-water layers, oil-bearing water layers, and water layers in oil-gas-water reservoirs has always been a difficult point in mud logging interpretation and evaluation.
The previous practice is to comprehensively interpret and evaluate the oil-water layer, oil-bearing water layer and water layer by referring to the conclusion of oil testing of adjacent wells, combined with the non-hydrocarbon gas display of the interpreted well reservoir and the changes in drilling fluid conductivity, density, temperature and other parameters. , but these information, in addition to the conclusion of oil testing of adjacent wells, often lead mud logging interpreters into misunderstandings in the actual interpretation and evaluation process

Method used

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  • Evaluation method for judging water-oil-gas distribution in petroleum and natural gas reservoir stratum
  • Evaluation method for judging water-oil-gas distribution in petroleum and natural gas reservoir stratum
  • Evaluation method for judging water-oil-gas distribution in petroleum and natural gas reservoir stratum

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Embodiment 1

[0057] Located in the hinterland of Bohai Bay Basin, Qikou Sag is one of the largest oil-gas-rich sags in Bohai Bay Basin. The oil testing data and gas logging data of the corresponding layers in 9 oil testing intervals of 8 oil testing wells located in the Qikou Sag were extracted (see Table 2), and the interpretation chart was drawn using the hydrocarbon ratio knuckle method (see figure 2 ).

[0058] Table 2 Comparison table of oil testing data and corresponding gas logging hydrocarbon ratio and corresponding interpretation results

[0059]

[0060] Oil layer: CH33 well section 3610.00-3681.00m. The line connecting the dots of the hydrocarbon ratios (see Table 3) at the well depth of this well section is on the chart of the hydrocarbon ratio knuckle method (see image 3 ) distribution, all fall within the scope of the oil area, and the gas logging is interpreted as an oil layer. For the oil test of the 3611.40-3685.50m well section, 5 layers were shot and the thicknes...

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Abstract

The invention discloses an evaluation method for judging water-oil-gas distribution in a petroleum and natural gas reservoir stratum. A novel gas logging and gas interpretation and evaluation method which has certain application range and is prior to a Pixler method in the judgment of a gas reservoir, an oil reservoir, a water-oil reservoir and a water reservoir of the reservoir stratum is summarized according to three gas ratios, namely C2 / C1 (the ratio of ethane to methane), C3 / C1 (the ratio of propane to methane) and C4 / C1 (the ratio of butane to methane) by using statistic analysis of field gas logging and well completion oil testing data of a petroleum and natural gas exploration and development well. The evaluation method has the advantages of simpleness, practicality, higher coincidence rate and wide application range. Particularly, the evaluation method has unique technical advantages of quickly and accurately obtaining the characteristics of water, oil and gas contained in an underground reservoir stratum by drilling in the logging while drilling operation process of petroleum and natural gas exploration and development.

Description

technical field [0001] The invention relates to an evaluation method for judging the distribution of oil, gas and water in oil and gas reservoirs, specifically, it is a method for judging the fluid properties of reservoirs during the comprehensive logging or gas logging operations of oil and gas exploration and development. Intuitive and fast gas interpretation evaluation method. 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 identifying the oil content of the reservoir. However, further judgment and determination of oil-water layers, oil-bearing water layers, and water layers in oil-gas-water reservoirs has always been a difficult point in mud logging interpretation and evaluation. The previous practice is to comprehensively interpret and evaluate the oil-water layer, oil-bearing water layer and water layer by referring to the conc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 郭琼陶青龙宋庆彬刘永泉李艳徐利娟
Owner CNPC BOHAI DRILLING ENG
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