Tight oil characteristic discrimination method and chart board generation method

Abstract

The invention provides a tight oil characteristic discrimination method and a chart board generation method. The chart board generation method comprises that selecting a tight oil reservoir rock sample according to the distribution characteristic of tight oil, and measuring the effective porosity and the reservoir rock brittleness of the reservoir rock sample; selecting a tight oil enclosed coring sample, and measuring the initial oil saturation and the crude oil fluidity of the tight oil enclosed coring sample; selecting a typical coring oil well, and describing rock core cracks of the typical coring oil well; selecting a typical oil well, and measuring the tight oil initial formation pressure of the typical oil well; and establishing a tight oil characteristic discrimination chart board according to the above result. The invention also provides a method for determining the characteristic of the tight oil to be tested by means of the above tight oil characteristic discrimination chart board. By employing the tight oil characteristic discrimination method, the characteristic of the tight oil can be discriminated accurately and quickly, the characteristic of the tight oil can be explained comprehensively and reliably, and the characteristic difference between different tight oils can be known deeply.

Description

technical field [0001] The invention relates to a research technology for characteristics of tight oil in the development of unconventional oil and gas, in particular to a method for distinguishing characteristics of tight oil and a method for generating a chart, belonging to the technical field of petroleum exploitation. Background technique [0002] At present, the world has entered the era of rapid development of unconventional oil and gas development, and tight oil has become the most eye-catching unconventional oil resource in the world in recent years. In particular, the field of tight oil development represented by North America has made remarkable progress in recent years. Through the "horizontal well + volume fracturing + industrialization" model, industrial production has been realized, which has greatly reduced the dependence of oil and gas in the United States on foreign countries. China is rich in tight oil resources. Many reserves of 100 million tons have been ...

AI Technical Summary

Problems solved by technology

The advantage of the traditional discrimination method is that it provides an objective description of reservoir characteristics. However, tight oil in different regions may not only contain a variety of source-reservoir relationships and reservoir rock types, but also the size of effective reservoir space, crude oil properties, and original formation pressure. There are large differences in the reformability of rocks and rocks, and traditional methods cannot quickly, comprehensively and reliably understand the characteristics of tight oil.

[0004] Therefore, it is of great significance to provide a comprehensive and reliable identification method for tight oil properties and to clarify the differences in properties of different tight oils for formulating technical countermeasures for tight oil development. Currently, there is no identification method and chart for tight oil properties at home and abroad.

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