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A Classified and Quantitative Characterization Method for Microfractures in Fractured Tight Reservoirs

A technique for quantitative characterization of tight reservoirs, applied in the field of oil and gas resource exploration, can solve problems such as pores or fractures, deviation of test results, and inability to simply apply, and achieve the effect of enriching the evaluation system, easy operation, and strong practicability

Active Publication Date: 2018-05-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0006] Although the methods for characterizing microscopic pore structure characteristics can be used for reference in the study of microcracks, the above methods have certain limitations in the study of microcracks and cannot be simply applied. For example, when the pressure exceeds 70MPa, the mercury injection method will cause rock rupture and produce Pores or cracks, causing deviations in test results

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  • A Classified and Quantitative Characterization Method for Microfractures in Fractured Tight Reservoirs
  • A Classified and Quantitative Characterization Method for Microfractures in Fractured Tight Reservoirs
  • A Classified and Quantitative Characterization Method for Microfractures in Fractured Tight Reservoirs

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Embodiment Construction

[0048] The present invention takes the tight reservoir in the Liuhe Basin as an example, and describes the specific implementation plan and application effect in combination with the accompanying drawings and specific implementation modes.

[0049] Step 1: Observation of micro-crack development characteristics;

[0050] Through ordinary thin section and field emission scanning electron microscope, the fracture morphology, development characteristics and distribution rules were observed under the microscope.

[0051] The reservoir of Well Liucan 1 in the Liuhe Basin is relatively tight, and the overall pores are not developed, and calcite intercrystalline pores can be seen under the microscope (see figure 1 a), clay mineral intergranular pores (see figure 1 b) and the dissolution pores formed by the weak dissolution of feldspar (see figure 1 c), but the pores are mainly developed in the dense shallow layer with a buried depth of less than 1000m (see figure 1 ); micro-fractur...

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Abstract

The invention relates to the technical field of oil and gas resource exploration, in particular relates to method for grading and quantitative characterization of fractured tight reservoir microcracks, which comprises the following steps: (1) observing microcrack development characteristics; (2) quantitatively evaluating and characterizing nano-size cracks; and (3) quantitatively evaluating and characterizing micro-size cracks. The invention puts forward a method for quantitative characterization of fractured tight reservoir microcracks for the first time, which enriches the tight reservoir mechanism evaluation system of China. The method disclosed by the invention can conveniently and rapidly realize the identification, evaluation and characterization of micro-size and nano-size cracks to discover the contribution of cracks of different sizes on physical properties, so as to realize the grading and quantitative evaluation of fractured tight reservoirs. The method disclosed by the invention is convenient for operation and has strong feasibility of implementation, can well reveal the reservoir mechanism of unconventional reservoir microcracks, and takes a demonstration effect on the evaluation of the fractured tight reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil and gas resource exploration, in particular to a classification and quantitative characterization method for micro-fractures in fractured tight reservoirs. Background technique [0002] Micro-fractures in tight reservoirs are not only the main storage places for oil and gas, but also very important migration channels, especially for tight reservoirs such as tight sandstone and shale, micro-fractures can not only increase the effective porosity of tight reservoirs Moreover, the shape, direction, density and sealing of natural fractures have an important impact on well pattern deployment and fracturing, and are the key factors controlling the development effect of tight oil and gas reservoirs. [0003] The marine mud shale in southern my country is widely distributed, but due to its large buried depth and the impact of strong compaction, its pores are usually extremely dense, mostly nano-scale, which is...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/22G01N7/04
CPCG01N7/04G01N23/22
Inventor 李文浩卢双舫谭昭昭周能武何涛华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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