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Quantitative characterization method of gravel directionality in conglomerate core and application thereof

A quantitative characterization and directional technology, applied in special data processing applications, earthwork drilling, instruments, etc., can solve problems such as the inability to meet the fine description of conglomerate reservoirs, and the inability to finely classify sedimentary microfacies.

Active Publication Date: 2018-07-20
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing characterization methods include rose diagrams, histograms, and isopycnic diagrams. Although these methods can characterize the orientation characteristics of gravels on a certain basis, they cannot meet the requirements for fine description of conglomerate reservoirs and cannot be used for sedimentation. The fine division of microfacies provides the basis

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  • Quantitative characterization method of gravel directionality in conglomerate core and application thereof
  • Quantitative characterization method of gravel directionality in conglomerate core and application thereof
  • Quantitative characterization method of gravel directionality in conglomerate core and application thereof

Examples

Experimental program
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Embodiment 1

[0050] The rationality research of embodiment 1 quantitative characterization

[0051] Take conglomerate core sample A and sample B, and the partial structure diagram of sample A is as follows Figure 10 As shown, the partial structure diagram of sample B is shown in Figure 12 shown. Characterize according to the quantitative characterization method of gravel orientation in the conglomerate rock core of the present invention, obtain the rose diagram respectively as follows Figure 11 and Figure 13 As shown, the calculated parameter a and parameter σ are shown in Table 1:

[0052] Table 1: Quantitative characterization results of sample A and sample B

[0053]

parameter a

parameter σ

Orientation level

Sample A

42

6

Obvious orientation

Sample B

42

3.2

certain orientation

[0054] Depend on Figure 11 and Figure 13 It can be seen that there is a certain difference in the orientation of sample A and sample B, ...

Embodiment 2

[0058] Example 2 Classification of gravel orientation in Mahu area

[0059] The Baikouquan Formation in the Mahu area is a sandy-gravel fan-delta sedimentary system, in which a large set of conglomerate was deposited. The sedimentary structure is complex and difficult to identify on the core.

[0060] This embodiment selects the coring data of well M152 in this area as the object of statistical analysis, for selecting 82 rock core samples (rock core photos), and counts the directional statistical parameters a and σ of the gravel in each rock core, as shown in Table 2 .

[0061] Table 2. Statistical table of gravel orientation parameters in Well M152

[0062]

[0063]

[0064]

[0065]

[0066] It can be seen from Table 2 that there is a certain relationship between the grade of gravel orientation and the lithofacies of conglomerate. The rock facies contains parallel bedding (p) and cross bedding (x), and the orientation is better, which means that there is obvio...

Embodiment 3

[0068] Application of embodiment 3 gravel orientation in sedimentary facies analysis

[0069] The study horizon in this example is the second member of the Baikouquan Formation of the Triassic system, which is a set of near-source glutenite-based sedimentary bodies. Well FN16 is located at the lower left edge of the Xiazijie fan in the Mahu Sag of the Junggar Basin, and the sampling site (2771.4-2768.3m) is located in the upper part of the Baier Member. Mainly; the sedimentary structure is mainly cross-bedding and massive bedding; the rock color is gray-green and gray; the support mode is mainly grain support and multi-level grain support, lithofacies type: G 4 xgg I, G 3 mgg I, G 4 xg II, G 5 xg II, G 5 xg I, G 2 xg I, G 3 mggI, G 3 mg I.

[0070] This time, 11 sampling points were selected for coring, quantitative research was carried out on the orientation of the gravel of 11 samples, and the values ​​of the orientation parameters a and σ of the samples were calcu...

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Abstract

The invention relates to a quantitative characterization method for gravel directionality in a conglomerate core and application thereof. According to the quantitative characterization method, a parameter alpha and a parameter sigma are used for characterizing at the same time, the parameter alpha is the maximum value of the sum of the frequency values of three adjacent apparent dip intervals, andthe parameter sigma is calculated by a formula. The quantitative characterization method for the gravel directionality in the conglomerate core can be applied to sedimentary facies analysis. The quantitative characterization method is reliable and reasonable, can accurately characterize gravel directionality characteristics, distinguish gravel directionality differences among different samples, further help to identify sedimentary structures and sedimentary facies, and is very helpful for more accurate analysis of sedimentary hydrodynamic conditions of conglomerate.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and development, in particular to a method for quantitatively characterizing the orientation of gravel in a conglomerate core and its application. Background technique [0002] Non-three-dimensional equiaxed gravel (especially flat gravel) will be oriented in order to maintain its most stable arrangement state under the action of flowing water or gravity. Under different depositional conditions, the orientation characteristics of gravel will be different. For example, in river deposits, there will be gravel imbricate structures, and the orientation of gravel is very good. In debris flow deposition, the orientation of gravel is disordered. [0003] The understanding and research on the orientation of gravel originated from imbricate structures in the field. In the 1930s and 1940s, some sedimentologists at home and abroad did a lot of work on the orientation of gravel and formed a ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G06F17/50
CPCE21B49/00G06F30/20
Inventor 黄远光张昌民丁雲朱锐袁瑞瞿建华唐勇安志渊
Owner YANGTZE UNIVERSITY
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