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Representation method for rich organic matter mud rock sedimentary structure

An organic-rich and organic-matter technology, applied in the field of organic-rich mudstone geological exploration and evaluation design, can solve the problems of limitations and high coring costs, and achieve the effect of reducing the cost of characterization

Active Publication Date: 2014-11-12
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology

[0003] However, at present, the characterization method of underground organic-rich mudstone structure is mainly obtained by core observation. Due to the high cost of coring, the lack of coring layers, and the influence of subjective factors on the accuracy of core observation, the understanding of underground organic-rich mudstone structure is limited. Therefore, how to find an economical and quick way to characterize the structural characteristics of organic-rich mudstone has a wide range of scientific research and industrial application value

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  • Representation method for rich organic matter mud rock sedimentary structure
  • Representation method for rich organic matter mud rock sedimentary structure
  • Representation method for rich organic matter mud rock sedimentary structure

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Embodiment 1

[0029] Taking Well Zhaotong 4 as an example, the characterization method for the organic-rich mudstone structure of the whole well is as follows:

[0030] (A) Using conventional mud logging data and conventional logging data to identify the low organic matter mudstone interval in Well Zhaotong 4;

[0031] (A1) Identify silty mudstone by using the conventional mud logging data map: According to the conventional mud logging data map of Well Zhaotong 4 in the study area, the section with siltstone and silty mudstone is defined as silty mudstone section. Three sections of silty mudstone sections were identified, mainly including: 1889m-1892m, 1994m-1996m, 2001m-2044m;

[0032] (A2) Carry out equidistant sampling in rock core, and carry out whole rock analysis to sampling point, obtain the calcium salt content of sampling point, according to linear regression, obtain the coefficient in the calculation formula of calcium salt content: Calcium salt content=-0.940×SP+ 0.016×LLD-1.95...

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Abstract

The invention relates to the technical field of rich organic matter mud rock geological exploration and evaluation design, in particular to a representation method for a rich organic matter mud rock sedimentary structure. The method comprises the following steps that firstly, a rich organic matter mud rock section and a low organic matter mud rock section are analyzed and divided through mud logging data and log data; secondly, core data are observed, and layering sampling is carried out to prepare a sheet to determine the depth range; thirdly, the depth range obtained through the above steps is combined with the change frequency to obtain a maximum value and a minimum value; fourthly, after the maximum value and the minimum value are added together, the average value is worked out to serve as the dividing line value of a lamellar mud rock development section and a block mud rock development section; fifthly, the changing frequency of log data of full well section imaging is observed, the section with the changing frequency larger than the dividing line value is the lamellar mud rock development section, and the section with the changing frequency smaller than the dividing line value is the block mud rock development section. According to the representation method, a whole set of accurate recognition technology for the underground mud rock mass bedding structure is formed, sectional coring is not needed, and the representation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of organic-rich mudstone geological exploration and evaluation design, in particular to a characterization method of organic-rich mudstone sedimentary structure. Background technique [0002] The structural characteristics of organic-rich mudstone are closely related to their depositional environment. These organic-rich intervals are not only an important source of solid combustible minerals in my country, but also important source rocks for many large gas fields in my country. It is of great significance to study the scientific mechanism and guide the exploration and development of oil and natural gas. [0003] However, at present, the characterization method of underground organic-rich mudstone structure is mainly obtained by core observation. Due to the high cost of coring, the lack of coring layers, and the influence of subjective factors on the accuracy of core observation, the understanding of undergrou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 张元福张海波姜在兴王志峰胡晨林
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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