A comprehensive identification method of metamorphic rock lithology based on composition-structure classification
A method of discriminating metamorphic rocks, applied in seismology for well logging records, nuclear radiation exploration, electric/magnetic exploration, etc., can solve the problems of difficult rock composition naming and differences in geological naming, and achieve accurate The effect of high rate, improved accuracy rate and good effect
Active Publication Date: 2020-09-18
CHINA NAT OFFSHORE OIL CORP +1
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However, the naming of metamorphic rock lithology is controlled by the rock composition and its structure, and it is difficult to obtain an accurate name only by determining the rock composition. For example, the banded mixed gneiss and the eyeball mixed gneiss are similar in composition, both of which are biotite , quartz, plagioclase and potassium feldspar, and the content is similar, but due to their different structures, the geological names are obviously different, so it is difficult to obtain accurate results by only considering the rock composition for lithology identification
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[0035] A method for comprehensively discriminating metamorphic rock lithology based on composition-structure classification of the present invention will be described in detail below with reference to the examples and accompanying drawings.
[0036] A metamorphic rock lithology comprehensive identification method based on composition-structure classification of the present invention, on the basis of composition identification, introduces the structure parameter of structural heterogeneity index, and utilizes imaging logging in structure identification Advantages, constrained structure identification results, respectively established lithology composition and structure discrimination standards, further improved the idea of metamorphic rock lithology identification, enriched the application of data, greatly improved the accuracy of lithology interpretation, and achieved good results in practical applications Effect.
[0037] Such as figure 1 As shown, a kind of metamorphic ro...
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The invention discloses a metamorphic rock lithology comprehensive judgment method based on component-structure classification. The method comprises the steps of establishing a metamorphic rock component-structure well logging geology classification table; integrating well logging data, namely, establishing conventional well logging and imaging well logging databases, and integrating the well logging data in the databases; establishing lithology component and structure quantitative judgment standards of metamorphic rocks; and carrying out component and structure identification on a well section of which rock lithology needs to be identified, comparing identification results with a component and structure classification table, and finally obtaining rock lithology. According to the method, structure identification precision is ensured, the lithology is explained, a lithology explanation accuracy rate is greatly improved, the method has the advantages of economy and high accuracy rate, and a good effect is achieved in practical application.
Description
technical field [0001] The invention relates to a method for comprehensively discriminating metamorphic rock lithology. In particular, it relates to a comprehensive identification method of metamorphic rock lithology based on composition-structure classification. Background technique [0002] Metamorphic rocks can be used as important oil and gas reservoirs, and a large number of oil and gas discoveries have been obtained (Huang Baogang et al., 2011; Wang Yonggang, 2012; Wu Zhiyong et al., 2001). The lithology of metamorphic rocks plays an important role in controlling the formation of high-quality reservoirs (Zhou Xinhuai et al., 2005; Song Borong et al., 2011). The difference in lithology controls the development degree of fractures and the ability of mineral dissolution to form reservoirs, thus strengthening the lithology Identification has important practical significance for oilfield exploration and development. [0003] Abundant oil and gas discoveries have been made...
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IPC IPC(8): G01V1/50G01V3/38G01V5/04
Inventor叶涛韦阿娟王德英王粤川高坤顺赵志平郭颖孙哲陈心路
OwnerCHINA NAT OFFSHORE OIL CORP