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Metamorphic rock lithology identification method

A technology for lithology identification and metamorphic rock, which is applied in the field of logging interpretation and can solve the problems of no discrimination criteria and no consideration of the relationship between metamorphic rocks and so on.

Inactive Publication Date: 2013-01-02
CNPC GREATWALL DRILLING ENG
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Problems solved by technology

This method is relatively simple, does not consider the relationship between the main structural minerals in metamorphic rocks, and has no certain criteria for discrimination. It can only rely on the lithology of metamorphic rocks analyzed by experimental cores to calibrate the areas where different lithologies are located on the intersection map

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  • Metamorphic rock lithology identification method
  • Metamorphic rock lithology identification method
  • Metamorphic rock lithology identification method

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing:

[0012] Such as figure 1 Shown, the present invention is a kind of metamorphic rock lithology identification method, it is characterized in that: comprise the following steps:

[0013] (1) Use the M-N value of the logging response of the main components of metamorphic rocks to make an M-N intersection chart and analyze the metamorphic rock series;

[0014] (2) Calculate the M-N value from the log curve value, and make a crossplot with this value in the metamorphic rock section, and compare it with the chart; the formula for calculating the M-N value is:

[0015] M = 0.01 ( Δt f - Δt ρ b - ρ ...

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Abstract

The invention discloses a metamorphic rock lithology identification method, and relates to the field of log interpretation. The method is as follows: a relationship of a metamorphic rock type and main component minerals can be studied based on logging responses of the main component minerals composed of metamorphic rocks, thus identifying the metamorphic rock lithology. With the adoption of the metamorphic rock lithology identification method, the insufficient that like products do not have certain distiguishment stardards in the prior art is overcome, and the metamorphic rock lithology identification method is simple and effective, has a wide application range, has an important significance on evaluating a metamorphic rock reservoir and is suitable for metamorphic rocks in all regions.

Description

technical field [0001] The invention relates to the field of logging interpretation, in particular to a metamorphic rock lithology identification method. Background technique [0002] The material composition and origin of metamorphic rocks are more complex than those of igneous rocks and sedimentary rocks, which have brought great difficulties to the classification of metamorphic rocks. At present, the widely used classification scheme is isochemical series metamorphic rocks formed according to different protolith types (in metamorphic rocks, all metamorphic rocks with the same original chemical composition but different mineral paragenesis combinations are called isochemical series). At present, similar products on the market generally use neutron-density crossplots or crossplots of other logging curves, which directly use the values ​​of neutron, density, or other logging curves to make crossplots of metamorphic rock intervals. Different lithologies are distinguished by ...

Claims

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Application Information

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IPC IPC(8): G01V11/00
Inventor 尤征
Owner CNPC GREATWALL DRILLING ENG
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