Volcanic rock lithology identification method

A technology of lithology identification and volcanic rock, which is applied in the field of petroleum exploration and development, can solve the problems of low accuracy rate of lithology identification, small drilling cuttings, intermingling of different lithology rocks, etc., and achieve the effect of reliable technical support

Inactive Publication Date: 2019-03-29
中国地质调查局成都地质调查中心 +1
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  • Application Information

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Problems solved by technology

However, with the continuous development of drilling technology, especially the application of PDC bit, composite drilling and other technologies, the drilling cuttings are finer and mixed, the identification degree is getting worse, and the accuracy of lithology identification is getting lower and lower. It has become a technical problem; in addition, the volcanic rocks are complex and changeable, and rocks of different lithologies are mixed with each other, making it difficult to accurately identify

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  • Volcanic rock lithology identification method

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Embodiment 1

[0046] Taking the discrimination method of andesite and basalt in the actual drilling process of QK1 well as an example, the volcanic rock lithology identification method provided by the present invention is applied, and the specific discrimination method is as follows:

[0047] (1) Obtain rock samples and analyze a single layer of the rock samples to obtain the initial percentage content of various major elements; use an X-ray logging instrument to perform X-ray analysis on the rock samples to obtain the Mg, Al , the initial percentage content of Si, P, S, Cl, K, Ca, Ba, Ti, Mn and Fe. The initial percentage contents of Mg, Al, Si, P, S, Cl, K, Ca, Ba, Ti, Mn, and Fe after analysis of the rock samples in this well section were 1.176%, 10.1717%, 74.198%, 4.7252%, and 1.8483%, respectively. %, 1.6305%, 22.5913%, 36.0578%, 16.4569%, 17.6234%, 4.4511%, 64.2834%.

[0048] (2) Calculate the element percentages of different major elements respectively, and obtain the sum coefficien...

Embodiment 2

[0072] Taking the discriminating method of andesite and basalt in the actual drilling process of QK2 well as an example, applying the volcanic rock lithology discriminating method provided by the present invention, the concrete discriminating method is as follows:

[0073] (1) Obtain rock samples and analyze the single layer of the rock samples to obtain the initial percentage content of various major elements; X-ray analysis of the rock samples is carried out with an X-ray logging instrument to obtain Mg and Al in the rock samples. , Si, P, S, Cl, K, Ca, Ba, Ti, Mn and Fe initial percentage content. The initial percentage contents of Mg, Al, Si, P, S, Cl, K, Ca, Ba, Ti, Mn and Fe after analysis of the rock samples in this well section are 2.106%, 12.137%, 69.294%, 6.1563% and 2.5638, respectively. %, 2.0025%, 18.7561%, 31.1286%, 13.2546%, 15.5419%, 6.7846%, 71.4956%.

[0074] (2) Calculate the element percentages of different major elements respectively, and obtain dark mine...

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Abstract

The invention discloses a volcanic rock lithology identification method which belongs to the technical field of petroleum exploration and exploitation. The method comprises the steps of performing element percentage calculation, dark color mineral and coefficient calculation, light color mineral and coefficient calculation, and color rendering rate specific coefficient on 12 major elements which are obtained through analysis of an X-ray logging instrument; performing rock sample identification based on correlation coefficient calculation by means of a two-dimensional plate; and performing whole-segment stratum lithology identification by means of a color rendering rate specific coefficient for realizing fine identification of andesite and basalt. The lithology identification method supplies reliable technical supports for accurate identification of the andesite and the basalt.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, in particular, relates to a method for identifying volcanic rock lithology. Background technique [0002] Lithology identification is mainly guided by theories of petrology, mineralogy and geochemistry, using techniques such as naked eye observation, microscope observation, and chemical composition analysis of rock samples, based on characteristic conditions such as rock color, structure, structure, mineral composition and content, etc. etc. as the basis for the process of accurately naming lithology. Lithology identification is one of the main tasks of geological logging work, the basis for the establishment of geological profiles, and the prerequisite work for the study of strata and reservoirs in the process of petroleum exploration and development. [0003] Andesite belongs to the calc-alkaline neutral extrusive rock saturated with silicic acid, and the color of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 付修根王剑宋春彦孟韶彬徐泽海梁贝贝刘峰
Owner 中国地质调查局成都地质调查中心
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