Metamorphic rock component logging identification method based on relative hydrogen-containing index

A technology of hydrogen content index and identification method, which is applied in the field of logging lithology in the petroleum exploration industry, can solve the problems of large metamorphic rocks in the Archaean, achieve accurate lithology identification results, improve exploration effectiveness, and improve the accuracy rate

Active Publication Date: 2021-08-06
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

In addition, this interpretation model works well in Cenozoic clastic rocks, Mesozoic igneous rocks, and Paleozoic carbonate rocks. Natural gamma ray curves often show abnormally high values, and it is difficult to give a good indi

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  • Metamorphic rock component logging identification method based on relative hydrogen-containing index
  • Metamorphic rock component logging identification method based on relative hydrogen-containing index
  • Metamorphic rock component logging identification method based on relative hydrogen-containing index

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Embodiment

[0044] In this embodiment, the Archean strata in the 4430-4900m section of Well B13-2-b is taken as an example, as Image 6 shown. In view of the difficulty of determining the content of felsic minerals in metamorphic rocks and the difficulty of identifying rock components with abnormally high values ​​of natural gamma ray curves ( Image 6 Shown in the 1st track), applying the method of the present invention, the present embodiment constructs a relative hydrogen index curve that has important indication significance to the metamorphic rock rock composition, quantitatively calculates the non-felsic mineral content in the metamorphic rock, and According to the established rock composition classification model of metamorphic rocks, the square wave semi-quantitative identification of lithological composition is carried out.

[0045] Image 6 The seventh curve from the middle left is the constructed relative hydrogen index curve Hindex, the calculation method is: relative hydrog...

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Abstract

The invention discloses a metamorphic rock component logging identification method based on a relative hydrogen-containing index. The method comprises the following steps: constructing a relative hydrogen-containing index curve sensitive to the content of dark minerals by using a neutron and density curve; establishing a quantitative calculation formula of the relative hydrogen-containing index and the total content of the non-long quartz minerals; according to the igneous rock component classification standard, solving the relative hydrogen-containing index limit range corresponding to various component metamorphic rocks through a forward modeling method, calibrating and verifying the rock component limit of various metamorphic rocks through an inversion method, and establishing a metamorphic rock component classification model; and calculating the relative hydrogen-containing index of unknown lithology by using the proposed curve construction method, and performing square wave display according to the established metamorphic rock component classification model to realize semi-quantitative logging identification of the unknown lithology rock components of the metamorphic rock. The method can be used for conveniently and accurately quantitatively calculating the sum of the contents of the non-macromineral in the metamorphic rock, semi-quantitatively identifying the rock components, and providing a reliable basis for subsequent logging comprehensive interpretation, rock naming and the like.

Description

technical field [0001] The invention relates to the technical field of logging lithology in the petroleum exploration industry, in particular to a logging identification method for rock composition of metamorphic rocks based on a relative hydrogen content index. Background technique [0002] The mineral composition of metamorphic rocks, especially the content of dark minerals is an important factor controlling the development of their reservoirs. Logging lithology interpretation is an important content of logging comprehensive interpretation and reservoir evaluation of metamorphic rock reservoirs, and is of great significance to the exploration and evaluation of metamorphic rock reservoirs. The current mainstream logging lithological composition interpretation tools are the Mulitmin module in the Geolog software and the Elan module in the Techlog software platform. Various minerals and their contents can be used to establish a functional relationship, and the contents of va...

Claims

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Application Information

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IPC IPC(8): G01V5/04G01V5/10
CPCG01V5/045G01V5/10Y02A90/30
Inventor 冯冲王清斌杜晓峰庞小军代黎明刘晓健金小燕郭龙龙
Owner CHINA NAT OFFSHORE OIL CORP
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