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

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...

AI Technical Summary

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 indication of the rock composition of metamorphic rocks and be used for well logging interpretation of metamorphic rock rock composition, so it is necessary to construct a curve that is more sensitive to metamorphic rock rock composition

Images