Method for identifying lithologic characteristics of sand mudstone through rock mineral composition inversion method based on XRF well logging

Abstract

The invention discloses a method for identifying lithologic characteristics of sand mudstone through a rock mineral composition inversion method based on XRF well logging. The method comprises the main steps that firstly, the theoretical basis and the interpretation principle of inversion of rock mineral compositions of the sand mudstone are built; and then, lithologic characteristic quantity parameters, lithologic characteristic quantity indexes and derivative interpretation ratio parameters are calculated, an evaluation standard and a parameter combination for identifying the lithologic characteristics of the sand mudstone are built, and an interpretation evaluation model and procedures for identifying the lithologic characteristics of the sand mudstone are built. The influence of man-made subjective judgment factors is eliminated greatly, and rapid and quantitative lithologic characteristic identifying and evaluation are achieved; and by using the method for identifying the lithologic characteristics of the sand mudstone through the rock mineral composition inversion method based on XRF well logging, the problems that under the rapid well drilling condition, the well drilling parameter characteristic is unapparent, rock debris is fine and mixed, and lithologic characteristic identification is difficult and has the large errors can be well solved, and a reliable reference basis is provided for discovery displaying and rapid interpretation of oil gas, decision-making management for subsequent exploratory development and the like.

Description

Technical field [0001] The present invention relates to the technical field of geology and logging engineering, in particular to a method for identifying sand and mudstone lithology based on XRF logging by inversion of rock and mineral composition, and particularly relates to the rapid identification and profile establishment of wellsite logging lithology, which improves the speed The coincidence rate of sand and mudstone profile recognition under drilling conditions. Background technique [0002] Logging is an important means of petroleum exploration and development, and X-ray fluorescence element logging (XRF) technology is an important wellbore detection technology developed based on wellsite drilling cuttings analysis. The sand and mudstone lithology identification method based on the XRF logging composition inversion method is different from the traditional comprehensive logging lithology identification method. It is a more objective and accurate lithology profile identifica...

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the above-mentioned status quo, to provide a new sandstone lithology identification method based on the inversion method of rock ore composition inversion method based on XRF mud logging, to solve fine and mixed cuttings, difficult lithology identification and homing interpretation under fast drilling conditions Difficult problems, improve the coincidence rate of profile interpretation, quantify the evaluation index and range of lithology identification methods

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