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Automatic lithology identification method of sedimentary rock

A technology for automatic identification of sedimentary rocks, applied in oil exploration and development, and in the field of mud logging in the process of oil exploration and development, it can solve the problems of difficult to realize rapid identification of core lithology, complicated operation, etc., and achieve the elimination of human interference, simple operation and high accuracy high effect

Inactive Publication Date: 2017-05-24
SINOPEC SSC +1
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Problems solved by technology

However, the operation of this method is complicated, and it is difficult to quickly identify the lithology of the core at the mud logging site

Method used

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  • Automatic lithology identification method of sedimentary rock
  • Automatic lithology identification method of sedimentary rock
  • Automatic lithology identification method of sedimentary rock

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Embodiment

[0029] This implementation of the automatic identification method of sedimentary rock lithology is to identify the lithology of the sedimentary rock samples at the logging construction site of Well F3 in Zhongyuan Oilfield. The specific operation steps are:

[0030] 1) Collect standard lithology sedimentary rock core samples from the core warehouse, including mudstone, shale, sandstone, limestone, dolomite, gypsum rock, and salt rock;

[0031] 2) Place the mudstone core sample collected in step 1) on the sample stage of the ZY-LLA laser lithology identification instrument. The surface position is repeatedly detected five times, and 25 sets of laser-induced breakdown spectrum element data information of mudstone cores are detected, and the detection wavelength range is 220.029nm~617.641nm;

[0032] 3) The 5 sets of laser-induced breakdown spectrum element data at the same surface position of the mudstone core detected in step 2) are weighted and averaged respectively to obtain ...

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Abstract

The invention discloses an automatic lithology identification method of a sedimentary rock, and belongs to the technical field of petroleum exploration and development. The method comprises that standard lithology element information is detected, a rock core lithology and element information database is established, the correlation between the element information of a lithology sample to be identified and the element information in the rock core lithology and element information database is analyzed, and the lithology is identified automatically according to the magnitude of a correlation coefficient. The element information is detected by a laser-induced breakdown spectroscopic technology, there is no restriction, the element information of any lithology of the sedimentary rock can be detected, and element information of a fine rock-debris rock sample that cannot be identified by naked eyes can be detected. The method can be used to identify the lithology of the sedimentary rock automatically, interference of artificial factors is eliminated, the accuracy is high, operation is simple, the method is suitable for any well logging site, and the benefit of oil gas exploration and development is improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, in particular to the technical field of mud logging in the petroleum exploration and development process, and in particular to an automatic identification method for sedimentary rock lithology. Background technique [0002] Core lithology judgment is an important means to correctly understand the geological characteristics of oil and gas and the seepage law of lithologic reservoirs, and it is of great significance to guide the deployment and exploration of oil and gas horizontal wells reasonably. Reservoir lithology is mainly divided into three categories: sedimentary rock, igneous rock, and metamorphic rock. For each type of lithology, it is subdivided into various subcategories according to the fluid characteristics and sedimentary thermal properties of the reservoir, so as to facilitate more accurate Determine the exploration performance of rock formations. At pr...

Claims

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Application Information

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IPC IPC(8): G01V8/02
CPCG01V8/02
Inventor 佘明军李油建陶国强李胜利
Owner SINOPEC SSC
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