Stratigraphic boundaries identification from chemostratigraphic intervals in well logs based on first and second derivatives

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• performing an elemental analysis of rock samples from outcrop sections or wells;
• performing data quality checks, data analysis, and filtering on the rock samples, including de-spiking of elemental profiles and elemental ratios;
• calculating first and second derivatives for the elemental profiles and the elemental ratios;
• determining samples and depths that exceed threshold;
• repeating the process for the elemental profiles and the elemental ratios that are related with boundary determination and carbonate or siliciclastic sediments;
• applying additional filters to at least a subset of the elemental profiles and the elemental ratios that are related with boundary determination and carbonate or siliciclastic sediments to enhance the boundary identification;
• and
• determining, by summarizing the additionally filtered elemental profiles and the additionally filtered elemental ratios, possible boundaries in depths of the outcrop sections or wells.

A computer-implemented system, comprising:

• one or more processors;
• and
• a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming instructions for execution by the one or more processors, the programming instructions instruct the one or more processors to perform operations comprising:
• performing an elemental analysis of rock samples from outcrop sections or wells;
• performing data quality checks, data analysis, and filtering on the rock samples, including de-spiking of elemental profiles and elemental ratios;
• calculating first and second derivatives for the elemental profiles and the elemental ratios;
• determining samples and depths that exceed threshold;
• repeating the process for the elemental profiles and the elemental ratios that are related with boundary determination and carbonate or siliciclastic sediments;
• applying additional filters to at least a subset of the elemental profiles and the elemental ratios that are related with boundary determination and carbonate or siliciclastic sediments to enhance the boundary identification;
• and
• determining, by summarizing the additionally filtered elemental profiles and the additionally filtered elemental ratios, possible boundaries in depths of the outcrop sections or wells.