Method for estimating uncertainty of indexes of integrity of sedimentary cover of carbon dioxide geological sequestration site

Abstract

The invention discloses a method for estimating uncertainty of indexes of integrity of a sedimentary cover of a carbon dioxide geological sequestration site. The method comprises the following steps of determining influence indexes of the integrity of the sedimentary cover; determining a failure mode; performing calculation to obtain pore pressure in the failure mode; performing five-level tornado analysis on the influence indexes of the integrity of the sedimentary cover; deleting divisors with influence factors of zero to obtain first-order removal indexes; determining a quadratic polynomial regression equation according to the first-order removal indexes; and optimizing the quadratic polynomial regression equation and the first-order removal indexes according to a linear coefficient of the quadratic polynomial regression equation and sensitiveness of a quadratic term coefficient to obtain the optimal carbon dioxide geological sequestration condition of the site. According to characteristics of the structure of the sedimentary cover, influence indexes of the integrity of the sedimentary cover without faults and influence indexes of the integrity of the sedimentary cover with faults are respectively selected. Key influence indexes can be extracted effectively. An optical designing scheme of the key influence indexes of the integrity of the sedimentary cover of the carbon dioxide geological sequestration site is obtained.

Description

technical field [0001] The invention relates to a method for estimating the uncertainty of the cap rock integrity index of a carbon dioxide geological storage site, in particular to the situation where faults exist in complex strata, and belongs to the technical fields of environmental control technology and energy exploitation and underground storage. Background technique [0002] The increase of greenhouse gas emissions to the atmosphere caused by human activities has strengthened the greenhouse effect and is considered to be one of the main causes of global warming, which has become the consensus of all countries in the world. carbon dioxide (CO 2 ) is one of the main greenhouse gases, reducing CO 2 Emissions into the atmosphere are an urgent problem that all human beings need to solve in the next few decades. Currently, carbon capture and storage (CO 2 capture and storage, CCS) is the most promising CO 2 One of the emission reduction measures. [0003] In large scal...

AI Technical Summary

Problems solved by technology

But supercritical CO 2 After injection into the deep reservoir, a stress accumulation area is formed, which changes the stress distribution. When the stress exceeds the breakthrough stress, it may lead to activation of faults and even generate new faults

CO 2 Escape through the conductive channel, which can easily induce leakage and reduce the safety factor of closure

Images