Method for measuring leakage caused by drilling in geological storage process of CO2

Abstract

The invention relates to a method for measuring gas leakage caused by drilling in the geological storage process of CO2. The method comprises the following main steps of: 1) before the CO2 is injected, performing background value sampling survey on the CO2 content and isotopic composition of soil at the peripheries of an injection well and a monitoring well, and finding out the content and source of the CO2 in the soil under the undisturbed condition; 2) analyzing the carbon isotope of the injected CO2, marking the feature of the isotope, and injecting into a deep salt water layer; and 3) performing sampling analysis on the content and isotope of the CO2 in the soil at positions which are different distances away from the injection well in different time periods, measuring whether the content of the CO2 in the soil is increased or not compared with that under the undisturbed condition, and measuring a relation between the content and CO2 injection. By the method, the CO2 content and isotopic composition of soil gas at the peripheries of the injection well and the monitoring well in the geological storage process of the CO2 can be monitored, so that the influence of the injection well and the monitoring well on the safety of the geological storage process of the CO2 is evaluated.

Description

technical field [0001] The invention relates to a method for monitoring gas leakage, in particular to a CO 2 Method for determination of gas leakage from drilling in geological storage. Background technique [0002] In the context of global climate change, large-scale deep saline CO 2 Geological storage (CCS) is seen as one of the most potential mitigation measures. In order to ensure its safety and storage effectiveness, CO 2 It is very necessary and urgent to monitor the migration status after injection into the deep saline aquifer. At present, the main focus is on the use of geophysical methods to study the CO 2 Diffusion halos and monitoring of water-rock-gas reactions using geochemical methods. However CO 2 Leakage into shallow aquifers or the surface through fault zones and these injection and monitoring boreholes may endanger the ecosystem. So how to effectively monitor CO 2 leakage, for CO 2 Geological storage has important implications. [0003] Safety mon...

AI Technical Summary

Problems solved by technology

but no to CO 2 Research and monitoring are carried out through fault fracture and injection well leakage after injection, and the possibility of injection well leakage has not been noticed, and there is a lack of evaluation methods

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