Comparison of surface and near-surface geochemical methods for detection of gas microseepage from carbon dioxide sequestration

Petroleum exploration in Africa from space

“…Figure 4. Bouguer gravity map of the West and Central Africa Rift System (from [9]) with superimposed the licensing blocks of South Sudan case study, Lake Albert case study [5], Lake Turkana case study [6], sedimentary basins and discovered oilfields and microseepage signals.…”

“…It is ruled by light hydrocarbons that flow within a carrier through the reservoir's seal to the surface [5]. Once at surface, microseepage creates a soil atmosphere containing volatile hydrocarbons that interacts with the soil's particles, minerals and the above vegetation.…”

Remote sensing of CO2 leakage from geologic sequestration projects

“…However, it can be difficult with any of the aforementioned techniques to detect a clear CO 2 signature due to CO 2 's abundance in the atmosphere, variability within the air column, and genesis from many natural and anthropogenic sources (Benson and Cook, 2005;Klusman, 2011). It can be useful to instead detect chemical tracers naturally present or added with any injected CO 2 (Leuning et al, 2008;Saripalli et al, 2006).…”

“…These are molecules that occur with low, relatively constant concentrations in the environment and may have absorption spectra more easily detected by such tools as OPFTIR and OPTDL (Wells et al, 2006). Common tracers include noble gases, perfluorocarbons, methane, and carbon isotopologues (Klusman, 2011;Wells et al, 2006). Example tracer spectra are provided in Fig.…”

Sampling strategies using the “accumulation chamber” for monitoring geological storage of CO2

“…Some researchers (Klusman, 2011) have analyzed the advantages and limitations of the measures with accumulation chamber method. In this sense, there are different instruments with different chambers designs and different ways to water removal.…”