The Study of Supercritical Carbon Dioxide Trapping Behaviour in Carbonate Reservoirs Through Pore-Scale Imaging Analysis

Severe climate change has urged the energy industry to revolutionalise the conventional technologies at pace to curb greenhouse gasses emission for more sustainable future. Carbon Dioxide (CO2) storage at subsurface geological formation remains as the most effective technique to store massive quantity of CO2 safely and permanently. Nonetheless, the flow and trapping behaviours of CO2 at supercritical condition within geological formation are very complex, particularly for the carbonate rocks attributed to the wide spectrum of rock fabrics, pore geometries and structures. This study aims to investigate the pore interconnectivity and residual CO2 trapping during the drainage and imbibition processes within porous media through digital rock technology. Native cores from three carbonate fields with different rock characteristics were plugged to obtain representative samples for the pore-scale coreflooding experiments. Brine and supercritical CO2 were injected into core plugs at temperature up to 120 °C and pressure up to 3000 psi. X-ray images of the saturated core plugs were obtained through micro computed tomography (Micro-CT) facilities after injection of 10 pore volume (PV) of CO2 and 5 PV of brine. Porosity, pore interconnectivity, fluid occupancy, saturation profiles and CO2 ganglia size distribution were measured and studied through the pore-scale imaging analysis. The results indicate that the saturation of CO2 after drainage and imbibition are strongly dependent on the local rock heterogeneity, specifically the presence and distribution of micropores within the rocks. All samples evidently show that micropores play critical role in pore interconnectivity. CO2 ganglia in one sample was observed to be well connected initially but fragmented into smaller sizes after brine imbibition and, lastly, there was no CO2 percolation within the pore network if the flow rate was too low. This paper presents a detailed study in investigating the flow and trapping behaviour of CO2 at supercritical state, providing new insights to the important factors which influence the CO2 trapping. Deeper understanding of the flow and trapping mechanisms is essential to formulate an effective CO2 storage development plan, ensuring minimum injectivity and containment risk throughout the storage period.</p

First Nigerian Bioinformatics Conference (FNBC): towards a dynamic bioinformatics community

The human genome project, which was completed in 2003, ushered in a new era of scientific applications in medicine and bioscience, and also enhanced the generation of high-throughput data which required laboratory and computational analytical approaches in fields known as genomics and bioinformatics respectively. Internationally, specific advances have been achieved which involved the formation and emergence of strong scientific communities to sustain these technological advancements. On the African continent and regionally, the Human Hereditary and Health in Africa (H3Africa), Biosciences eastern and central Africa - International Livestock Research Institute (BecA - ILRI) Hub, and the Alliance for Accelerated Crop Improvements in Africa (ACACIA), are helping to push some of these advances in human health, biosciences, and agriculture respectively. In Nigeria, we believe that significant advances have also been made by various groups since the human genome project was completed. However, a scientific gathering platform to sustainably enable scientists discuss and update these progresses remained elusive. In this article, we report the First Nigerian Bioinformatics Conference (FNBC) hosted by the Nigerian Bioinformatics and Genomics Network (NBGN) in collaboration with the Nigerian Institute of Medical Research (NIMR). The conference was held from 24th - 26th June, 2019, with the theme: “Bioinformatics in the era of genomics in Africa”. Quantitatively, the conference recorded 195 online registered participants, and up to 186 actual participants; comprising of 8 keynote speakers, 6 invited speakers, 25 oral presenters, 83 poster presenters, and up to 73 non-presenting participants. Attendees with national (up to 179) and international (up to 16) affiliations also participated at the conference. Qualitatively, broad scope of bioinformatics, genomics and molecular biology presentations in biomedicine, health, and biosciences were featured at the conference. We discuss the conference structure and activities, lessons learned, and way forward for future bioinformatics conferences in Nigeria. We further discuss the relevance of the conference which presents an increased visibility for the Nigerian bioinformatics community, positions Nigeria as a dynamic community player within the African bioinformatics space, and provides a platform for national impact through the application and implementation of the benefits of bioinformatics