Abstract

Permeability is one of the important rock properties for CO2 storage capacity and injectivity to investigating potential CO2 geological storage sites. The core drilling of multiple onshore and offshore boreholes was successfully completed for geological reservoir characterization of CO2 storage sites in Southeast Korea. The directional core analysis was designed specially to measure vertical and horizontal permeabilities with directionally plugged rock core samples. The directional hydraulic properties were determined using portable probe permeameter and one-dimensional pressure cell with different confining pressures. The experimental method for measuring permeability was selected both steady state and pressure decay method according to the range of expected permeability measurements. A small diameter portable probe permeameter was applied for rapidly determining gas permeability to select the lab experimental method for estimating permeability. The promising geological formations (739 ~ 779m) were found for prospective CO2 storage reservoirs with high porosity and permeability. Furthermore, flow modelling for CO2 plum migration pathway was conducted to analyses subsequent flow overlying formations with estimated directional hydraulic properties. Assessed correlation and distribution of directional permeabilities for a potential CO2 geological storage site would be utilized for CO2 storage capacity, injectivity, and leakage risk assessment.

1. Introduction

The most important properties of a CO2 storage reservoir are porosity and permeability. The overall purpose of this research was to investigate storability of formation in the sea near Pohang. To investigate storability, hydraulic properties are measured though drilled rock samples in Pohang basin. To analyze hydraulic properties of vertical and horizontal direction, plug rock samples are made through vertical and horizontal directional coring using drilled rock sample. The porosity of plug rock samples is measured using helium porosimeter and mercury porosimeter. The permeability of these samples is measured using portable probe permeameter and the broadband rock permeability measurement system.

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