Permeability prediction in the South Georgia rift basin-applications to CO2 storage and regional tectonics

被引:1
作者
Akintunde, Olusoga M. [1 ]
Knapp, Camelia C. [2 ]
Knapp, James H. [2 ]
机构
[1] Univ South Carolina, Columbia, SC 29208 USA
[2] Oklahoma State Univ, Boone Pickens Sch Geol, Stillwater, OK USA
基金
美国能源部;
关键词
CO2; Sequestration; Permeability; Porosity; Resistivity; VELOCITY; BASALT;
D O I
10.1007/s12665-022-10522-6
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Absence of a permeability log necessary to assess reservoir quality and injectivity for potential CO2 storage in the heterogeneous and complex South Georgia Rift (SGR) basin provides the motivation for this study. The focus of this study was on the Triassic-Jurassic red beds buried, entrenched beneath the Cretaceous-Cenozoic Coastal Plain sediments. Moreover, the significant cost typically between $10 M and $100 M associated with drilling and logging for in situ permeability coupled with the limited resolution of existing core data further makes this work necessary. The purpose is to relate, use the interpretation of the predicted permeability distribution to assess feasibility for safe and long-term CO2 sequestration. This study also intends to establish the impacts of active and passive tectonism that has shaped and/or re-shaped the evolution of the basin on the present-day permeability. A methodology was applied that utilizes the pore space and geohydraulic properties of the reservoir from existing laboratory and well data to produce a newly derived permeability log. It shows a non-uniform distribution with depths possibly due to geologic changes in the confined and heterogeneous red beds. The derived log displays characteristics consistent with observations from the porosity and resistivity logs. The interpretation of these logs provides evidence for the presence of low permeable, tightly cemented, and compacted red beds. We conclude that the low permeability aided by the low resistivity depicted in the red beds suggests increased confining stress and reduced injectivity, and that the uncharacteristically low permeability reflects a deformed basin shaped with episodes of uplift and erosion.
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页数:13
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