Modeling CO2H2SWaterRock Interactions in Williston Basin Carbonates Under Reservoir Conditions
This work reports results that were obtained during a series of laboratory experiments and numerical modeling of geochemical reactions performed by the Plains CO2 Reduction (PCOR) Partnership. The PCOR Partnership represents more than 80 public and private sector partners located in nine states and four Canadian provinces in the heartland of North America. It is one of seven regional partnerships that make up the Regional Carbon Sequestration Partnership Program managed within the U.S. Department of Energy's Office of Fossil Energy and implemented through the National Energy Technology Laboratory. The main goal of these experiments was to determine the chemical kinetics of mineral dissolution and precipitation caused by carbon dioxide or sour gas injection into a Williston Basin (North Dakota, USA) formation for storage or enhanced oil recovery (EOR).In order to simulate these geochemical reactions, core samples were collected from the Mississippian Madison Group, a carbonate-dominated group of formations in the Williston Basin. Also, several pure mineral samples (e.g., magnesite, magnetite, etc.) were obtained from commercial vendors and utilized as kinetic indicators. Samples in a form of powder and solid core plugs were exposed for a period of 4 weeks to pure supercritical carbon dioxide (CO2) and a mixture of supercritical CO2 (67.3 mol%) and hydrogen sulfide (32.7 mol%) at 2250 psi (155 bar) and 158°F (70°C) in 10 wt% NaCl synthetic brine conditions. The mineralogy of the Madison Group samples was determined utilizing x-ray diffraction (XRD), x-ray fluorescence, and QEMSCAN® analytical techniques, and integrative mineralogical analysis was performed utilizing linear program normative analysis. This analysis demonstrated the presence of ankerite, anorthoclase, anhydrite, calcite, cristobalite, dolomite, halite, hematite, kaolinite, illite, pyrite, and quartz in the Madison Group samples. The reactive surface area analysis was perView/Download Document
Event/Meeting Information
10th International Conference on Greenhouse Gas Technologies (GHGT-10)
9/23/2010
Amsterdam,