The Morrow B exhibits several lithofacies with distinct appearance as well as petrophysical characteristics. The reservoir is in the Pennsylvanian-aged Morrow B sandstone, an incised valley fluvial deposit that is encased within marine shales. Core descriptions and petrographic analyses were used to determine depositional setting, general lithofacies, and a diagenetic sequence for reservoir and caprock at FWU. This paper presents a geological more » description of the rocks comprising the reservoir that is a target for both oil production and CO 2 storage, as well as the overlying units that make up the primary and secondary seals. Collection of a large set of data including logs, core, and 3D geophysical data has allowed us to build a detailed reservoir model that is well-grounded in observations from the field.
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SWP is characterizing the field and monitoring and modeling injection and fluid flow processes with the intent of verifying storage of CO 2 in a timeframe of 100–1000 years. = ,įarnsworth Field Unit (FWU), a mature oilfield currently undergoing CO 2-enhanced oil recovery (EOR) in the northeastern Texas panhandle, is the study area for an extensive project undertaken by the Southwest Regional Partnership on Carbon Sequestration (SWP). While mechanical effects are neglected in the work presented here, complementary parallel studies are underway in which laboratory measurements are introduced to introduce stress dependence of matrix elastic moduli.
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Modeled results are compared with field time-lapse seismic measurements and strategies for numerical model feedback/update are discussed. The resulting fluid/rock physics models will be applied to more » output from the calibrated FWU compositional reservoir simulation model to forward model the time-lapse seismic response. These analyses will be framed in realistic scenarios presented by the FWU CO 2 WAG development. We present systematic analysis of fluid thermodynamics and resulting thermophysical properties, petrophysics and rock frame elastic properties, and elastic property modeling through fluid substitution using data collected at FWU. Most important among these are the thermophysical properties of the original fluid in place and the displacing fluid, followed by the petrophysical properties of the rock matrix, which together determine the effective elastic properties of the rock fluid system. The efficacy of seismic time-lapse depends on a number of key factors, which vary widely from one application to another. In order to evaluate the viability of time-lapse seismic as a monitoring method the Southwest Partnership (SWP) has conducted time-lapse seismic monitoring at FWU using the 3D Vertical Seismic Profiling (VSP) method. As a potential carbon sequestration mechanism, CO 2 WAG projects will be subject to some degree of monitoring and verification, either as a regulatory requirement or to qualify for economic incentives. We present the current status of time-lapse seismic integration at the Farnsworth (FWU) CO 2 WAG (water-alternating-gas) EOR (Enhanced Oil Recovery) project at Ochiltree County, northwest Texas.