| Title | Formulation of a Porosity Operator for Joint Interpretation of Resistivity and Microearthquake Data Across a Fluid-Filled Fracture Zone |
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| Authors | Stephen Onacha, Peter Malin, Eylon Shalev, William Cummings, Knutur Arnasson, and Bjarni Palsson |
| Year | 2007 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | This paper presents a formulation of a porosity operator that can be used as the basis for joint interpretation of microearthquake and resistivity data across a fluid-filled fracture zone. The use of resistivity and microearthquake measurements is based on theoretical formulation of shared porosity, fluid content and temperature. The relation of resistivity and a double porosityoperator is solved using a basis function. The conceptual model used to formulate the porosity operator over a buried, fluid-circulating fault zone in hydrothermal systems is based on geological and fracture models. The porosity-operator is solved by a basis function and then used to generate a correlation function between P-wave velocity and resistivity. This correlation is then used to generate P-wave velocity and porosity models from 2-D resistivity models generated from magnetotelluric (MT) data through a porosity operator derived from a modified double porosity model. |