Time-lapse electrical resistivity data has been recognized as a source of information for estimating reservoir flow properties in environmental applications. However, transient resistivity data have not been fully utilized in such estimations due to 1) the general lack of an adequate petrophysical transform, and 2) the limited resolution of electrical resistivity tomograms. In this paper we discuss the current limitations in using time-lapse resistivity data to constrain inverse estimates of hydraulic conductivity and present a method that addresses each limitation by leveraging the strong correlation between changes in fluid and bulk conductivity. We demonstrate with a synthetic example the rich amount of information provided by resistivity data and show how that information can be extracted in a meaningful and unbiased manner to estimate reservoir flow properties using a data domain correlation approach.
Lo´pez, Jaime J. Ri´os (Pemex PEP Marina Noreste) | Vidal, Madain Moreno (Pemex PEP Marina Noreste) | Gonza´lez, Manuel (G&W Systems Corp.) | Rusic, Alberto (G&W Systems Corp.) | Srinivasan, Sanjay (University of Texas) | Sen, Mrinal (University of Texas) | Sil, Samik (University of Texas)
Zhou, Chaoguang (Petroleum Geo- Services) | Martínez, Jaime Ramos (Petroleum Geo- Services) | Lin, Sonny (Petroleum Geo- Services) | Jiao, Junru (Petroleum Geo- Services) | Dahl, Sverre Brandsberg (Petroleum Geo- Services)
Introduction Full tensor gravity gradiometry is becoming more commonplace within exploration projects where the benefits of high resolution, multi-component data is proving invaluable for discerning both deep and shallow structures. This paper will demonstrate how the signals measured by gradiometers achieve this by presenting a series of simple examples. Exploiting multi-tensor measurements When a full survey is conducted over an area with adequate sampling then, within the limitations of signal to noise and a few constants of integration, it is possible to predict the gravitational potential and any of its associated derivatives using measurements of only a single field quantity. Common methods of achieving this include Fourier transformations (integration and differentiation in the spatial frequency domain) and equivalent source inversions. For these ideal surveys, measuring multiple components of gravity or gravity gradient serves only to increase the accuracy rather than the ...
Modern hydrogeology is increasingly depending numerical modeling to simulate impacts of water resource projects tens or hundreds of years into the future. The validity of such numerical models is highly dependent on accurate distribution of key hydrogeological parameters. A combination of 3D seismic reflection and Vertical Seismic Profiling (VSP) offers the potential to create detailed, accurate, hydrostratigraphic frameworks within which physical, chemical and biological properties can be distributed. We provide the outline and outcomes from a systematic research program designed to develop and optimize 3D seismic reflection and VSP techniques tailored for hydrogeology. The test site is located at the Beenyup Waste Water Treatment Plant near a major freeway, where a long term high volume purified waste water injection trial will commence in 2009.