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Accurate modeling of AEM data for oil and gas exploration in semi-layered environments
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EGM 2010 International Workshop, Apr 2010, cp-165-00033
Abstract
This paper aims at providing more insight into the parameters that need to be modeled during inversion of Helicopter TEM data for accurate modeling in oil and gas exploration applications. We use 2 nominal oil and gas models and synthetic forward data to show in details the effect, both in data and in model space, of the low pass filters, which are present in any system, the waveform repetition, the gate integration, and the current turn on ramp. Results show how low pass filters, gate integration, turn on ramp and waveform repetition are parameters, like frame altitude, Tx Rx timing, ramp turn off and so on, that need to be taken into account and modeled correctly during inversion of HTEM data, in order to recover an accurate geoelectrical model. The shallow to intermediate parts of the model are heavily affected by the filters (and possible gate integration), the deeper parts by gate integration, shape of turn on ramp, and number of waveforms.