Abstract

Shale gas is an important asset now. The production from unconventional reservoir like shale gas has been possible because of horizontal drilling and hydraulic fracturing technologies. Efficient implementation of both of these technologies needs an accurate subsurface model for horizontal drilling in the target layer, and for understanding of the rock properties to design frac jobs. Shales are very heterogeneous and therefore well data alone may not be sufficient to map the subsurface. Geophysical data can provide accurate 3D subsurface images. For analysis of geophysical data a set of geophysical models are very important. Synthetic geophysical responses can be generated for a set of geological scenarios using a reliable rock physics relationship and forward modeling. This paper presents both seismic and electromagnetic (EM) model responses over 1D earth model for a shale gas reservoir, particularly in Bossier/Haynesville shale from East Texas, USA. Seismic attributes (lower P-Impedance and lower Vp/Vs ratio) can be used to map high gas potential zones in a shale reservoir. Considering EM data, MT is not suited, but CSEM data is well suited for mapping high resistive shale gas reservoir in this example