Abstract:

In this paper we describe the use of a Heterogeneous Earth Model (HEM) for field scale geomechanical modeling of a large region with seismic, well-log, and core data in the Haynesville shale. Results are used to ascertain the distribution of completion quality across the play by means of geomechanical modeling based on core-measured properties propagated to the seismic-scale. The development of the HEM is a topic of another paper, also submitted to this conference. In that, we explain with sufficient detail, the integration of core, log and seismic data and the comprehensive laboratory characterization that is necessary for populating the geomechanical model. In this paper, we start by uploading the HEM geometry model and the distribution of material properties, to a large scale finite element model (FEM). We impose boundary conditions to realistically represent the overburden and lateral stresses. Multiple measurements of the minimum horizontal stress (from mini-frac measurements) are used to constrain the boundary conditions and to ascertain a good match between the stresses resulting from the imposed boundary conditions, and the measured values. The finite element model helps us evaluating the distribution of stress magnitudes and orientations resulting from the realistic geologic and tectonic setting as well as the overburden loading. Results allow us to address the importance of understanding the vertical and lateral variability in properties and the corresponding variability of stress (magnitude and direction). Results have strong implications on well placement for hydraulic fracturing and wellbore stability applications.

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