ABSTRACT:

Geomechanical analysis is a key component of high productivity sweet spot identification within an unconventional asset. In this paper, we present the modelling methodology employed during the 3D geomechanical modelling of Unconventional Montney formation in Town field, North East British Columbia, Canada. A systematic analysis and detailed workflow was executed to generate 3D geomechanical model, employing input data from multi-disciplinary sources, which included seismic inversion volumes, seismic horizons and interpreted faults, well log data and 1D Mechanical Earth Model (1D MEM) outputs. The geomechanical rock properties of the 1D MEM were populated using a series of rock properties correlations and modeling workflows developed specifically for Montney Shale formation using the rock mechanics laboratory test data from multiple wells with cores taken across the field. The validated 1D MEMs provided 3D distribution of rock elastic and strength behavior along with pore pressure and stress distribution profiles for the target unconventional formation. These inputs were then subsequently employed for 3D sweet spot volume generation using innovative machine learning modelling tool.

1. Introduction

Reservoir characterization, being a key factor for resource development, is particularly challenging for unconventional reservoirs. The need for hydraulic fracturing treatment places immense significance on completions strategy optimization for production improvement. Optimum well placement, therefore, requires pin-pointing favorable geomechanical conditions for effective hydraulic fracture initiation and propagation. Hence, geomechanical analysis is a key component of high productivity sweet spot identification within an unconventional asset. In this paper, we present the modelling methodology employed during the 3D geomechanical modelling of Unconventional Montney formation in Town field, North East British Columbia (NEBC), Canada.

The Town field target study area is situated in the northwestern part of the Montney depositional basin, immediately east of the Rocky Mountain fold and thrust belt informally referred to as the "Disturbed Belt", and north of the Graben Complex and Peace River. A basement seated shear zone known as the Hay River fault is a major basinal structural lineament striking NE-SW and intersecting the Town field near its southern limit.

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