Modelling the Impact of Deep Structures on Liquid Production in the Bakken Oil Shale Play of the Williston Basin in Canada and the USA Ruikun Liu, Andy Newson (Moose Oils) and Terry Buchanan (More Oil Recovery Ltd)May 2010

OutlineOverview of Williston BasinWell Performance General ObservationFracture ModelsSalt Collapse Model                                                      Brockton-Froid Model                                                  Natural Fracture Data vs Fracture ModelsConclusions                                                          

Map of Williston Basin From Chen et al 2009Brockton-Froid LineamentTorquay Rocanville TrendPartialSalt SolutionCollapseSaskatchewan

StratigraphyKreis et al (2005)Shaded formations contain salts. (from LeFever and LeFever, 2005) Prairie Evaporite≧180mWater Source~400m

DELTA BAKKEN – L.SHALE: 75m – 30m = 45mEvidence of Syn-Tectonic Salt Collapse11/15-5-1-8W231/4-18-1-8W2NSS. Estevan exhibits 45m growth Bakken to L.Shale4-1815-51 mileTorquay/3 ForksL.Bakken Shale

Bakken Well Performance General Observation100b/d10b/dFRAC NO H2O50% H2OMission Viewfield HZ 12-3H2O RateOil Rate

14-1220052004201020102010201020102007Evolution of HZ Drilling at Tableland2010DOESORIENTATION MATTER?!NOil WellLarge amount of waterUneconomic

Fracture Modelling Using 4DFracSalt Collapse Model Brockton Froid Model  Data Integration:Structural framework model, geocellular model with all applicable parameters for fracture modellingModelling of fractures: DFN generation, and analysis, output of volumetric (porosity, sigma etc) and directional (permeability) propertiesProperty output:Eclipse, Sgrid and VIP format export

Fractures on Salt Collapse StructureNType IType IIWell

Rose Diagram Display of Fractures: Salt Collapse StructureType I FractureType II Fracture

Brockton-Froid ModelN

Fractures on Brockton-Froid ModelNType IType IIWell

Rose Diagram Display of Fractures:Brockton-Froid ModelType I FractureType II Fracture

Fractures in Tableland HZ 14-12FRACTURE TREATMENTS – PROBABLE H20 COMMUNICATION OUT OF ZONE

Fractures in Tableland HZ 14-12Fracture Treatments – Probably H20 communication out of zone

Well data vs Fracture ModelsBrockton-Froid ModelSalt Collapse ModelType II Fracture Waveform Tableland HZ 14-12Type I Fracture

ConclusionsTwo predictive fracture models have been developed for both Brockton-Froid (deep seated fault) and salt collapse scenarios The fracture pattern in the Williston Basin at Tableland may be controlled by complicated, mixed tectonic events of deep seated faulting and post depositional salt collapse.It is proposed that integration of field and well data (e.g. FMI) with the two models will allow a higher degree of success in drilling and completing horizontal wells in the Bakken play of the Williston Basin

AcknowledgementsMidland Valley Exploration Ltd., Glasgow, UK and their structural modelling and analysis software, Move.Bounty Developments Ltd.

Thank You for Your Attention!Email: ruikun_liu@yaoo.comThank You for Your Attention!Questions??