ApplicAtions ■ Acreage ranking of formation ■ Field-exploration risk assessment ■ Reservoir and well planning

Benefits ■ Reduce exploration and investment risk ■ Increase liquids production ■ Identification of potential Duvernay

formation hydrocarbon sweet spots

feAtures ■ Geological, geochemical, and petrophysi-

cal data in a single 3D Petrel* E&P software platform database for analysis and interpretation

■ Thermal, maturity, and erosion history modeling over time to define liquid-rich zones

■ Regional 3D basin modeling from surface to basement

■ Detailed petrophysical analysis on more than 70 wells across the basin

■ Distributed and mapped reservoir properties based on basinwide petrophysical interpretations

■ Model of Duvernay formation units and facies distributions

The Duvernay Formation Petroleum System Model comprises regional 3D geological PetroMod* petroleum systems modeling software and sweet spot maps for assessing exploration risk and identifying resources in one of the most lucrative unconventional shale gas plays in western Canada.

Data managementConstructed using the Petrel software platform, this 3D basin model represents 224,936 mi2 [362,000 km2] of the Western Canada basin. It contains approximately 3,500 well headers and formation tops, about 1,500 of which have thermal data. About 500 of these tops have vitrinite reflectance data, and about 130 have high-quality temperature data from downhole tests. Around 165 of the publically available wells also have available wireline log data. Top structure maps, isopachs, and lithofacies from the Geological Atlas of the Western Canada Sedimentary basin were used to construct the initial 3D basin model, which was then calibrated to the available formation tops. Additional reservoir, fluid, and kerogen kinetics data from published sources have been incorporated.

Duvernay Formation Petroleum System Model3D petroleum systems modeling and Petrel property mapping

Duvernay formation lithology, rock properties, and thermal maturity outputs from PetroMod and Petrel software culminate in a sweet spot map.

structure facies

rock properties

total organic carbon thermal maturity

sweet spots

Duvernay Formation Petroleum System Model

*Mark of SchlumbergerOther company, product, and service names are the properties of their respective owners.Copyright © 2012 Schlumberger. All rights reserved. 12-DC-0087

petroleum systems modelingOil and gas generated in the Duvernay basin formed during the latest Cretaceous to Paleogene periods, the result of the Laramide orogeny and foreland basin development. Predicting the formation’s maturity through petroleum systems modeling required good estimates of past heat flow and recent erosion. To achieve this, thermal and erosional histories were calibrated to temperature and vitrinite data at more than 160 wells in the study area. The maturity calibrations were supplemented by published pyrolysis Tmax data to help resolve uncertainties in the vitrinite reflectance data and poorly constrained erosion estimates at unconformities.

Schlumberger geoscientists and petroleum engineers combined available data with reservoir expertise to simulate basin maturation over geological time, culminating in a locally calibrated hydrocarbon maturity model that feeds into more-detailed sweet spot mapping.

petrophysical well log analysisOf the nearly 165 public wells in the basin study, 74 were deemed suitable for detailed petrophysical interpretation with ELANPlus* advanced multimineral log analysis. Available LAS-format well log interpretations include water saturation, mineral fractions, porosity, and total organic carbon logs.

sweet spot definition and mappingSchlumberger petrotechnical services applied its unconventional reservoir expertise to regionally define the most prospective Duvernay zones based on reservoir and potential completion quality. Key reservoir properties such as thickness, hydrocarbon maturation, and rock properties have been integrated to produce 2D sweet spot maps.

The basin model and sweet spot interpretations are available in Petrel format and can be used in this format or exported to other working formats. The model can be customized and optimized using geological, geochemical, petrophysical, and production data. Using available 2D and 3D seismic data, seismic reservoir characterization data can also be integrated into the model.

www.slb.com/pts

ELANPlus petrophysical well log interpretation of the Duvernay formation.