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LIVE WEBINAR – Evaluating Seals: Determining the Hydrocarbon Retention Potential of Caprocks
Tuesday, 1 December, 2020 @ 11:00 am - 12:00 pm (Australia/Perth time)Free – $10.00
Kindly supported by Rock Flow dynamics
This live webinar will take place at:
11am – Perth
12.30pm – Darwin
1pm – Brisbane
1:30pm – Adelaide
2pm – Canberra, Hobart, Melbourne, Sydney
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Tickets are free for members (please log in to see this) and $10 for non members.
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Evaluating Seals: Determining the Hydrocarbon Retention Potential of Caprocks
Presented by John Kaldi
The accumulation of hydrocarbons requires a porous reservoir overlain by an impermeable caprock or seal. The importance of the caprock is that it provides containment of buoyant hydrocarbon. Determining which seals have the potential to trap economically viable hydrocarbon accumulations, versus those that hold sub-economic volumes, has become an important aspect of evaluating both basin-wide petroleum systems and field scale prospects. Reducing the uncertainties associated with the evaluation of seals can be done by understanding the seal potential of the seal. Seal potential is defined as the 1) seal capacity, 2) seal geometry and 3) seal integrity of the caprock. Seal capacity refers to the hydrocarbon column height that the caprock can retain before capillary forces allow the migration of the hydrocarbon into and possibly through the caprock. Seal geometry refers to the thickness and lateral extent of the caprock. The caprock must have sufficient lateral extent to cover whatever structural, or stratigraphic trap is trapping the hydrocarbon accumulation. In addition, it must be thick enough to maintain an effective seal across any faults that displace it. Seal integrity refers to geomechanical properties of the caprock. These properties, controlled by lithology, thickness, ductility and fracture density, are determined by microscopic and macroscopic analyses of the caprock and analyses of regional, local and possible induced stress fields. Case studies from the Gulf of Papua and offshore northwest Java demonstrate the application of seal potential methodology. In a more topical sense, determining the viability of caprocks for the retention of CO2 is a critical element in the selection of sites for safe CO2 injection and secure storage in commercial scale carbon capture and storage (CCS) projects.