Fractured reservoirs contain a significant proportion of the global hydrocarbon reserves; however, they commonly exhibit unpredictable and extreme production behaviour. To develop such reservoirs it is necessary to obtain the best understanding possible of the fracture network and its impact on the fluid flow within the reservoir, using the full range of geoscience and engineering datasets available at all scales. This book presents an overview of current techniques and the latest technologies used to understand and exploit fractured reservoirs. The contributions are organized into sections on outcrop analogues, the application of geophysical techniques for fracture detection and imaging, numerical and analogue modelling and case studies from fields in the Middle East, Europe and North America. A number of the case studies also consider ways of assessing uncertainties in fracture geometry description and the implications for effective reservoir management.
Transient permeability and reseal hardening in fault zones: evidence from dilation breccia textures
Published:January 01, 2007
N. H. Woodcock, J. A. D. Dickson, J. P. T. Tarasewicz, 2007. "Transient permeability and reseal hardening in fault zones: evidence from dilation breccia textures", Fractured Reservoirs, L. Lonergan, R. J. H. Jolly, K. Rawnsley, D. J. Sanderson
Download citation file:
It is well established that earthquake faulting can create permeability along a fault zone in high competence rocks - by mismatch of the fault walls and by secondary fracture in a surrounding damage zone - and that this permeability is created repeatedly during successive earthquake cycles. Less well proven is that such permeability is transient, being episodically reduced by precipitation of cements in the fracture porosity. The textures of carbonate dilation breccias, formed at around 1.7 km depth on the Dent Fault zone (NW England), lend support to this economically important concept of transient fracture permeability. The key observation...