Characterizing
Distribution and Connectivity of Karst Networks in Carbonate Reservoirs
Shen,
Feng1, Shuiquan Li1, Zhihua Li1 (1) E&P
Tech, Inc, Stafford, TX
In our studied Ordovician carbonate
reservoirs, the karst drainage systems are developed due to the action of
meteoric waters. A new integrated approach is used to assess reservoir
connectivity and permeability heterogeneity. The approach consists of
integrating 3D seismic geometric and lithological attributes and dynamic data
into characterization of distribution and connectivity of karst networks.
Geometric attribute interpretation permits the better identification of
reservoir morphology. Seismic image of reservoir geological features allows the
geomorphic analyses of karst features such as channels, fractures and sink
holes. Lithofacies units are characterized by reconciling multi-attribute data
at seismic and well log scales. For the reservoir modeling, it is necessary to
assess the internal permeability heterogeneity of the reservoir architectural
elements and petrophysical natural of the boundaries among the different
elements. To do so, the geological heterogeneity is identified based on its
effects on reservoir connectivity and permeability, which can help cluster
connectivity heterogeneity. Reservoir dynamic data are also used to quantify
the connectivity of karst networks, structure lineaments and flow unit
boundaries. With the case study, we demonstrate the application of our new
integrated approach to the characterization of distribution and connectivity of
karst networks in carbonate reservoirs. Our results show that quantitative
integrated interpretation of reservoir morphology and porosity variations can
provide a new understanding of reservoir heterogeneity and underlying
geological controls.
AAPG Search and Discover Article #90063©2007 AAPG Annual Convention, Long Beach, California