--> Abstract: Characterizing Distribution and Connectivity of Karst Networks in Carbonate Reservoirs; #90063 (2007)

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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