Understanding of Reservoir Heterogeneity and its Impact on Flow Behaviour to Facilitate Improve Recovery in A Mature Carbonate Reservoir: An Example from Western Offshore Basin, India
Structural styles and facies architecture are the two fundamental elements that define the reservoir heterogeneity, and eventually determine the capability that either foster or hinder fluid drainage. This is displayed on MMC-I (Middle Miocene Carbonate) reservoir of Mumbai High field in western offshore Basin, India.
Heterogeneity of MMC-I is linked to evolution of reservoir facies under varied depositional environments, structural styles present at the time of deposition and changes brought in due to post depositional tectonic activities. These episodes are instrumental in imparting the vertico-lateral heterogeneity within the reservoir.
To describe these heterogeneities, integrated interpretation approach was adopted by employing data, information, clues and the results of the different disciplines. These have been linked to different entities and sights with full compliance to the concept of geology through merging. Clues, corollaries and conclusions of elemental scale analysis were then stretched, and fashioned to suit reservoir description that validates to properties, attributes, observation, inferences, facies, structure and other related issues. The newly acquired 3-D seismic data interpretation has been of great help in better understanding of the structural style, and its impact on fluid flow behaviour.
The above approach has culminated in deciphering the areas of un-swept hydrocarbons. Optimal strategies for economic realization of these sweet sectors through infill drilling, water flood optimization and strategic re-completions have been suggested.
Key words: Structural style, facies architecture, heterogeneity, and un-swept hydrocarbons.
Revitalizing Mature Fields
2004 AAPG International Conference and Exhibition Technical Program