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| Characterization and evaluation of fracture-cavity type carbonate reservoir in the western part of Northern Tarim uplift |
| Zhang Junlin1, Tian Shicheng1, Zheng Duoming2 |
1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
2. Explorartion and Exploitation Institute of Tarim Oil Field, Korla 841000, China |
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Abstract Fracture-cavity type carbonatite reservoir has strong dimensional anisotropism, and hence reservoir characterization and evaluation are very difficult. The plateau facies carbonatite fracture-cavity reservoir is stably developed in Middle Ordovician strata in western W block of northern Tarim uplift. Utilizing paleo-geographic coordinate transform, logging reservoir analysis and sensibility attributor analysis of the fracture-cavity type carbonatite reservoir, the authors studied the reservoir facies. Based on reservoir facies research and utilizing stochastic method, the authors built the dual porosity model for fracture-cavity reservoir, and characterized the carbonatite reservoir. Finally, in combination with AVO inversion and reservoir characterization, the carbonatite reservoir was evaluated. It is proved that the reservoir pattern in the study area is mainly of the fracture and cavity type, with fractures acting both as hydrocarbon accumulation space and as the factor for the formation of cavity. AFE (Automatic Fault Extraction) and wave classification attribution were sensitive to the fracture and cavity type reservoir. With increasing oil saturation, AVO of the reservoir became more obvious. The fluid prediction method based on pre-stack AVO inversion could reasonably forecast oil province of carbonnate reservoir.
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Received: 06 May 2013
Published: 10 June 2014
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