Sedimentary Model and Reservoir Heterogeneity for Carbonate Beach of Carboniferous in Zanazor, Kazakhstan

Reservoir properties of each part in carbonate beach are obvious different. In this paper, a carbonate beach in carboniferous of Zanazor, Kazakhstan has been analyzed, and result shows that facies are primary cause for... [ view full abstract ]

Reservoir properties of each part in carbonate beach are obvious different. In this paper, a carbonate beach in carboniferous of Zanazor, Kazakhstan has been analyzed, and result shows that facies are primary cause for diversity of reservoir properties. 4 types of wave exist in beach: 1) rising wave is located in area where water depth is higher than normal wave base and have no effect on seabed; 2) upwash wave is generated in area where water depth is lower than normal wave base while higher than two times of wave height; seabed is slightly disturbed; 3) break wave is generated in area where water depth is between one time and two times of wave height; seabed is continuously disturbed; 4) surge-surf wave is generated in area where water depth is lower than wave height and seabed is severe disturbed. According to wave characteristics, carbonate beach have 3 subfacies: 1) Intermittent high-energy beaches distinguished by plaster grain limestone are bed reservoirs which display as low DT, high RD and high GR; 2) rising-break wave beaches distinguished by sparry Foraminifer-Fusulinida limestone are good reservoirs which display as high DT, low RD and low GR; 3) surge-surf wave beach distinguished by sparry oolitic limestone are bed reservoirs which display as low DT, high RD and low GR. From sea to land, parameters are changing: water depth is decreasing; water circulation is decreasing, while salinity is increasing. These differences related to subfacies cause obvious diversity of original and secondary pores. Therefore, facies are main reason for diversity of reservoir property in carbonate beach.