The prediction of Ordovician carbonate karst reservoirs in the Tazhong gas field

Abstract: Ordovician carbonate karst reservoirs in Tazhong area of Tarim Basin are characterized mainly by deep burial, lower seismic data resolution and signal-to-noise ratio, and strong heterogeneity. To solve these problems, the authors employed the train of thought which combined the main geological controlling factors such as ancient landform, ancient water and ancient faults with seismic multi-attributes information fusion technology to analyze and predict the fractured-vuggy carbonate reservoirs of the Ordovician Yingshan Formation in the study area and describe the distribution of different types of karst reservoirs. With this method, the ambiguity is reduced and the precision of reservoir prediction is improved. The results provide a solid foundation for the exploration and production of the study area.