SUMMARY

Modified geological model for the Hải Sư Đen fractured granite reservor, Cửu Long Basin

Nguyễn Quốc Quân

The geological modelling for fractured granite reservoir in the Cuu Long Basin plays an important role for the production forecast, facility investment and project development. In this article, the author established the modified Halo geological model based on faulting systems, depths of objects relatively to the basement surface, which were simulated in the conventional Halo model in order to improve the limitation of previous geological models. The new model was set up based on two types of fractures: macro fracture and micro fracture, which are controlled by the analysis and classification of the basement.

The results have allowed us to subdivide the faults into three major systems and to define the geological boundaries between rock formations characterized by different reservoir capacities. The parallel, subparallel faulting systems and lithological boundaries consist of 33 fault lines, 6 boundaries and demonstrate the best reservoir capacity. The NE-SW (40-50^o, 60-70^o), NW-SE (300-340^o) faults (78 faults) show the second reservoir capacity, while the 20-30^o faults (8 lines) demonstrate the lowest reservoir capacity and are nearly non-reservoir objects

The analysis and classification of the rock field within the Hải Sư Đen Basement was done based on seismic data together with logging data. Three rock fields were defined and are characterized by different reservoir capacities. Field 1 is the best reservoir rock and is followed by field 2 while field 3 shows the lowest reservoir capacity.

Người biên tập: GS. TSKH Đặng Văn Bát.