Bui Huy Hoang (1), Nguyen Thu Huyen (1), Nguyen Tuan Anh (1), Tong Duy Cuong (1), Bui Viet Dung (1), Nguyen Trung Hieu (1) Nguyen Quang Tuan (1), Nguyen Thanh Tung (1), Trinh Xuan Cuong (2), Hoang Anh Tuan (2), Micheal Fyhn (3), Lars Nielsen (3) Ioannis Abatzis (3), Jussi Hovikoski (3), Mette Olivarius (3) 1.Vietnam Petroleum Institute (VPI); 2.Vietnam Oil and Gas Group (PVN); 3.Geological Survey of Denmark and Greenland (GEUS); Email: huyennt@vpi.pvn.vn