Thuộc tính địa chấn biên độ trung bình bình phương (Root Mean Square Amplitude), biên độ cực đại (Maximum Amplitude), và tổng biên độ dương (Sum of Positive Amplitude) phản ảnh đặc điểm phân bố của trầm tích cacbonat ám tiêu Miocen giữa, khu vực lô 04-3, bể Nam Côn Sơn một cách rõ rệt nhất. Cacbonat Miocen giữa phân bố phổ biến ở hai mặt phản xạ P1và P2, trong phạm vi mỗi mặt phản xạ, trầm tích cacbonat tập trung ở xung quanh các đới nâng, điển hình như các cấu tạo Thiên Ưng – Mãng Cầu, Đại Hùng và Bồ Câu. | VNU Journal of Science Earth and Environmental Sciences Vol. 36 No. 4 2020 80-89 Original Article Application of Seismuc Attribute Analysis to Reserch the Distribution of Middle Miocene Coral Reef Carbonate in Block 04-3 Nam Con Son Basin Pham Bao Ngoc1 Tran Trung Dong2 Tran Nghi3 Nguyen Thi Phuong Thao3 Tran Thi Oanh1 Pham Thi Thu Hang4 Bui Thi Ngan5 1 Petrovietnam University PVN 762 Cach Mang Thang Tam Long Toan Ba Ria-Vung Tau Vietnam 2 Science Research amp Engineering Institute VSP 105 Le Loi Thang Nhi Ba Ria-Vung Tau Vietnam 3 VNU University of Science 334 Nguyen Trai Hanoi Vietnam 4 Institute of Marine Geology and Geophysics Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Nghia Do Cau Giay Ha Noi 5 Hanoi University of Mining and Geology 18 Pho Vien Duc Thang Bac Tu Liem Ha Noi Received 15 June 2020 Revised 25 August 2020 Accepted 29 August 2020 Abstract The seismic properties of Root Mean Square Amplitude Maximum Amplitude and Sum of Positive Amplitude most clearly reflect the distribution characteristics of middle Miocene carbonate sediments in block 04-3 Nam Con Son basin. Middle Miocene carbonate is commonly distributed on both reflection surfaces of P1 and P2. Within each reflective surface carbonate sediments are concentrated around the uplifting zones such as structures of Thien Ung - Mang Cau Dai Hung and Bo Cau. These are completely consistent with the results of the interpretation of well- log data of Vietsovpetro VSP 1 . The wells C-2X and C-4X located at the edge of the uplifting zone should have the thickest carbonates. According to the results of amplitude attribute analysis these wells are distributed in the high concentration area of carbonate formations. Meanwhile well C-1X and well C-3X which are near the top of the uplifting zone and further away from the uplifting structure have thin carbonate set and belongs to a low carbonate density area. Keywords Seismic attribute middle Miocene carbonate acoustic impedance reef carbonate
