Facies Analysis and Depositional Environmental Interpretation of The Upper Oligocene, Block 09-2/10, Cuu Long Basin

Abstract

The article presents the facies and environment of the Upper Oligocene sediments in the area of block 09-2/10 based on the analysis of
seismic facies and well data of the neighboring areas. The results of the interpretation of seismic data indicate that the upper Oligocene
sediments are limited by the top C, top D seismic reflectors. The environment is formed from lagoons, lakes to deep lakes. Seismological
facies analysis identified 03 facies including seismic facies with medium to poor reflection amplitude, medium continuous, low frequency
reflecting the lacustrine sediments (80%) in most of the lake center. Strong reflective seismic facies, sigmoidal clinoforms reflect the
lakeside sediments (15%) distributed in the lakeside shelf. The seismic facies with average and continuous amplitude poorly reflect alluvial
sediments (5%) in the Northwest region. The direction of sediment transport is mainly from the Northwest and Southwest in the area. The
sandstone sequences are distributed on the slopes of the lake and the lake bottom, which is potential reservoir.