Publications

The sequence stratigraphic concept has greatly improved our understanding of genetic, spatial, and stratigraphic distributions of depositional units, including source and reservoir rock. While sequence stratigraphy is usually used on seismic sections, the sequence principles can be applied readily to outcrop sources. This paper will fully discuss the sequence stratigraphic concept of hetereogentic facies on the Lower Tanjung Formation. The data were collected from the surface outcrops in the Panyiuran District, Southern Kalimantan through field geology mapping. Then we continued to a laboratory analysis of said Eocene outcrops within study area. Several individual facies, in terms of deposition events, were determined in the study area. There are six facies associations from four stratigraphic logs: 1) oligomictite polymodal conglomeratic associates with pebbly, very coarse grain sandstone, 2) massive medium grain sandstone associates with monotoneous interbeds of massive siltstone and laminae fine grain sandstone (co-set S geometry is 13 cm), 3) wavy ripple lamination medium grain sandstone associated with alternate massive mudstone (shally sand), 4) planar cross bed medium grain sandstone alternates of massive fine grain sandstone (15–50 cm), 5) monotoneous interbeds of mud drapes laminae with fine grain sandstones associated with thin coal seam (< 50 cm), 6) thick, wavy rippled laminated fine grain sandstone associated with laminated fine grain sandstone and thick coal seams. According to the integration of all the individual beds, an analysis of the vertical stratum succession, with nearly complete sequences, are observed at the outcrops in the study area. This study has interpreted comprehensive sand deposits in a fluvial-tide estuarine environment, which will be useful to encourage future exploration and development. Keywords: Heterogentic Facies, Sequence Stratigraphy, Fluvial Deposits, Lower Tanjung, Tide Estuary, Middle Tanjung, Southern Barito, Southern Kalimantan.