TURBIDITE DEPOSITS FEATURE AS HYDROCARBON RESERVOIR POTENTIAL IN BANYUMAS BASIN F Herdiansyah, M Burhannudinnur, D Syavitri
Department of Geological Engineering, Faculty Technology of Earth and Energy, Universitas Trisakti Jakarta, Jakarta Indonesia
Abstract
The late Miocene sediment turbidite in Banyumas Basin Central java was examined to determining reservoir architecture and analogue. Active hydrocarbon systems are almost indisputable in Banyumas basin due to numerous oil seepage. This paper primarily focused on their characteristics, distribution pattern and predicting porosity-permeability of channelized-non channelized gravity flow deposit. There is interesting discussion about the effects of catastrophic events such as changes in facies turbidite that can be considered to influencing groups of porosity and permeability. The Measurable stratigraphic detail of 8 sections and the “helium porosimetry technique” was carried out on 30 sandstone sample. Porosity and permeability were prelimenary indication to reservoir potential. The lower-upper part of the formation gradationally are generally a siltstone-dominated, interbedded tufaceous siltstone, tufaceous sandstone and carbonate properties. Furthermore, this paper was comparing 5 deposits classification from Bouma sequence (1962), Mutti and Ricci (1972), Walker (1976), Emiliano Mutti (1999), as well as flysch and mollase. Sedimentary structures,textural and vertical succesion of each stratigraphic section were usefull paramaters to determining 5 classifications turbidite deposits. These sediment in the surrounding studied area was interpreted as clasical turbidite, channeled portion of supralobe fan, smooth to channeled portion of supralobe fan on middle-upper, smooth portion of supralobe fan on middle-upper.
