Publications

Understanding of deep water sedimentology is an important aspect of hydrocarbon exploration especially the prediction of the geometry, distribution and quality of sandstone reservoirs. Mass Transport Deposit is a sedimentary gravity flow mechanism in the deep-water environment. The Banyak Member is a volcaniclastic sediment of gravity flow, formed during the Late Miocene - Early Pliocene in the Western Kendeng Basin. The intention of this study is to ascertain the genesis of Mass Transport Deposits that comprise the stratigraphy of the research location. Detailed stratigraphy of outcrops was observed to reconstruct sedimentation systems and paleogeographic settings. There are two types of Mass Transport Deposit that can be identified: Type 1, located at the base comprise chaotic units consisting of slumps and various sizes of sandstone-slide blocks floating in a tuffaceous sandy matrix. The ductile shear zone, unsorted and fine-grained matrix are identified. Type 2 is breccia with numerous sizes of andesite fragments supported, unsorted, with the base showing channelized geometry. The large amount of volcanic material in the two types relates to renewed and increasing volcanic eruption activity in the Southern Mountains which results in unstable slopes allowing mass flow complex deposits to be formed.