Abstract
Kei Kecil Island located at Kei Islands, Maluku Province, Indonesia and it is one of outer Banda Arc. Several compression and extension tectonic accoured in Kei Island that made complex regional structural geology there. Mapping of surface geology has been done by several geoscientists, but subsurface mapping is still challenging. This paper aims to image subsurface geological features in Kei Island and its surrounding. Gravity method carried out to obtain density configuration for interpretation of basin topography. Gravity data obtained from previous publication and the other collected through satellite-derived gravity. Result of analyses show Kei Kecil Island located at depocenter of the basin around the high of the surroundings. Trending of the basin is Northeast–Southwest to North-South. Interpretation reveals basin in the Kei Kecil Island situated in central part toward northern trending almost North-South direction. The higher density rock dominating southern area of the island caused by Weduar and Elat Formation from Kei Besar Island. The denser density dipping from Kei Besar Island to Kei Kecil Island with Northwest direction. The basins in Kei Kecil Island probably produce hydrocarbon.
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