The New Stratigraphic Play of Ciputat Sub Basin, Indonesia: The Integrated Seismic Sequence Stratigraphic Analysis

Abstract

Ciputat Sub-Basin is one of the basins that has been proven to produce hydrocarbons. The research focus on this study is on Talang Akar Formation in Pondok Makmur Field Area, Ciputat Sub-Basin. The discovery of the Pondok Makmur field was preceded by the successful drilling of PDM-1 which was initiated on November 27, 2007 with an objective of sandstone to conglomerate interbedded sandstone reservoirs of Bottom Talang Akar Formation. So far, lateral mapping of sandstone reservoirs only uses seismic attributes and has not been detailed down to the sandstone layers so the study team performed a study for each parasequence on Talang Akar formation in the study area. Research method used stratigraphic sequence analysis with data source in the form of core data, cuttings, well log, mud log, biostratigraphy data, and 3D Seismic data to find the potential of stratigraphic structural trap. The purpose of this study analysis is to apply the sequence time correlation for exploration activity of stratigraphic trap in Talang Akar Formation of Ciputat sub-basin which aims to know facies variation and deposition environment, to know the swquence boundary, developing system tract, thickness and dispersion from each identified stratigraphic unit, position of the structural-stratigraphical trap, finding hydrocarbon potential and making speculative resources calculations on the structural-stratigraphical traps in not yet drilled areas. In this study, a core description and cuttings can be used to control the well logs that will be used in the interpretation of depositional facies which will be integrated with the depositional age as a result of biostratigraphic analysis into the seismic to obtain the facies boundaries. Once integrated into the seismic, we will condct a facies analysis configuration with ABC method. The result is that the deposition environment that developed in Ciputat Sub-Basin from old to young is intertidal mud sand flat, intertidal sand flat, subtidal, swamp, intertidal mud flat-intertidal mud sand flats, intertidal sand flats, supratidal, and lagoon. The study area has four sedimentation cycles composed from old to young; SB 0-34ma – MFS 0-33 ma, SB 1 – 32ma, MFS 1 – 30.5 ma, SB 2 – 28ma, MFS 2 – 26ma, SB 3 – 23ma, MFS 3 – 22.3 ma dan SB 4 – 21.5ma. From the seismic facies configuration results obtained picture of the North-South direction of the sand prone deposition which is the facies of the subtidal sand bar.

AAPG Datapages/Search and Discovery Article #90332 © 2018 AAPG International Conference and Exhibition, Cape Town, South Africa, November 4-11, 2018