Penentuan Fasies Dan Lingkungan Pengendapan Formasi Bampo Dan Peutu, Area “MFL”, Cekungan Sumatera Utara

Abstrak

The Bampo and Peutu Formations in North Sumatra Basin is adequately known as components of the Neogen hydrocarbon play, where the Bampo Formation as the source rock and the Peutu Formation as the reservoir. The facies analysis carried out includes facies identification, facies associations, and facies succession, followed by sequence stratigraphic analysis and interpretation of the depositional environment. Data integration includes well log data, biostratigraphic and petrographic data, core data, and seismic data, are needed to obtain comprehensive conclusions that will help reconstruct the depositional environment i.e Gross Depositional Environment(GDE) maps and 3D models. The results of thisstudy indicate that the Bampo Formation develops shale and shaly sand facies,while the Peutu Formation develops sandstone, limestone, and shaly sand facies.The facies associations in the Bampo Formation dominated by shale faciesassociations and shale-shaly sand facies associations, while in the PeutuFormation dominated by intercalation of sandstone and shaly sand faciesassociations, shaly sand with thin limestone insert facies associations, andlimestone with thin sandstone or shaly sand inserts facies associations. Then,interpretation of the Gross Depositional Environment laterally in theBampoFormation consist of terrestrial environment, inner shelf, outer shelf, anddeep marine slope, while in the Peutu Formation, the environment laterally hasbecome completely marine, consisting of inner shelf, outer shelf, and deep marineslope.