<em>Cekungan Sumatra Utara merupakan salah satu cekungan produktif di Indonesia yang diketahui memiliki kondisi overpressure berdasarkan beberapa peneliti terdahulu, seperti Aziz dan Bolt (1984) dan Hutasoit, dkk. (2013). Penelitian dilakukan untuk mengetahui zona overpressure pada sumur pengeboran SM-1 di Lapangan “AAS” dengan berdasarkan perhitungan besarnya nilai tekanan pori, mengetahui kedalaman top overpressure, dan mengetahui mekanisme penyebab overpressure berdasarkan log sonic, log densitas, dan log neutron. Nilai tekanan pori didapatkan berdasarkan perhitungan dengan metode Eaton menggunakan data log sonic. Diketahui top overpressure Sumur SM-1 pada kedalaman 1653 ft, dimana zona overpressure berada pada kedalaman 1653 – 2510 ft, 3195 – 3473 ft, dan 4205 – 4486 ft (Formasi Baong). Mekanisme penyebab overpressure pada Sumur SM-1 adalah mekanisme loading berupa disequilibrium compaction.</em>
A detailed stratigraphy description and measurements of the sedimentary facies within the Halang Formation has been carried out to provide a thorough assessment of the architectural facies and depositional environment. The study area is located along the Tajum River in the District of Gumelar, Banyumas, Central Java-Indonesia where most of the Halang Formation is preserved in a good condition. Three cycles of facies association from basin plain, in channel to channel overbank deposits were able to be determined from the formation which indicate very active changes of sub-depositional environment that related to transgressive response influenced by the local tectonic during sedimentation takes place.
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