<p class="western" style="margin-left: -0.08in; margin-right: -0.08in; text-indent: 0in; margin-top: 0.08in; margin-bottom: 0.08in; line-height: 100%;" lang="en-AU" align="justify"><span style="font-size: small;"><span lang="id-ID">Cekungan Banyumas merupakan cekungan sedimen yang terletak di bagian selatan daratan Jawa Tengah, Indonesia. Cekungan Banyumas mempunyai cukup banyak rembesan minyak dan gas bumi, serta telah ada 5(lima) sumur minyak yang dibor namun belum menemukan cadangan yang ekonomis. Tujuan penelitian ini adalah untuk mendapatkan gambaran yang lebih jelas mengenai sejarah geologi Cekungan Banyumas berdasarkan data-data di lapangan, serta mengetahui bagaimana implikasinya terhadap sistem minyak dan gas buminya. Metode penelitian yang digunakan adalah metode pemetaan geologi permukaan yang dikombinasikan dengan data-data bawah permukaan dari data sekunder publikasi sebelumnya. Hasil penelitiannya adalah Cekungan Banyumas pada awalnya merupakan laut dalam, kemudian mulai membentuk cekungan lentur pada umur Oligosen akhir yaitu pada saat terbentuknya Pegunungan Selatan. Saat umur Miosen juga terbentuk busur vulkanik yang lain di sebelah utara Pegunungan Selatan dan terus bergerak ke utara sampai menjadi gunung saat ini yaitu Gunung Slamet. Kesimpulannya Cekungan Banyumas merupakan </span></span><span style="font-size: small;"><span lang="id-ID"><em>Island arc flexure basin</em></span></span><span style="font-size: small;"><span lang="id-ID"> atau </span></span><span style="font-size: small;"><span lang="id-ID"><em>volcanic arc flexure basin</em></span></span><span style="font-size: small;"><span lang="id-ID"> dengan sistem minyak dan gas bumi yang potensial</span></span></p>
The early Middle Miocene Ngrayong Formation, an important reservoir of North East Java Basin, is well exposed in the central anticlinal part of Madura Island. The purpose of current study is to classify the depositional environments of the study area based on the characteristics and geometry of sedimentary facies. In the Madura island, the thicker clastics and deeper carbonates of Ngimbang Formation and Kujung Formation of Late Oligocene-Early Miocene deposited in the northeast-southwest asymmetrical half grabens. After the deposition of Kujung Formation, the basin morphology developed nearly eastwest trending shelf edge and the deposition of Tuban Formation began. The fine grained complex of Tuban Formation was followed by the Ngrayong Sandstones deposition. The depositional model of Ngrayong Formation is being producing of wide variety of depositional environments. Large scale cross-bedded sandstones and bioturbated massive sandstones with thin to medium bedded argillaceous limestone that outcrop in the northern part of the study area are deposited in costal environment. The heterolithic sandstone with planar and trough cross-lamination, fine grained sandstone with interlaminated structure and bioclastic carbonate exposed in the central part of the study area are deposited in upper shallow marine area. Dark grey siltstones and mudstones deposited in lower shallow marine area are well exposed in southern part of the study area. In conclusion, Ngrayong Formation in Madura area is developed in three depositional units which are coastal, upper shallow marine and lower shallow marine.
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