TEKTONOSTRATIGRAFI DAERAH LANCANG NATUNA BARAT BERDASARKAN DATA SEISMIK

• Main Author: Abdurrokhim
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/5027
• Institution: Institut Teknologi Bandung

<b>Abstract:<p align=\"justify\"> <br /> <br /> The objective of this study is to create the tectonostratigraphy of Lancang Area based on 2D seismic and well data. Tectonic even recognized from the feature of reflector package geometrically. Each package is grouped based on syntectonic deposit models.<p align=\"justify\"> <br /> Tectonostraatigraphy of Lancang area can be divided into 4 unit : <br /> (1). Synrift (40-30 ma) is characterized by local subsidence in the half graben and depositional of synrift sediment into the basin. Synrift period can be divided into early synrift (-36 ma) and late synrift (-30 ma). Lama Formation and Benua Formation are included into early synrift sediment. The lithostratigraphy of late synrift sediment are Lower tabus Formation.<p align=\"justify\"> <br /> (2) Postrift (30-26 ma), which is marked by the change of subsidence style from local subsidence to regional subsidence. The antithetic fault more active than main fault controlling sediments. Upper Gabus Formation and Middle Gabus Formation are lithostratigraphy in the postrift deposits.<p align=\"justify\"> <br /> (3) Inversion (26-20 ma) is marked by the change of tectonic mode from extensional to become compressional style. Erosion occurred and create syninversion basin. The inversion induces reverse fault, tight fold and uplifted. Erosion occured on the uplifted block of most upper part of postrift sediment. Except in southern dan eastern area, sediments arc deposited during syninversion that include in the Barat Formation.<p align=\"justify\"> <br /> (4) Postinversion (20 -) marked by regional subsidence and deposition of postinversion sediment.<p align=\"justify\"> <br /> The syn tectonic deposits in this study area controlled by two faults system which the orientations are NNW-SSE and NE-SW. The two fault systems control half graben as normal fault when the rifting period (Eo-Oligosen) and became inverted fault in Early Miosen.