REKONSTRUKSI CEKUNGAN DAN ANALISIS PALINSPASTIK STRUKTUR DI CEKUNGAN BINTUNI, PAPUA BARAT

Abstract

This research is about Basin Reconstruction and Structural Palinspastic Analysis in the Bintuni Basin, West Papua with the aim of restoring a balanced cross section of the Bintuni Basin. The Bintuni Basin is a foreland basin of Tertiary age in the convergent tectonic phase. The research area, namely the Kalitami area, is located in the west of the bintuni basin. This research was conducted with the hypothesis that restoration of the geological cross section of the Kalitami area in the Bintuni Basin would result in shortening of the Miocene and Plio - Pleistocene ages along with convergent tectonics, and this area would have a northwest-southeast trending fold followed by a horizontal fault trending west-east. The method used in the manufacture of geological synthesis consists of 3 stages, namely the Preliminary Stage, Data Collection and Processing, and the Final Stage. Preliminary study in the form of literature review, followed by surface analysis using geomorphological data and bathymetric maps, then subsurface analysis based on seismic data and well data, ending with palinspastic restoration on the west-east section that intersects the folds. Subsurface analysis did not reach the basement. There is no direct data collection in the field. Based on the palinspastic restoration, a negative strain value was obtained which indicated that the study area underwent compressional deformation, causing a shortening of the horizon. The research area experienced 3 (three) tectonic phases, namely extensional phase, passive margin, and compressional. Structural evolution in the research area has implications for hydrocarbon traps in the form of structural traps on faults and anticlinorium, as well as on hydrocarbon migration.

Keywords (sentence case): Bintuni Basin, Palinspastic, Structure, Seismic