Structural and depositional evolution, KH field, West Natuna Basin, offshore Indonesia

Abstract

This study describes the structural and depositional evolution in the KH field in West Natuna Basin, Indonesia. Data for the study were acquired by three-dimensional (3D) seismic reflection volume and a complete suite of well logs. The regional basin underwent transtensional, sinistral shear during the rift phase that reactivated during the early to middle Miocene inversion as a traspressional, dextral shear. The study identified four periods of tectonic activity in the area which are extension, quiescence, compression and another period of quiescence. A structural closure developed along a series of north-south trending, normal splay faults defines the area's trap play. Understanding how this structural play fits into the regional tectonic picture may suggest new approaches to hydrocarbon exploration in the area.