3D-seismic interpretation in the Northern part of Pattni Basin, Gulf of Thailand

Abstract

Oil and gas explorations in Thailand are concentrated in the Tertiary basins. One of the biggest offshore sedimentary basin in Thailand is the Pattani basin, which has many potential oil and gas fields. This project aims to identify the potential reservoirs for oil and gas in the northern part of Pattani basin. By using 3D-seismic data, two-way time structural maps can be generated and some significant features can be defined from attribute maps in order to locate the structural closures that are suitable for hydrocarbon accumulation. From the results of study, the two-way-time structural maps of three Horizons illustrate a structural high in Eastern and Western parts of the area and gently down-dip slope to the graben center. Structures closures were in the up-thrown side of faults that located in the structural high area. In addition, result of attribute analysis for Horizon A shows a continuity of shale surface which was characterized as a regional seal, Horizon B illustrated a paleo-channel feature shown in seismic amplitude map, and Horizons C shown high amplitude anomalies that lie conformably to structure closures. These anomalies were believed to correspond to hydrocarbon accumulation in that closure. The conclusion from combined the structural map with an attribute map confirmed that there are four and three prospected areas in Horizon B and C respectively.