PGS Expands 3D Seismic Coverage in West Timor Supporting New Exploration in Indonesia

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Seismic vessel PGS Apollo has commenced a large, high-density, triple-source MultiClient 3D GeoStreamer survey in West Timor as part of a wider campaign in Indonesia. The data will be available for viewing in Q4.

Following the recent North Madura 3D survey, PGS is once again supporting MIGAS, building true broadband 3D coverage over new areas in Timor that will be included in future license rounds.

Dense Sampling with Triple Source

PGS Apollo is towing a triple-source configuration and an efficient wide spread that is designed to deal with operational constraints in the locality and to address geophysical objectives for the survey.

Operationally, the only viable direction of acquisition is parallel to the coast, which is the orientation of geological strike. Therefore, high-density recording in the crossline direction is required to achieve the necessary spatial sampling in the geological dip direction. This is achieved by deploying a triple-source configuration together with a dense streamer spread of 75 m separation, to produce a crossline bin width of 12.5 m.

Typically, triple-source solutions have been used by the industry for gains in efficiency of acquisition. In this instance, PGS is using the technology to deliver denser subsurface crossline sampling. Shot interval in the inline direction is maintained at 12.5 m, to produce an inline bin density of 6.25 m. This will provide uniform illumination of the complex structural regime in Timor, allowing confidence in interpretation and prospect generation.

GeoStreamer Benefits

PGS uses GeoStreamer broadband acquisition to retrieve more detailed data from shallow to deep, and imaging techniques that exploit a full spectrum of low-to-high frequencies. This provides clearer images and more reliable data for AVO/AVA analysis.

GeoStreamer data supports the exploration journey from prospect identification to assessing rock properties. GeoStreamer derived rock properties closely match well measurements, making it possible to extrapolate lithology and better predict fluid types.

West Timor Prospectivity

The region immediately south of West Timor, offshore Indonesia, has been largely underexplored, with only one well drilled onshore within the West Timor Block PSC, and no wells drilled offshore. The area is located along the Outer Banda Arc, a geologically complex, non-volcanic semi-circular belt where the Australian and Asian Plates obliquely collide.

Consequently, the same geological sequences which form part of the highly prolific Australian Northwest Shelf hydrocarbon province extends into this more challenging exploration setting, which must therefore also be considered highly prospective for hydrocarbon exploration.

There is a working petroleum generative system in the region demonstrated by the abundance of oil and gas seeps on Timor.

The main reservoir target is the clastic Late Triassic – Early Jurassic 'Malita-equivalent' and 'Plover- equivalent'. Imaging and resolution of the Top Jurassic horizon and the overlying accretionary section is the primary geophysical objective for prospect generation and poses a formidable challenge to marine seismic acquisition and processing.

Using the latest marine acquisition and imaging technologies we aim to deliver high-quality seismic data of unprecedented resolution from overburden to target level and the deeper section.

West Timor survey area to be included in future licensingThe West Timor 3D MultiClient data will be available for viewing in Q4 2018



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