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Collaborating Authors
Western Australia
Summary The region immediately south of West Timor, offshore Indonesia, has been largely underexplored, with only one well drilled onshore in the West Timor Block operated by eni, 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. The main reservoir target is the clastic Plover formation. 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. The seismic exploration history dates back to a legacy 2D survey in 1991. In 2009, a regional 2D survey using towed streamer dual-sensor broadband technology yielded significantly improved continuity of events beneath the accretionary section. Encouraged by these results, in 2010 eni acquired a pilot study of 2D lines and subsequently a 3D survey using the same broadband acquisition technology. Broadband marine seismic via dual-sensor streamer resulted in improved resolution of the overburden and greater penetration at the target level. These benefits are a direct consequence of eliminating the receiver ghost. Ghost-free data is rich in both low and high frequencies, has improved signal to noise ratio, and is easier to interpret. A second important contribution comes from utilizing a unique implementation of Beam Depth Migration to correctly image the complex overburden and underlying target structure. Unique aspects of this implementation include near-vertical steep dip imaging, residual multiple attenuation in the depth domain, and the ability to detect and correctly position weak signal. These features play an important role in imaging both the accretionary prism and the target structure. The combination of the broadband dual-sensor acquisition and the Beam migration imaging provided significant uplift in the understanding and interpretability of the seismic data promoting the development of a new exploration play in the region.
- Asia > Indonesia (0.72)
- North America > United States > Illinois > Madison County (0.45)
- Oceania > Australia > Western Australia > North West Shelf > Browse Basin > Block WA-315-P > Plover Formation (0.99)
- Oceania > Australia > Western Australia > North West Shelf > Browse Basin > Block WA-274-P > Plover Formation (0.99)
Early Progress and Challenges in Assessing Aggregate Sound Exposure and Associated Effects on Marine Mammals
Streever, Bill (BP) | Ellison, William T. (Marine Acoustics Inc.) | Frankel, Adam S. (Marine Acoustics Inc.) | Racca, Roberto (JASCO Applied Sciences) | Angliss, Robyn (National Marine Mammal Laboratory, Alaska Fisheries Science Center) | Clark, Christopher (Cornell University) | Fleishman, Erica (University of California, Davis) | Guerra, Melania (Cornell University) | Leu, Matthias (The College of William and Mary) | Oliveira, Shirley (BP) | Sformo, Todd (North Slope Borough Department of Wildlife) | Southall, Brandon (Sea-Inc.) | Suydam, Robert (North Slope Borough Department of Wildlife)
Abstract Most assessments of multiple, interacting, and/or repeated anthropogenic underwater sounds (sometimes considered to be an aspect of cumulative effects assessment) rely on narrative descriptions rather than systematic evaluations. In 2010, recognizing the need to better understand the potential effects of multiple sound sources (such as vessels, drilling rigs, pile drivers and seismic operations), British Petroleum (BP) sponsored the University of California to convene an expert committee tasked with advancing a method of systematic evaluation. The method developed by the committee (1) identifies the species, region, and period to be assessed, (2) compiles data on relevant sound sources for that region and period, (3) models the acoustic footprint of those sources, (4) models the movement of simulated marine mammals (animats) through the acoustic footprint, and (5) aggregates data on sound exposure and movements for each of the simulated animals. The method was applied to a test case or trial loosely based on data from the Alaskan Beaufort Sea during a period of seismic exploration and other activities. Substantial additional work is needed to better define output metrics related to degradation of acoustic habitat and to understand the potential effects of multiple sound sources on individuals and populations. Nevertheless, the method provides a starting point that will lead to improved understanding of the implications of multiple underwater sound sources associated with industrial activities.
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.68)
- North America > Canada > British Columbia > North Pacific Ocean > Queen Charlotte Basin (0.99)
- Oceania > Australia > Western Australia > North West Shelf > Carnarvon Basin > Exmouth Basin > Pyrenees Development > Block WA-42-L > Harrison Field (0.95)
- Oceania > Australia > Western Australia > North West Shelf > Carnarvon Basin > Exmouth Basin > Pyrenees Development > Block WA-12-R > Harrison Field (0.95)