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Reservoir Monitoring Offshore Sakhalin
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 7th EAGE Saint Petersburg International Conference and Exhibition, Apr 2016, cp-480-00085
- ISBN: 978-94-6282-179-8
Abstract
Sakhalin Energy Investment Company Ltd. is developing the Piltun-Astokhskoye oil field and the Lunskoye gas field off the north-eastern coast of Sakhalin. As part its reservoir management strategy, Sakhalin Energy has conducted 4D seismic surveys to monitor oil and gas extraction and water injection. The company's first 4D survey was recorded in 2010 across the Astokh area. The information distilled from that survey supported development of the Astokh area in the following years. In 2015, the company recorded further 4D seismic surveys, this time expanding subsurface coverage to all of its producing fields. The year 2015 was selected on the basis of forward modelling of representative reservoir models of the fields to be covered. The surveys were designed to maximise repeatability between baseline and monitor surveys. The Piltun-Astokhskoye 4D survey was conducted in an environmentally sensitive area, which placed constraints on the geophysical operations in terms of timing and the amount of noise emitted into the environment. The resulting seismic 4D data will support future field development.