The central part of offshore Sarawak comprises a smooth continental shelf approximately 300 km wide that forms the easternmost part of the northern Sunda shelf. Geologically, it includes a large part of the younger Tertiary Northwest Borneo sedimentary basin, exposed in the Miri zone of Sarawak. Coastal-plain to deeper marine sediments of Oligocene to Holocene age form the basin fill and are developed in a series of eight regressive depositional cycles. Deformation of the area is most severe in the nearshore part or Balingian Province, where a wide belt of anticlinal structures is developed. The outer shelf area, or Luconia Province, is characterized by an extensive complex of Miocene reefal carbonate rocks formed during a period of maximum transgression.
Exploration of this shelf area has been carried out during the last 15 years by Sarawak Shell Berhad, since 1976 under the terms of a production-sharing agreement with Petronas. To date, many encouraging indications of hydrocarbons, including one oil field and several gas discoveries, have been found. Objectives include sands of coastal-plain and coastal origin in Balingian and reefoid carbonate rocks in Luconia.
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Energy Resources of the Pacific Region
The energy and mineral resources of the vast Pacific basin and its neighboring land areas play a vital role in meeting the ever-growing needs of society worldwide. Building on the foundation of a highly successful conference held in 1978, this volume contains 51 of the 135 papers presented there. Subjects included are general and specific in nature--oil, gas, and coal resources; geothermal fields, uranium; tin; evaporites, trace elements; water resources; magma energy and fuels from magma. Geological and geophysical techniques, and also the new tool of remote sending for petroleum and minerals exploration are represented. Tectonics, structure fundamentals, subsurface hazards, international treaties and the law of the deep sea are discussed. Seventeen countries and regions are represented in these papers: Thailand, Nicaragua, the United States, Japan, Peru, Antarctica, El Salvador, Australia, Mexico, Taiwan, New Zealand, China, Chile, Indonesia, Canada, and the Pacific Ocean.