Abstract

The structural entities together forming the tectonic framework of Southeast Asia and Australasia are herein defined according to the type of crust underlying them. As these units of the tectonosphere range widely in age, thickness, composition, and tectonic history and style, each is associated commonly with a cover of sedimentary and igneous rocks of which the thickness, lithology, and structure are to some degree controlled by underlying or adjacent crustal elements.

Consequently, the potentialities of the cover for the generation and storage of hydrocarbons bear some relationship to crustal entities, of which cratons and continental margins offer the best prospects for the discovery of oil or gas in commercial quantities.

Résumé

Les entités structurales qui forment conjointement le bâti tectonique de l'Asie du Sud-Est et de l'Australasie sont ici définies d'après le type de croûte terrestre sous-jacente à chaque entité. Comme ces éléments de la tectonosphère varient considérablement en âge, épaisseur, composition, et en histoire et style tectonique, chacun d'entre eux est en général associé à une couverture de roches sédimentaires et ignées dont l'épaisseur, la lithologie, et la structure sont contrôlées, jusqu'à un certain point, par des éléments de la croûte terrestre sous-jacents ou adjacents. En conséquence, le potentiel de la couverture, en ce qui concerne la génération et la conservation des hydrocarbures, est lié par certaines relations aux entités de la croûte, parmi lesquels les cratons et les marges continentales offrent les meilleures possibilités de découverte de pétrole ou de gaz en quantités commerciales.

1. INTRODUCTION

Southeast Asia is here defined as that part of the Eurasian continent between Afghanistan and Korea, and the islands on its periphery-the Malay Archipelago, Taiwan, and the Ryukyus. Australasia includes Australia, New Zealand, New Guinea, and Southern Oceania. Thus delimited, the purview of this discussion embraces 120 degrees of longitude between latitudes 47"s and 40"N and covers 116687516 km2 (see Fig. 1).

Limitations on space impose cursory treatment of our subject: the relationships between the principal elements that comprise the tectonic framework of the region, and the known and suspected occurrence of petroleum. Furthermore, because some of the nations in this region release only meagre information concerning exploration for, and production of, oil and gas within their borders, and as other participants in this ~ ~~ ~ ~ by N. J. SANDER and W. E. HUMPHREY, Amoco International Oil Company, U.S.A., and J. F. MASON, Continental Oil Company, U.S.A. panel describe these activities in seven discrete regions in the Far East, we present factual and inferred data available to us regarding these matters only in the form of tables (Tables 1-111 an

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