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1 前言 Ｍａｈａｋａｍ褶皱带位于Ｂｏｒｎｅｏ岛东部边缘第三纪Ｋｕｔａｉ盆地的滨岸区部分内 (图 1 )。褶皱带内的ＳａｎｇａＳａｎｇａ区有四个大到巨大的烃类富集区 :Ｍｕｔｉａｒａ ,Ｓｅｍｂｅｒａｈ、Ｎｉｌａｍ和Ｂａｄａｋ油田(Ｂａｔｅｓ,1 996)还有许多其它的小
1 Introduction The Mahakam fold belt is located in the shore area of the Tertiary Kutai Basin on the eastern fringe of Borneo Island (Figure 1). There are four large to huge hydrocarbon-rich areas in the fold belt SangaSanga: Mutiara, Semberah, Nilam and Badak (Bates, 1996) There are many other small