SEDIMENTOLOGY AND HYDROCARBON POTENTIAL OF THE KUTEI BASIN,WESTERN INDONESIA
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摘要: 为明确库泰盆地充填演化历史与勘探方向,从库泰盆地构造演化分析出发,在明确构造演化对盆地沉积充填控制作用基础上,分析了盆地烃源岩分布和沉积演化特征,探讨了盆地油气勘探方向。研究结果如下:(1)盆地演化经历了3个构造演化阶段,断陷期(始新世)、坳陷期(渐新世-早中新世)、反转期(中中新世之后),并以中新世末为界进一步划分为快速沉积期和剥蚀改造期;(2)陆上始新统烃源岩局部发育,不发育中新统烃源岩;海上发育中新统三角洲煤系烃源岩,具有较强的生烃能力,两套烃源岩分布不同,导致海陆油气发现的差异性;(3)陆上生烃能力有限,超深水区风险较大,有利区位于中新统烃源灶60 km范围内,有利区带内中中新统-上新统岩性圈闭是勘探的潜力目标。Abstract: To better understand the filling history and petroleum geology of the Kutei basin,we studied in this paper the tectonic control over deposition,the distribution pattern of hydrocarbon source rocks and sedimentary evolutionary characteristics of the basin.Petroleum potential of the basin is discussed.The results show that 1)The basin experienced three stages of tectonic evolution,i.e.the rift stage(Eocene), depression stage(Oligocene-Early Miocene)and reversion stage(after Middle Miocene).By the end of Miocene, the basin suffered a transformational period from rapid deposition to erosion;2)Except the Eocene source rocks distributed locally,no Miocene source rocks have been found onshore,while Miocene deltacoal source rocks are widely developed offshore with strong capacity of hydrocarbon generation.The distribution patterns of the two sets of source rocks are different,leading to different discoveries onshore and offshore;3)There is high risk for exploration onland due to the limited capacity of hydrocarbon generation, and the risk in ultra deepwater area is even higher.As the conclusion,the favorable targets are located in the area where the Miocene source rocks occur within the zone upto 60km offshore,and the Miocene-Pliocene lithologic traps are the most potential targets for exploration.
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Key words:
- sedimentary evolution /
- favorable zone /
- Kutei Basin /
- Mahakam Delta
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