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首页> 外文会议>Indonesian Petroleum Association Annual Convention v.1; 20031014-20031016; Jakarta; ID >VOLCANIC ORIGIN OF QUARTZ-RICH SEDIMENTS IN EAST JAVA
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VOLCANIC ORIGIN OF QUARTZ-RICH SEDIMENTS IN EAST JAVA

机译：东爪哇富含石英沉积物的火山成因

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摘要

There are important hydrocarbon reserves in East Java in thick sedimentary sequences deposited to the north of the currently active and an older volcanic arc. The 'East Java basins' began to develop in the Eocene but they are not typical extensional or subduction-related basins. Subduction has been continuous to the south of Java since at least the early Tertiary, but surprisingly arc activity has not. A volcanic arc was active in southern Java from the Middle Eocene, much earlier than previously suggested, until the Early Miocene. There was a lull in the Middle Miocene and arc activity resumed and shifted about 50 km northwards in the late Miocene. There are significant volumes of quartz in Eocene and Miocene sands and conglomerates that are important hydrocarbon reservoirs. Previous studies have suggested that the quartz was derived primarily from Sundaland and/or from the basement. However, there were major palaeogeographical barriers between Sundaland sources and there is no significant quartz in basement rocks. New field observations suggest that most of the quartz has a volcanic origin and sequences described as primarily sedimentary contain much volcanic material. The volcanic contribution has previously been underestimated, partly because of the type of material. Volcanic products such as the 'Old Andesites' are easy to recognise but there are also large volumes of ash reworked in marine environments, which are the products of dacitic Plinian-type explosive eruptions. We suggest that most of the Eocene to Miocene sands and muds onland in East Java have a high volcanogenic content. Factors traditionally used to assess the maturity of sediment such as grain size distribution and grain morphology may not be applicable. There are a variety of grain shapes, and sorting is a reflection not of maturity but volcanic processes. These new findings have important implications for provenance, reservoir properties and basin history in East Java.
机译：东爪哇省有重要的碳氢化合物储集层，沉积在当前活动和较老的火山弧以北的厚沉积层中。 “东爪哇盆地”开始在始新世发展，但它们不是典型的与伸展或俯冲有关的盆地。至少从第三纪以来，俯冲一直持续到爪哇南部，但是令人惊讶的是弧活动并未发生。从中始新世以来，爪哇岛南部的火山弧活跃，比以前建议的要早得多，直到中新世早期。中新世中期出现平静，中新世晚期弧活动恢复，并向北移动了约50公里。在始新世和中新世的砂岩和砾岩中有大量的石英，它们是重要的油气藏。先前的研究表明，石英主要来自桑达兰德和/或地下室。但是，在桑达兰各矿源之间存在主要的古地理障碍，并且在地下岩石中没有明显的石英。新的野外观察表明，大多数石英具有火山成因，被描述为主要为沉积岩的层序含有大量的火山物质。以前，由于材料类型的原因，火山作用被低估了。诸如“老安第斯山脉”之类的火山产品很容易辨认，但在海洋环境中也有大量的灰分经过重整，这是达林普利尼型爆炸爆发的产物。我们建议东爪哇岛上大多数始新世至中新世的泥沙具有高的火山成因含量。传统上用于评估沉积物成熟度的因素（例如粒度分布和晶粒形态）可能不适用。谷物的形状多种多样，分类不是成熟度的反映，而是火山过程的反映。这些新发现对东爪哇的物产，储层性质和盆地历史具有重要意义。

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