首页> 外文会议>Indonesian Petroleum Association Annual Convention v.1; 20031014-20031016; Jakarta; ID >SEISMIC FACIES AND GROWTH HISTORY OF MIOCENE CARBONATE PLATFORMS, WONOCOLO FORMATION, NORTH MADURA AREA, EAST JAVA BASIN, INDONESIA
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SEISMIC FACIES AND GROWTH HISTORY OF MIOCENE CARBONATE PLATFORMS, WONOCOLO FORMATION, NORTH MADURA AREA, EAST JAVA BASIN, INDONESIA

机译:印度尼西亚东爪哇盆地北部马杜拉地区中新世碳酸盐岩台地,沃诺科洛地层的地震相和生长历史

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摘要

The Miocene Wonocolo Formation in the North Madura area, East Java Basin, contains numerous isolated carbonate platforms that are broadly distributed across a ~3000 sq km area of the Indonesian back-arc region. The Wonocolo platforms provide an interesting test for comparing the different growth histories of closely spaced individual platforms, where eustatic history was the same for all the platforms, but where subtle differences in other extrinsic factors influenced their growth. A grid of 2D seismic data and information from several wells across the region were used to map all Wonocolo platforms across the study area. Five growth phases are recognizable in the platforms, based on seismic facies analysis and internal seismic-stratigraphic relationships. Platforms from the western part of the study area are larger in plan view than age-equivalent platforms to the east and record a complex history of platform initiation, backstepping, progradation, coalescence into larger composite platforms, and termination. Although all five growth phases are also recognizable in some Wonocolo platforms from the eastern part of the study area, the eastern platforms are different in that they: 1) are much smaller in plan view, 2) are more widely spaced, 3) tend to have steeper platform margins, 4) have largely aggradational stratal geometries, 5) are slightly thicker overall than the western platforms, and 6) the tops of the platforms are at greater burial depths than the tops of the western platforms. Most of these differences in platform morphology and growth history can be attributed to slightly faster subsidence rates in the eastern part of the study area. Faster subsidence rates in the eastern part of the study area from 12 - 6 Ma (the age range for the Wonocolo platforms) are probably related to differential surface loading by the Indonesian volcanic arc.
机译:东爪哇盆地北马杜拉地区的中新世Wonocolo组包含众多孤立的碳酸盐台地,广泛分布在印尼后弧地区约3000平方公里的区域。 Wonocolo平台为比较紧密排列的各个平台的不同增长历史提供了一个有趣的测试,其中所有平台的欣喜历史相同,但是其他外部因素的细微差异影响了它们的增长。来自该地区多个井的2D地震数据和信息网格被用来绘制研究区域内的所有Wonocolo平台。基于地震相分析和内部地震地层关系,平台上可识别出五个增长阶段。从研究区域的西部看,平台的平面图比东部的同龄平台大,并且记录了平台启动,后推,扩展,合并为更大的复合平台以及终止的复杂历史。尽管在研究区域东部的某些Wonocolo平台上也可以识别出所有五个生长阶段,但东部平台的不同之处在于:1)在平面图中小得多; 2)分布较宽; 3)倾向于具有较陡峭的平台边缘,4)具有较大的聚集地层几何形状,5)总体上比西部平台稍厚,以及6)平台的顶部比西部平台的顶部埋葬深度更大。平台形态和生长历史的大多数差异可归因于研究区域东部的沉降速度稍快。研究区域东部的沉降速度较快(12-6 Ma)(Wonocolo平台的年龄范围)可能与印尼火山弧的地表负荷差异有关。

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