Integrated 3‐D model from gravity and petrophysical data at the Bosumtwi impact structure, Ghana
Integrated 3‐D model from gravity and petrophysical data at the Bosumtwi impact structure, Ghana
复制标题
来自加纳 Bosumtwi 撞击构造的重力和岩石物理数据的集成 3D 模型
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
B. Milkereit
中科院分区：
文献类型：
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作者：
H. Ugalde;S. Danuor;B. Milkereit
2004年，作为国际大陆科学钻探计划（ICDP）的一部分，加纳中部的Bosumtwi冲击构造进行了钻探。从现场前调查和实际钻井阶段可以获得大量的地球科学数据。利用ICDP两个井LB‐07A和LB‐08A的可用数据，建立并校准了三维重力模型。三维重力模型结果与先前收集的地震资料揭示的沉积物厚度和中央隆起的大小，以及LB‐08A和LB‐07A岩心材料和两个井眼测井的岩石物性数据吻合得很好。此外，该模型显示了整个结构的横向密度变化，并改进了之前2.5 - D模型的结果。三维模型的一个重要的新元素是，由多晶片冲击角砾岩和细橄榄岩、单晶片角砾岩和断裂基底组成的层段厚度比数值模拟预测的要小得多。
Abstract— The Bosumtwi impact structure of central Ghana was drilled in 2004 as part of the International Continental Scientific Drilling Program (ICDP). A vast amount of geoscience data is available from the pre‐site surveys and the actual drilling phase. A 3‐D gravity model was constructed and calibrated with the available data from the two ICDP boreholes, LB‐07A and LB‐08A. The 3‐D gravity model results agree well with both the sediment thickness and size of the central uplift revealed by previously collected seismic data, and with the petrophysical data from the LB‐08A and LB‐07A core materials and the two borehole logs. Furthermore, the model exhibits lateral density variations across the structure and refines the results from previous 2.5‐D modeling. An important new element of the 3‐D model is that the thickness of the intervals comprising polymict lithic impact breccia and suevite, monomict lithic breccia and fractured basement is much smaller than that predicted by numerical modeling.
ICDP 博苏姆特维湖撞击坑科学钻探项目（加纳）：核心 LBâ08A 岩石、相关喷射物和冲击恢复实验
影响因子：
2.2
作者：
Deutsch;Luetke;Heinrich
通讯作者：
Heinrich