Integrated geophysical studies of the basement structures, the Mississippi chert, and the Arbuckle Group of Osage County region, Oklahoma
Integrated geophysical studies of the basement structures, the Mississippi chert, and the Arbuckle Group of Osage County region, Oklahoma
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DOI：
10.1306/08241009154
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发表时间：
2011-03-01
期刊：
影响因子：
3.5
通讯作者：
Marfurt, Kurt J.
中科院分区：
文献类型：
--
作者：
Elebiju, Olubunmi O.;Matson, Shane;Marfurt, Kurt J.
我们利用重力、磁场和三维地震数据的整合来绘制俄克拉荷马州东北部奥塞奇县地区的沉积特征，并研究沉积特征与基底特征之间的关系。研究区内明显的重磁异常与中大陆裂谷系有关。然而，我们目前还不能用地质年代测年数据来证实这一结论。地震剖面上有突出的前寒武纪倾斜反射体，表明伸展发生在浅基底侵位之前。在1400 ~ 1340 Ma岩浆省发育早期，可能发生过一次区域性的伸展活动。因此，我们认为我们所看到的构造可能是在这段时间内形成的盆地。我们利用地震数据的相干性和曲率等体积地震属性来更好地表征密西西比系和奥陶系碳酸盐岩矿床的塌陷特征、断裂和压裂等细微特征，这些特征在常规的三维地震数据显示上很难检测到。这些碳酸盐岩储层的混合地震图像显示出多角形、高相干、高振幅的特征，呈东北和西北走向。东北向的构造线与晚古生代Nemaha构造有关，而西北向的构造线则与固有的基底构造或密西西比系在座舱岩溶地形上的褶皱有关。虽然基底构造与碳酸盐岩储层之间不能建立一对一的相关性，但基底构造的轮廓在方向上与密西西比燧石岩和Arbuckle群中所见的相似。
We use the integration of gravity, magnetic, and 3-dimensional (3-D) seismic data to map sedimentary features and study the relationships between sedimentary and basement features in the Osage County area of northeast Oklahoma. The prominent gravity and magnetic anomaly studied within this region are related to the mid-continent rift system. However, we cannot substantiate this conclusion with geochronological age-dating data at this time. Prominent dipping Precambrian reflectors seen on seismic section suggest that extension occurred before emplacement of shallow basement. A regional episode of extension possibly occurred early in the development of the 1400 to 1340 Ma magmatic province. Thus, we interpret the structure we see to be a basin that might have formed during this interval. We use volumetric seismic attributes such as coherence and curvature derived from seismic data to better characterize subtle features such as collapse features and faulting and fracturing within the Mississippian and Ordovician carbonate deposits that are difficult to detect on conventional 3-D seismic data displays. Blended seismic images of these carbonate reservoirs reveal polygonal, highly coherent, and high-amplitude lineaments, which trend northeast and northwest. The northeast-striking lineaments are related to the late Paleozoic Nemaha tectonics, whereas the northwest lineaments are interpreted to be related to the inherent basement fabric or the draping of the Mississippian over a cockpit karst terrain. Although a one-to-one correlation between the basement structures and the carbonate reservoirs cannot be established, basement structure lineaments are parallel in orientation to those seen within the Mississippian chert and the Arbuckle Group.