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首页> 外文会议>Offshore Mediterranean Conference and Exhibition >IMPACT OF JURASSIC VOLCANIC ROCKS ON HYDROCARBON EXPLORATION, NORTH WESTERN DESERT, EGYPT
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IMPACT OF JURASSIC VOLCANIC ROCKS ON HYDROCARBON EXPLORATION, NORTH WESTERN DESERT, EGYPT

机译：侏罗纪岩石对埃及北部沙漠勘探的影响

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While exploring for Jurassic hydrocarbons in Shushan Basin, North Western Desert, Egypt, Partial or complete reservoir substitutions, alteration by volcanic, volcaniclastic deposits have led to a number of unsuccessful wells. It is therefore essential to understand the distribution and geometry of volcanics in the vicinity of the Jurassic reservoirs. Many wells have been drilled and the presence of volcanic rocks were not recognized for more than a decade. The Qasr NE -2X well was the first alert that volcanic rocks occur in the Jurassic section. This paper shows detailed integration between spectral GR, triple combo, spectroscopy and image logs were necessary to define and differentiate between volcanic rocks of similar composition or alteration from similar host rocks. The lithostratigraphic cross sections and thickness variations of Jurassic volcanics are discussed in order to distinguish the shape and the extent of the volcanics, but the key is to be able to recognize the volcanics away from well control. The results showed that the emplacement of Jurassic volcanic rocks were from extrusive volcanic events. Thin section and log response of olivine basalt and tuffaceous caps strongly suggest sub-aerial effusive eruption. The identification of volcanic rocks using 3D seismic data is critical from a prospecting point of view. If we are unable to see the volcanic seismic signature we cannot predict their presence. If the volcanic rocks as described above vary from tuffs, altered basalts to un-altered basalts then the resultant reflection coefficients will also vary and in some cases will be similar to the sedimentary country rocks. Other factors with regard to seismic imaging of variable volcanic rocks are thickness, spatial distribution, and seismic data quality. We are studying the response of volcanic rock types using VSP data and well based synthetics and some results are described in this paper. A number of seismic attributes were evaluated including AVO modeling.
机译：在舒山盆地，北西部沙漠，埃及，部分或完整水库取代的侏罗纪烃，在火山的变化中，火山岩储存的改变导致了一些不成功的井。因此，必须了解侏罗纪储层附近的火山的分布和几何形状。已经钻了许多井，并且没有识别火山岩的存在超过十年。 QASR NE -2X井是第一次警报，火山岩在侏罗纪部分发生。本文显示了光谱GR，三重组合，光谱学和图像日志之间的详细集成，以确定和区分类似组成或类似主体岩石的变化的火山岩。讨论了侏罗纪火山岩的岩石岩石横截面和厚度变化，以区分火山岩的形状和范围，但关键是能够将火山岩识别远离控制。结果表明，侏罗纪火山岩的施加来自乌贼火山事件。橄榄石玄武岩的薄截面和日志响应强烈建议亚空气散发爆发。使用3D地震数据的识别来自勘探的观点至关重要。如果我们无法看到火山地震签名，我们无法预测他们的存在。如果如上所述的火山岩从凝灰岩不同，则改变对未改变的基础的底部，那么所得的反射系数也会变化，在某些情况下将类似于沉积乡村岩石。关于可变火山岩地震成像的其他因素是厚度，空间分布和地震数据质量。我们正在研究使用VSP数据和基于井的综合性的火山岩类型的响应，并在本文中描述了一些结果。评估了许多地震属性，包括AVO建模。

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