Petrographical and petrophysical investigations of upper cretaceous sandstones of the South West Sennan field, Western Desert, Egypt
Petrographical and petrophysical investigations of upper cretaceous sandstones of the South West Sennan field, Western Desert, Egypt
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埃及西部沙漠西南 Sennan 油田上白垩统砂岩的岩相和岩石物理研究
DOI：
10.1007/s12517-015-2156-1
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发表时间：
2016
影响因子：
--
通讯作者：
W. Debschütz
中科院分区：
文献类型：
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作者：
Hesham H. Abuseda;A. Weller;C. Sattler;W. Debschütz
Bahariya组砂岩是埃及白垩纪重要的油气藏。本研究的砂岩样品来自位于埃及西部沙漠的西南森南（SWS）油田的Abu Sennan特许权。所研究砂岩样品的矿物组成主要由碎屑石英和石英过度生长（69%至82%）、高岭石（6%至20%）、斜长石和微斜长石（2%至9%）以及富铁黄铁矿和草莓状黄铁矿（2%）组成。副矿物有白云母、黑云母、锆石、金红石、磷灰石和成岩方解石。岩石物理性质表明，所研究的砂岩具有中等程度的成岩作用和胶结作用，因此具有良好的储集条件。我们提供了岩石物理调查和由此产生的关系的详细描述。磁化率已被证明是评价所调查的SWS油田砂岩样品的孔隙度和渗透率的关键参数。显然，已在孔隙空间中沉淀的富铁胶结物控制孔隙度、比内表面和渗透率。除了地层因素、比内表面和电导率的虚部之外，通过核磁共振确定的纵向和横向弛豫时间能够实现可靠的渗透率预测。
The sandstones of the Bahariya Formation represent an important Cretaceous oil and gas reservoir in Egypt. The sandstone samples of this study originate from Abu Sennan concession in the South West Sennan (SWS) oil field that is located in the Western Desert of Egypt. The mineralogical composition for studied sandstone samples is mainly composed of detrital quartz and quartz overgrowth (69 to 82 %), kaolinite (6 to 20 %), plagioclase and microcline (2 to 9 %), and Fe-rich chlorite and framboidal pyrite (2 %). Muscovite, biotite, zircon, rutile, and apatite, as well as diagenetic calcite, are present as accessory minerals. The petrophysical properties indicate a moderate degree of diagenesis and cementation for the investigated sandstones that results in favorable reservoir conditions. We provide a detailed description of the petrophysical investigations and the resulting relationships. The magnetic susceptibility has proved to be a key parameter in evaluating porosity and permeability of the investigated sandstone samples of the SWS oil field. Obviously, Fe-rich chlorite cement that has been precipitated in the pore space control porosity, specific internal surface, and permeability. Beside the formation factor, the specific internal surface, and the imaginary part of conductivity, longitudinal and transversal relaxation times determined by nuclear magnetic resonance enable a reliable permeability prediction.