基于相和核磁共振的Apollonia非常规气藏岩石物理分析——以埃及西北沙漠Abu Gharadig盆地BED 9气田为例

IF 3.6
Reem Roshdy , Mohsen Abdelfattah , Ilius Mondal , Abdelrahman Abdelsamad , Patricia Pinheiro Beck Eichler , Mohamed Elkammar , Rania Abu-Ali
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引用次数: 0

摘要

BED-9油田早古新世至中始新世的Apollonia组自2006年发现以来,一直是非常规油气勘探的热点。然而,多尺度组分和成岩不一致性为其表征提出了挑战。本研究旨在评价Apollonia组的岩石物理性质,以确定最佳甜点层段。此外,它还试图研究储层岩石类型(RRTs)、沉积环境以及成岩作用对储层质量的影响。本研究的结果如下:1)阿波罗A5和C1单元被确定为“甜蜜点”间隔。有效孔隙度在18% ~ 35%之间,平均渗透率在0.1 ~ 2.0 mD之间,含水饱和度在40% ~ 50%之间,具有良好的储层质量。2)高阶海平面上升变化和重复的气候变化周期显著影响碳酸盐生产力和稀释循环的交替。划分了5个不同的RRTs,代表了从清洁、泥质、碳质白垩质灰岩到泥灰岩和互层页岩的层序变化。3)结合微相变化和动物群含量对电相响应的解释,加深了我们对陆架内外沉积环境的认识。4)成岩作用具有提高和降低储层质量的双重作用。最后,通过对A、B和C段岩石物理和相分析的综合,解决了所有Apollonia段岩石物理特征评价的空白。作为非常规油气资源,Apollonia组具有独特的特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Facies and NMR-based petrophysical analyses of the Apollonia unconventional gas reservoir: A case study from the BED 9 field, Abu Gharadig Basin, North Western Desert, Egypt

Facies and NMR-based petrophysical analyses of the Apollonia unconventional gas reservoir: A case study from the BED 9 field, Abu Gharadig Basin, North Western Desert, Egypt
The Early Paleocene to Middle Eocene Apollonia Formation in the BED9 field has been particularly interesting for unconventional hydrocarbon exploration since its discovery in 2006. However, the multiscale compositional and diagenetic inconsistencies present challenges for its characterization. This study aims to evaluate the petrophysical properties of the Apollonia Formation to locate the sweet-spot intervals. Moreover, it seeks to investigate reservoir rock types (RRTs), depositional settings, and the impact of diagenesis on reservoir quality. The findings of this study are as follows. 1) The Apollonia A5 and C1 units are identified as "sweet-spot" intervals. Their effective porosity ranges from 18 % to 35 %, average permeability varies from 0.1 to 2.0 mD, and water saturation falls between 40 % and 50 %, indicating good reservoir quality. 2) High-order eustatic sea-level changes and repetitive climatic change cycles significantly influence the alternating carbonate productivity and dilution cycles. Five distinct RRTs are classified, denoting a gradational facies change from clean, argillaceous, and carbonaceous chalky limestone to marl and interbedded shale intervals. 3) Interpreting the electro-facies responses, collated with microfacies variations and faunal content, deepens our understanding of the depositional environment, which extends from the inner-to outer-shelf setting. 4) The diagenetic processes have a dual impact that enhances and diminishes the reservoir quality. Finally, the gap in evaluating the petrophysical characteristics of all the Apollonia members has been addressed based on integrating the petrophysical and facies analysis for A, B, and C members. The Apollonia Formation has unique characteristics as an unconventional hydrocarbon resource.
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