埃及蜀山盆地下白垩统 Alam El Bueib 砂岩储层评估--对致密油气藏潜力的影响

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

本研究对西部沙漠蜀山盆地早白垩世 Alam El Bueib 地层的潜在储层层段进行了评估。通过评估地震二维线和有线测井(包括图像测井),确定了潜在储层的特征。研究区域的特征是东-西至东-西-西走向的平行陡斜正断层。根据图像测井上的断裂,推断区域最大水平应力方向为 NE-SW。从图像测井仪上观察到的 AEB 地层由块状砂岩、平面层状粉砂岩、砂岩-粉砂岩杂岩和层状页岩组成,沉积于河流沉积环境中。基底面呈西西-东东走向,平均真实倾角为北北东(约 10°)。基于有线测井记录的定量岩石物理评估在 AEB 地层中发现了多个有潜力的含油气储层层段。这些潜在的储油层间很干净,页岩含量为 10%,含水饱和度为 50%。然而,所有这些区间都很致密,有效孔隙度介于 4% 与 12% 之间,主要为 5%。这种致密的有效孔隙度可能是由于 AEB 地层中广泛的二氧化硅胶结造成的,这一点从西部沙漠附近的油田可以看出。据观察,高孔隙度区域含水。在北部和东北部地区钻探的油井显示出的累计净付油厚度在 70 至 150 英尺之间,而东南部地区显示出的累计净付油厚度非常低,仅为 10 至 30 英尺。根据破裂子图像测井,推断出区域最小水平应力方位为西北-东南,这可能是通过优化水力裂缝传播来开采此类致密碎屑岩储层的高偏差或水平井的首选方位。这项工作中介绍的地层评估为了解早白垩世 AEB 的致密油气藏潜力提供了重要信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of the Lower Cretaceous Alam El Bueib Sandstone reservoirs in Shushan Basin, Egypt – Implications for tight hydrocarbon reservoir potential

This study presents the evaluation of the potential reservoir intervals in the early Cretaceous Alam El Bueib Formation of the Shushan Basin, Western Desert. Seismic 2D lines, and wireline logs (including image logs) were assessed to characterize the potential intervals. The study area is characterized by E-W to ENE-WSW striking parallel sets of steeply dipping normal faults. Based on the breakouts on image log, the regional maximum horizontal stress orientation is inferred as NE-SW. The AEB Formation, as observed on the image log, consists of massive sandstones, planar laminated siltstones, sandstone-siltstone heteroliths and laminated shales, deposited in a fluvial depositional environment. The bedding planes are WNW-ESE striking with a mean true dip of NNE (around 10°). Wireline log based quantitative petrophysical assessment identified multiple promising hydrocarbon-bearing reservoir intervals within the AEB Formation. The potential reservoir intervals are clean with shale content <10% with water saturation <50%. However, all these intervals are tight with effective porosity between 4 and 12%, dominantly ∼5%. Such tight effective porosity can be contributed by extensive silica cementation in the AEB Formation, as seen from the nearby fields in Western Desert. High porosity zones are observed to be water-bearing. The wells drilled in the north and northeastern area exhibit a cumulative net pay thickness between 70 and 150 ft, while south-southeastern region exhibits a very low cumulative net pay of 10–30 ft. Based on the breakout son image log, the regional minimum horizontal stress orientation is inferred as NW-SE, which can be preferred azimuth for placing highly deviated or horizontal wells to exploit such tight clastic reservoirs by optimizing hydraulic fracture propagation. The formation evaluation presented in this work shed critical insights into the tight hydrocarbon reservoir potential of the early Cretaceous AEB.

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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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