Carbonate reservoir characteristics and porosity distribution in Souedih Oilfield, northeast Syria

Geoarabia Pub Date : 2014-04-01 DOI:10.2113/geoarabia1902177
A. Ghabra, D. Tatum, A. Gardiner, D. Stow
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引用次数: 1

Abstract

The Souedih (also spelled Suwaidiyah) Oilfield is located in the extreme northeast of Syria in part of the Mesopotamian Basin. The principal reservoir of most fields in this region is the Upper Cretaceous, carbonate-rich Massive Formation. Using data from 25 wells and 36 samples/thin sections, this study focuses on the nature and distribution of porosity in the main Souedih reservoir. The Massive A reservoir is 100Ð120 m thick and represented by uniform, bioturbated bioclastic packstone and bioclastic packstone-grainstone, deposited in a well-oxygenated, moderate to high-energy, shallow-marine environment. It is generally well cemented by microsparite and micrite, and more rarely by sparite. Porosity is highly variable, ranging from < 1% to 20%. Mouldic porosity is the most common type, with rare channel and fracture porosity. Average porosity values tend to decrease eastward across the reservoir, which can also be divided vertically into five zones. The uppermost of these shows the highest average porosity > 15%. The dominance of mouldic porosity throughout the study area indicates that secondary dissolution was the primary cause and that pre-existing bioclasts were the principal targets for this dissolution. The source of these diagenetic fluids is still unclear, although our data do lend some support to the karstification theory. These characteristics are important for understanding and managing reservoir production, not only for Souedih but for the region in general.
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叙利亚东北部Souedih油田碳酸盐岩储层特征及孔隙度分布
Souedih油田位于叙利亚东北部的美索不达米亚盆地的一部分。该地区大部分油田的主要储层为上白垩统富含碳酸盐的块状组。利用25口井和36个样品/薄片的数据,研究了Souedih主要储层的孔隙度性质和分布。块状A储层厚度为100Ð120 m,为均匀的生物扰动生物碎屑岩和生物碎屑岩-颗粒岩,沉积于富氧、中-高能的浅海环境中。通常由微晶岩和泥晶胶结,很少由晶岩胶结。孔隙度变化很大,从< 1%到20%不等。模态孔隙是最常见的孔隙类型,少见通道孔隙和裂缝孔隙。平均孔隙度呈向东递减的趋势,纵向上也可划分为5个带。其中最上面的孔隙度最高,平均孔隙度约为15%。整个研究区以模塑孔隙为主,表明次生溶蚀作用是主要原因,而原生生物碎屑是次生溶蚀作用的主要对象。这些成岩流体的来源仍不清楚,尽管我们的数据确实为岩溶作用理论提供了一些支持。这些特征对于了解和管理储层生产非常重要,不仅对Souedih,而且对整个地区都是如此。
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来源期刊
Geoarabia
Geoarabia 地学-地球科学综合
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审稿时长
>12 weeks
期刊介绍: Cessation. Published from 1996 to 2015, GeoArabia, The Journal of the Middle Eastern Geosciences was a quarterly journal covering the petroleum geosciences in the Middle East. The journal covers subjects such as: - sedimentology - tectonics - geophysics - petroleum reservoir characterization
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