Mineralogy and source rock evaluation of the marine Oligo-Miocene sediments in some wells in the Nile Delta and North Sinai, Egypt

Sheikh, Hassan El; Faris, Mahmoud; Shaker, Fatma; Kumral, Mustafa

doi:10.1016/j.jafrearsci.2016.03.001

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…The other eight wells were dry and some had limited gas shows (Hamdy et al, 2021). In comparison with the other petroleum provinces in Egypt, the geochemical studies that previously carried out on the North Sinai offshore are quite little (e.g., Al Sharhan and Salah, 1996;Nashaat, 2000;Dolson et al, 2001;Shabaan et al, 2006;and El Sheikh et al, 2016). The present study essentially aims to characterize some crude oil samples in the offshore North Sinai margin of the Mediterranean basin.…”

Section: Introductionmentioning

confidence: 95%

Geochemical Characteristics of the Crude Oils in the Southeastern Offshore Margin of the Mediterranean Basin, North Sinai, Egypt

2020

Assiut University Journal of Multidisciplinary Scientific Resea

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Source rock characterization in the southeastern offshore margin of the Mediterranean basin was accomplished using five crude oil samples. Two samples were recovered from the Early Cretaceous Malha Formation reservoir in the Mango Basin. Three samples were recovered from the sand bodies within the Late Oligocene Tineh Formation in the Tineh Basin. Little is known about the geochemical characteristics of the organic matter in offshore North Sinai. These samples were tested for API gravity, sulphur content, and gas chromatography in order to infer the origin of organic matter, depositional environments, composition and thermal maturity of the source rock. The results showed that all the studied crude oil samples are characterized by low sulphur content ranging between 0.06 % and 0.24 %. Samples from the Mango-1 well (S4 & S5) shows high specific gravity (36 & 38 API), while S3 from the Tineh-1 well has moderate specific gravity (28.4 API). These results suggest the presence of two different types of oil families. Nickel and vanadium contents revealed that the studied crude oil types from the Mango-1 (S4 & S5) and S2 from Tineh-1 wells are grouped together and differ from S3 in the Tineh-1 well pinpointing to two different genetic oil families. Based on the carbon isotope composition, two main types of the studied crude oils were distinguished: waxy oils in the Tineh-1 well (S2) and the Mango-1 well (S4 and S5) and non-waxy oil in the Tineh-1 well (S3). The n-alkanes/isoprenoids ratios in S4 from the Mango-1 well revealed the highest contribution from the terrestrial organic matter during deposition, whereas the comparative ratios in S1, S2, and S5 showed a mixed source, and S3 showed the highest contribution from marine organic matter. This indicates that the source of the organic matter in the Mango-1 well was deposited under oxic to sub-oxic conditions, while in the Tineh-1 well; the organic matter was deposited under dysoxic to anoxic conditions. These results suggest the presence of two source rocks in the offshore North Sinai. All the samples (S1-S5) from the Mango-1 well and 41

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Section: Introductionmentioning

confidence: 95%

Geochemical Characteristics of the Crude Oils in the Southeastern Offshore Margin of the Mediterranean Basin, North Sinai, Egypt

2020

Assiut University Journal of Multidisciplinary Scientific Resea

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“…Assessment of the hydrocarbon generation potential of source rocks is one of the key aspects of petroleum exploration and development (Magoon & Dow, 1994). Conventional source rock assessment mainly involves the determination of its amount of organic matter, the type of kerogen, and the level of maturation (He et al, 2019; Hunt, 1996; Peters, 1986; Sheikh, Faris, Shaker, & Kumral, 2016; Tissot & Welte, 1984). Most of these data are obtained by geochemical experiments in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Source rock evaluation within a sequence stratigraphic framework of the Palaeogene Liushagang Formation in the Fushan Depression, South China Sea

Zeng

Wang

et al. 2022

Geological Journal

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The Fushan Depression is one of the prolific hydrocarbon‐bearing depressions in the Beibuwan Basin, South China Sea. In this study, a total of 133 mudstone samples, 18 well‐logging curves, and 12 seismic sections were analysed to investigate the geochemical features and spatial distribution of effective source rocks of the Palaeogene Liushagang Formation within a sequence stratigraphic geochemical framework. The results suggest that depositional centres of mudstones northward migrated from the central Huangtong Sag during the Liushagang period. Good hydrocarbon generation potential source rocks containing Type II kerogen occur in the transgressive systems tract (TST)–highstand systems tract (HST) of lower Liushagang sequence (SQls3), the middle Liushagang sequence (SQls2), and the lowstand systems tract (LST)–TST of upper Liushagang sequence (SQls1). The occurrence of effective source rock kitchens, which are mainly controlled by the thermal maturity is distributed in the strip‐shaped area of SQls3 sequence, the whole Huangtong Sag of SQls2 sequence, and the central and northern part of Huangtong Sag of SQls1 sequence, respectively. Fewer hydrocarbon accumulations were found in the southern slope due to the relatively deeper hydrocarbon generation threshold depth and to the limited occurrence of effective source rock kitchens.

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“…1 Location and stratigraphic column of San ElHagar-1 well after El Sheikh et al (2016) properties. Hence, PSD is the main target of this work, means the relative abundance of each pore throat size in a representative pore volume of rock sample and is considered an important entrance to understand reservoir behavior during production and establish many useful correlations using PSD-related parameters.…”

Section: Introductionmentioning

confidence: 99%

Miocene reservoir rocks: pore throat size distribution as a strong controller on petrophysical attributes is a reflection of facies change

Elnaggar

Temraz

2017

J Petrol Explor Prod Technol

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Pore throat size distribution (PSD) is considered a finger print for each rock type and has strong effects on many petrophysical parameters, so a comparative study was done on irregular subsurface rock samples that belong to Kareem and Rudeis Formations of middle and early Miocene, respectively. These samples were collected from San El-Hagar-1 well which is located to the East of the Nile Delta to show the effect of the different lithologies on pore throat size distribution and hence many related reservoir parameters such as displacement pressure, macroporosity, microporosity, mean hydraulic radius and permeability distribution function (PDF). For achieving the previous purpose, helium porosity and capillary pressure by mercury injection were carried out. Permeability measurements were canceled due to the non-cylindrical irregular nature of the tested samples. Porosity showed a great difference between the results of the samples of the two formations. Capillary pressure results showed the presence of characterized pore throat size distribution and hence capillary pressure-derived parameters for samples of each formation. PDF showed that samples of Kareem Fm. have better reservoir flow properties (permeability) in contrast to those of Rudeis Fm. which have tight reservoir flow properties. In addition, petrographical study through thin sections and scanning electron microscope displayed the presence of two facies which are feldspathic quartz wacke (sandstone facies) of Kareem Fm. and bioclastic sandy wackestone (calcareous facies) of Rudeis Fm. All results were consistent and confirmed the influence of facies change on PSD and hence the reservoir parameters.

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Mineralogy and source rock evaluation of the marine Oligo-Miocene sediments in some wells in the Nile Delta and North Sinai, Egypt

Cited by 7 publications

References 11 publications

Geochemical Characteristics of the Crude Oils in the Southeastern Offshore Margin of the Mediterranean Basin, North Sinai, Egypt

Geochemical Characteristics of the Crude Oils in the Southeastern Offshore Margin of the Mediterranean Basin, North Sinai, Egypt

Source rock evaluation within a sequence stratigraphic framework of the Palaeogene Liushagang Formation in the Fushan Depression, South China Sea

Miocene reservoir rocks: pore throat size distribution as a strong controller on petrophysical attributes is a reflection of facies change

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