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Fitian R. Al-Rawi Thamer K. Al-Ameri Salih M. Awadh 《Arabian Journal of Geosciences》2014,7(2):545-558
Findings of the oil source affinity for oil sample collected from shallow borehole already drilled for ground water purposes at the Sakran area, NE Haditha city, western Iraq, is performed in this study by biomarker studies with addition to the analysis of gravity map. Petroleum geochemistry study is carried out on oil sample. The terpane and sterane biomarker distributions, as well as the stable isotope values, are used for determining the validity of oil to correlate its source. The results showed that the oil belongs to the Jurassic age, with high sulfur content (2.75 %) and value of C28/C29 up to 0.75. The tricyclic terpanes values as well as hopanes indicated a source rock affinity of carbonates, whereas the pristine/phytane ratio indicated marine algal source of kerogen type II. All these information could confirm that the source rock affinity was the Sargelu Formation (Jurassic), in which their age’s equivalent to the source in East Baghdad Oil Field and Tikrit Oil Field, with a difference from the oil family near the Akkas field, located to the west of the area. Chemical analyses of water sample collected from the borehole showed the following results: TDS?=?12,700 mg/l, EC?=?215,900 μs/cm, pH?=?6.8, DO?=?28 mg/l, and temperature?=?24 °C. Hydrochemical functions such as rNa/rCl (<1), (rNa–rCl)/rSO4 (<0) and rSO4/rCl (<1) indicate that the water is of marine origin, partially mixed with meteoric water. Analysis of the gravity map revealed two anomalous areas; the western one represents large anomaly with EW trend similar to the Anah graben to the north. The second one consists of many anomalies trending N–NW direction. The main local anomaly is identical with the seeps from the drilled borehole covering large area. The boundaries and trends of the main geological structures have been defined by gradient analysis procedure to the gravity data. The closed gravity anomalies with their large extensions reflect the importance of the results for further studies and promising area for oil reservoirs. 相似文献
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Fitian R. Al-Rawi 《Arabian Journal of Geosciences》2013,6(11):4239-4244
Three procedures can be utilized to determine the depth to the center of the horizontal cylinder from gravity profile. Firstly, the gravity profile is subjected to a simple filtering technique. Then, the maximum slope lines are drawn along the flanks of the filtered profile. The horizontal distances between the two slope lines for the positive part are measured at various amplitude levels. A plot of the horizontal distances against amplitude values will give an inclined straight line. The first procedure of depth estimation consists of measuring the distance between the points of intersection of the maximum slope lines at zero level background. This distance, for the positive or negative part, after it is multiplied by the empirical factor, gives directly the depth to the center of the horizontal cylinder. The other two procedures involve fitting a least square line to the inclined straight line of horizontal distances against amplitude values. Then, the maximum amplitude value of the filtered profile multiplied by an empirical factor is used to determine the depth, either graphically or through a simple equation. Accurate results have been achieved with low error percentages for a large number of gravity profiles due to synthetic horizontal cylinders having various depths and radii. 相似文献
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Yehya Al-Rawi 《Sedimentary Geology》1983,35(3):177-192
The Gercus Formation (Eocene) in northeastern Iraq consists of a fluvial sequence of associated red and drab beds deposited under an arid to semi-arid climate. Occurrence of pigment on grain contacts in the sandstones and the uniform distribution of pigment in the marls and siltstones indicate that part of the pigment is of predepositional or syndepositional origin, most probably detrital ferric hydroxides that coated the grains. Alteration and corrosion of iron oxides and ferromagnesian minerals, intensified pigment around some opaque grains, and decreased heavy-mineral content (compared to the recent river sediments in the area) point to intrastratal alteration and the diagenetic origin of part of the pigment. Iron contents indicate that leaching of ferric iron with an average of 1.41% Fe from the drab marl and siltstone beds and 0.74% Fe from the drab sandstone beds washed out the pigment (or its precursor) from these beds. 相似文献
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