رسائل ماجيستير
English
2012
Investigation of Source Rock Potential and Micropaleontologyof the Middle Ordovician Hanadir Member of the Qasim Formation,Northwestern Saudi Arabia
اسعد هادي علي غزواني, Khalid Al-Ramadan
كلية هندسة البترول وعلوم الأرض-جامعة الملك فهد للبترول والمعادن · السعودية
THESIS ABSTRACTFull Name:[Assad Hadi Ghazwani]Thesis Title:[I Investigation of Source Rock Potential and Micropaleontology Of MMiddle Ordovician Hanadir Member Of Qasim Formation, NNorthwestern Saudi Arabia]Major Field:[GEOLOGY]Date of Degree:[May,2012]The main purpose of this study is the evaluation of the geochemical source potential of the Middle Ordovician (Llavirnian) Hanadir member of the Qasim Formation in the North West of Saudi Arabia. Cuttings and cores from three wells (A, B, and C) were subjected to Rock-Eval pyrolysis. Additionally, micropaleontological and palynological analyses were conducted to reveal the depositionalenvironment and thermal maturity of the Hanadir.Numerical simulations of 1D basin models were performed for all three wells to support the understanding of the geologic evolution of the Hanadir member. The wells used for this study are located at NE flank of the NW-SE oriented Al Jauf Graben near the border to Jordan. While this tectonic feature was mainly active during the Cretaceous, there is evidence that it already formed during Cambrian times. The average thickness of the Hanadir member in all three wells is about 300 ft. Recently the discovered oldest Paleozoic agglutinated foraminifera analysis suggests the organic matter of the Hanadir member in wells A and B is preserved in anoxic conditions, where in well C it was not preserved in total anoxic bottom water conditions; it may be exposed seasonally to dysoxic conditions. Regionally Hanadir can be correlated with Hiswa Formation in Jordan because they both representing maximum flooding surface MFSO30 during Middle Ordovician and have similar sediment facies.Geochemically the present day organic matter of Hanadir can be correlated with present day organic matter of Hiswa Formation in Jordan because they are both highly mature type II kerogen with range of total organic carbon between 0.05 -2.98% (TOC) in Hanadir and 0.5 -1.5% (TOC) in Hiswa formation and considered as main source of gas in Jordan.All integrated results obtained from Rock-Eval of wells A and B indicates the source rock of the Hanadir is in gas generation window as indicated by low HI, high Tmax, high vitrinite reflectance and present day temperature which implies the Hanadir member is possibly another Paleozoic source rock candidate to be the main source of gas in Northwest of Saudi Arabia.