Study of Dashtak and Kangan Formations Boundary Using Geological and Well log Data in South Pars and Kish Gas Fields Located in the Persian Gulf

چکیده مقاله

In this paper boundary of Dashtak Formation (caprock) and Kangan Formation (reservoir rock) in South Pars and Kish gas fields was described by using well log data, geological information such as cuttings and thin sections, and mud logging data like master log. Trend of variation of this boundary is determined in wells A1 and B1 in Kish field and wells of phases 17 and 18 in south pars. It was concluded that lithology of member S2 in wells under study includes limestone, dolomite and anhydrite and no significant variation was observed except that its thickness increases from Kish field to South Pars field. S1 member (Aghar shale) in Kish gas field consists of gray claystones, light-dark gray shales, green-brown shales with pyrite but the lithology in South Pars becomes dark, gray-light gray, dark reddish brown claystones and also green-reddish brown shales with anhydrite and dolomitic interbeds. Thickness of S1 member increases from 9-11 m in Kish field to 24-27 m in South Pars field. Top of Kangan formation changed from crystalline dolomitic layers in Kish field to Argillaceous limestone and anhydrite in South Pars field. In wells under study it was observed that the boundary of Dashtak and Kangan Formations is continuous and there isn’t any evidence related to sedimentary discontinuity

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