アブダビにおける Mishrif 層礁性石灰岩の堆積相解析の実例について
1987 年 52 巻 1 号 p. 88-98
詳細
1987 年 52 巻 1 号 p. 88-98
The rudist reefal limestone complex of the Mishrif Formation in the Umm Al-Dalkh Field, offshore Abu Dhabi, was divided into several lithofacies from petrographic analysis and electrical log interpretation in the early development stage of the field. To grasp complex distribution of these lithofacies and to construct a three-dimensional geological model of the limestone complex, a technique using seismic impedance analysis was applied.
Fifteen seismic impedance sections and synthetic impedance logs of twenty five wells were prepared. Lithofacies interpretation of the seismic impedance sections was carried out over the field area through correlating to the synthetic impedance logs incorporated with the petrographically derived lithofacies data.
A geological model of the Mishrif Formation obtained by this method indicates that there were four main stages of reefal development and after the last stage, erosion took place in the central build-up area. It is suggested that there is a close similarity between this model and the occurrence of recent reefs in the Arabian Gulf.
