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Facies distribution , depositional environment , and reservoir geometries of clastic sandbodies in the Lower Jurassic Mafraq Member ( Oman Mountains , Sultanate of Oman )
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schlaich, Markus Aigner, Thomas Bendias, Daniel |
| Copyright Year | 2018 |
| Abstract | Jurassic mixed carbonate–siliciclastic systems form gas-bearing reservoir units in the subsurface of Oman. In this study, sandstone intervals were studied in two excellent outcrops in the lowermost 40 m of the Lower Mafraq Member in the Oman Mountains. This study focuses on documenting their complex geometry and internal architecture, as well as interpreting their depositional environment. Onedimensional sedimentological analyses were established in four outcrop sections in the Oman Mountains and combined with two-dimensional correlations and outcrop wall panels. Stratigraphic cycles were identified on three scales, i.e., (i) small-scale cycles form (ii) medium-scale cycle sets, and these stack into (iii) large-scale high-frequency sequences. Cycle boundaries were interpreted at prominent surfaces, such as erosional surfaces, often related to the occurrence of sandstones and exposure surfaces with karst features or palaeosoils. The zone of maximum flooding is interpreted within carbonate deposits. A reduced thickness of the most eastern section, as well as a higher number of erosional and exposure surfaces indicates a proximal-distal trend from east to west. Larger-scale high-frequency sequences and medium-scale cycle sets were interpreted to be formed by allocyclic mechanisms. Small-scale cycles often pinch out laterally, thus representing at least partly autocyclic changes. The sandbody thicknesses reach up to 12 m and can be correlated in most cases over a distance of over 4 km. The depositional environment ranges from shallow marine deposits on the shelf to tidal flat, coastal bar sands, and an estuarine multistory channel system. The reservoir quality of sandbodies varies significantly. While most of the sandbodies have a rather low reservoir potential, the estuarine deposits show the best reservoir potential with the highest thickness and probably the largest lateral extent. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://uni-tuebingen.de/index.php?eID=tx_securedownloads&file=/fileadmin/Uni_Tuebingen/Fakultaeten/MatNat/Fachbereiche/Geowissenschaften/Arbeitsgruppen/Angewandte_Geowissenschaften/Sedimentgeologie/publications/Schaich_et_al_2018.pdf&g=0&hash=4d40cdef502b3e26509562535a8a6c657b8644dc&p=94472&t=1565796182&u=0 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
