Khan, I., Ahmad, S., Arif, M., Ali, N., 2016 Impact of diagenetic and depositional fabric
on reservoir quality; a synthesis from Late Cretaceous and Early Paleocene sandstones in Eastern Sulaiman Range, Pakistan.
These pedofeatures indicate that in the Merungle Hill soil in particular, the relict depositional fabric of clay pellets is still evident: the interior mosaic-speckled b-fabric has been preserved.
Pellet preservation and a relict depositional fabric (mosaic-speckled b-fabric for the pellet interior), with little clay illuviation, is common in soil derived from the upper-most (youngest) parna deposits.
The rocks were classified in the field using a hand lens and their depositional fabric
were described .
This is particular true where the depositional fabric
of the horizon slice is poorly imaged or there is low impedance contrast between rock layers.
Based on Dunham (1962) classification two microfacies, mudstone and wackestone were identified and based on the recorded fauna and depositional fabric
, seven sub-microfacies were interpreted including Algal-bioclastic mudstone (MF1), Miliolid-nummulitic mudstone (MF2), Miliolid mudstone (MF3), Unfossiliferous mudstone (MF4), Miliolid wackestone (MF5), Bioclastic wackestone (MF6) and Nummulitic-miscellanea wackestone (MF7).
Under the microscope the AMB 2 facies show a Wackstone to Packstone depositional fabric
. The allomicritic matrix dominates and its abundance ranges from 40 to 60 % with an average of 55%.
Furthermore bathymetric and paleogeographic constraints were also established roughly on basis of limited paleontological information without focusing depositional fabric
and energy conditions.
The dominance of lime mud within the depositional fabric
is indicative of low energy conditions as agitated water does not allow settling of lime mud.
The process of conversion varies from partial to complete obliteration of original depositional fabric
. The next step is neomorphism which takes place in the form of aragonite to calcite transformation aragonite is unstable mineral and
Keywords: Microfacies; Lockhart Limestone; Diagenetic fabric; Depositional fabric
The microfacies is dominated by mud-wackestone with appreciable amount of lime mud within the depositional fabric
and is indicative of low energy conditions, the only condition in which mud could settle down.