Abstract

Mandapeta Field was discovered in 1988 within prerift sediments of Permo-Triassic age. The gas production of this field was established from Mandapeta sands and further enhanced with the sands within Gollapalli sandstones of Cretaceous age. The Red bed sediments are underlain by Mandapeta sandstone and overlain by Gollapalli sandstone. Red bed deposition marks a hiatus in the geological cycle. The Red bed sections are mainly reddish brown/grey colored shales with sand development at places. Red beds act as cap rock for Mandapeta sandstone but the reservoir layers developed towards the bottom as well as towards the top of the Red beds may be considered for hydrocarbon accumulation. A focused and systematic evaluation has been carried out for Red beds integrating all the available data to identify the potential layers in Mandapeta field.