Identification of Gas Sand Horizons of the Rashidpur Structure, Surma Basin, Bangladesh, Using 2D Seismic Interpretation

Table 1

Summarized stratigraphic succession with spatial reflectors position in the Rashidpur structure (after BOGMC [4]).

Age	Group	Formation	Lithologic description	Thickness approximate (m)	Reflectors
Plio-Pleistocene	Dupi Tila	Dupi Tila	Mainly consists of unconsolidated sandstones, gray in color, medium to fine-grained with few soft and soapy sticky, gray clay, and intercalation of silt	314	R1; R2; R3 (UGS); R4; R5 (LGS)
	Tipam	Tipam Sandstone	Consists of gray, brown to pale gray coarse-grained sandstones with intercalation of shale	1030
Early to middle Miocene	Surma	Upper Marine Shale	Claystone or dark gray shale	187 (?)
		Boka Bil Formation	Sandstone, siltstone with alteration of shale	1100
		Bhuban Formation	Composed mainly of sandstones, silty sandstones, and shales. The upper part of this formation consists essentially of sandstone, light gray, moderately consolidated very fine-grained with calcareous cement	470+