BIOSTRATIGRAPHY AND PALEOENVIRONMENT OF SECTIONS FROM WELL XY1 AND WELL XY-2, CENTRAL SWAMP DEPOBELT, NIGER DELTA BASIN, NIGERIA

Abstract

Micropaleontological analysis was carried out on eighty-nine (89) ditch cutting samples recovered from well XY-1 and well XY-2 within the depth interval of 1960 -2470 m and 2000 -2380 m with the aim of determining their lithologies, paleoenvironment of deposition and age range. The lithologic description of the samples shows that the lithologies consist of black shale, grey shale, sandy shale, shaly sand and sandstone. The acid maceration method was used to recover the palynomorphs. The ditch cutting samples yielded one-hundred and eighty-three (183) palynomorphs. Five Palynological zones were established for well sections in this study which includes Magnastriatites howardi, Retibrevitricolporites obodoensis, Crassoretitriletes vanraadshooveni, Arecipites exilimuratus and Racemonocolpites hians Zones. Early Oligocene to Middle Miocene age was assigned to the studied sections from the palynological analysis with environment of deposition ranging from middle to inner-neritic to marine