RECONSTRUCTION OF THE PALEO DEPOSITIONAL ENVIRONMENT OF THE GH6.2 SAND RESERVOIR

ABSTRACT

The Niger Delta is a prolific hydrocarbon producing belt in the southern Nigeria sedimentary basin on the continental margin of the Gulf of Guinea. This study used well log suites to delineate the hydrocarbon reservoirs, depositional environments and lithostratigraphy of the ARO Field, Onshore Niger Delta, Nigeria. A comprehensive interpretation of Fourteen (14) wells was investigated to identify lithology and delineate depositional environments based on facies types and sedimentary structures. All the wells had calliper (CAL), Gamma Ray (GR), resistivity (ILD), while wells -010, -011, -012 had no spontaneous potential (SP), Sonic (DT). Careful observation of facies trends shows shoreface deposits at the western and eastern flank of the field and channel sand in the middle.Three prominent trends identified on well logs that helped to delineate the various depositional settings are: coarsening upward trend representing point bar or upper shoreface  facies, blocky sand signatures that represent fluvial channels, braided bar or distributary channels and the high gamma ray readings as shales. The regional markers MFS 26.2 Alabamina-2 and MFS 28.1 Bolivia 27 places the time of deposition of the Gh6.2 in the Chattain age of marine transgression.