Method to identify oil and gas of Niger delta through log data

Niger delta basin is the world's most important oil and gas-rich basins,oil and gas accumulated in sandstone of Agbada formation. After the integrated analysis of basic ge-ologic data from oil and gas fields of Niger delta,a simple but practicable method is developed to identify oil and gas through well log data,which is based on the route of identification of sands-identification of hydrocarbon-identifi-cation of oil and gas,and gas oil contact (GOO and water oil contact (WOO. Gama ray can be used to identify sands from mud or shell,with negative value to the mud base line of more than 40 API (typically 60-100 API) for sands. Deep resistivity can be used to identify hydrocarbons fromwater,with the value of over 10 ohmm for hydrocarbons in the Upper Section of Agbada Formation,and the value of o-ver 3 ohmm (typically over 5 ohmm) for hydrocarbons in theMiddle and Lower Sections of Agbada formation. Bulk density can be used to identify hydrocarbons' from tight dry sands. Neutron can be used to identify gases from oils,withthe value of below 20 pu (typically below 5-15 pu) for gases while with the value of over 20 pu (typically below 25-40 pu) for oils.