Several natural gas flare and oil seepages uphold the source rock potential, structural trap synthesis and lateral facies change analysis of the studied Enugu Formation and the Danian units, for a detailed comprehensive structural trap style, hydrocarbon migration pathway from source rock to the reserves rocks for effective potential efficient hydrocarbon exploration and exploitation drive within the Anambra Basin. The study’s sedimentary structures trapping mechanism and fluid migration pathway model are highlights of source rock potential, hydrocarbon and fluid production architecture of the earth’s crust authenticated by the pore spaces and open and close joint system. The key structural traps of hanging-wall closures, footwall closures, half graben, horst, collapsed-crest-graben of conjugate fault array along with infilled and open joint structures within faulted and unfaulted sandstone sequences exhibits the structural hydrocarbon entrapment mechanisms of the Enugu Formations and Danian outcropping sediments. Primary and secondary hydrocarbon migration pathway in sedimentary rock pores and fracture sequences are the primary means of creating petroleum accumulations and reserves in the Anambra Basin. The study’s oil seepages and natural gas flares reveal the formations’ structural style elements as a petroleum system design for hydrocarbon entrapment and preservation model within the Anambra Basin. The structural style complexity, lateral and vertical facies changes, and hydrocarbon prospectivity authenticate the oil seepages and gas flare prediction, subsequent petroleum crude oil and gas drilling pathway and exploration and exploitation campaign in the Anambra Basin.