screenscreen pipescrew down valvesea bed samplingsea water ballastsea water mudsea water pumpseabedsealoading lineseamseamless casingseamless pipeseawater deoxygenation columnsecondary anticlinesecondary exploitationsecondary fieldsecondary migrationsecondary permeabilitysecondary recovery methodsecondary reservessecondary rocksecondary waterseconfary intersticesectional hutsecundary porositsedimentary depositsedimentary fieldsedimentary overlapsedimentary reservoir rocksedimentological conditionsseepseepage oilseismic methodseismic reflection methodseismic refraction methodseismogramseismographseismometerseismometer spacingseismometer spreadselective corrosionselective gamma gamma loggingselective spectrometric gamma gamma loggingselective spontaneous potentialselective water injectionself contained platformself elevating platformself elevating platform jacketself elevating production platformself potential log