The study area

jointly controlled by the NE-trending strike-slip stress and the NS-trending extensional tectonic stress

is located in the northeastern Laizhou Bay Sag

and the southern eastern branch of the Tanlu strike-slip fault zone.Analysis of the fault distribution and structural evolution of the composite stress zone reveals that KL6A block is mainly controlled by extensional stress;that the most favorable trap is faulted anticline formed jointly by the inherited extensional fault controlling traps and the strike-slip transpressional stress;and that the anticline and faulted anticline trap

developed at the strike-slip pressure buildup section of KL6B and KL6C blocks situated in the major strike-slip stress zone

are the most favorable areas for hydrocarbon preservation.Thereafter

we put up an innovative concept of differential reservoir-controlling effect of strike-slip faults

featuring "transpression press-controlled trap

transtension stress-controlled hydrocarbon migration".The transtentional segment of the strike-slip faults serves as the main path for oil-gas migration

making a breakthrough in the exploration of slope areas.In addition

a ternary reservoir-controlling model of "Source-Fault-Trap" is established

and it is believed that the discovered oil-gas reservoirs can act as transfer stations for further migration up to traps of even higher horizons

facilitating the exploration of slope zones.Blocks of hydrocarbon enrichment are discovered in the top traps of the Dongying Formation

which was originally considered to be poor in migration conditions

marking a major breakthrough in oil-gas exploration.