STUDY ON PALAEOGENE SYNDEPOSITION AND ITS RELATION WITH HYDROCARBON POTENTIALS IN JIYANG SAG

Due to the multi-period tectonic movement and evolution of mechanical mechanism, syndeposition structures occur extensively in Jiyang Sag, the base of the sag subsided alternatively during the fault depression, which resulted in sinking of top bending and complicated block structure accordingly, reconstructed the syndeposition intensively, and produced the special structural landscape in combination with all levels of faults and sedimentary formations within it. Syndeposition developed in Jiyang Sag can be classified, mainly based on gravity and the form of sinking, into syndeposit-anticline and syndeposit-nosing structure during the formation and development period. By taking into account of the reservoir formation, syndeposition on the one hand can play the transportation role in migrating the source rock, and on the other hand lead to favorable matching relations among source rock, reservoir rock and cap strata.