NEOGENE HYDROCARBON MIGRATION AND INSPIRATION IN THE GENTLE SLOPE BELT, SOUTHERN BOHAI SEA: A CASE FROM KENLI 9 OILFIELD GROUP

Oil and gas accumulation in gentle slope belt is under the control of remote source model in which migration conditions play key roles. Based on the abundant data from the Kenli 9 oilfield, using physical simulation and geochemical approaches, study on the hydrocarbon migration model on gentle slope is carried out and the accumulation-controlling factors are studied in this paper. It is concluded that the sandy member on the top of Guantao Formation and the muddy member on the bottom of Minghuazhen Formation made up the lateral migration passage; regional accumulation on the slope was determined by the traps on the top of passage and the hydrocarbon transfer stations; fractures were not developed in poorly consolidated- unconsolidated rocks, and vertical migration capability was related to the sandstone near the fault zone rather than the activity intensity; reservoirs in the Minghuazhen Formation were controlled by lateral and vertical migrations. Under the guidance of the new results, great success has been achieved in the shallow hydrocarbon exploration on Penglai A structure, which proved the accuracy of the new model.