FORMATIVE CONDITIONS OF COMPOSITE HYDROCARBON POOLS IN FENGHUADIAN STRUCTURE OF HUANGHUA DEPRESSION

Fenghuadian structure is an inherited palaeo-structure of long development. Controlled by two major faults of Kongxi and Fenghuadian, various types of oil-gas assemblages were developed in depressions on the both sides. The migration and accumulation were orientated to faultblocks with higher positions, as a result, different types of superimposed composite hydrocarbon pools were formed. There are hydrocarbon pools of buried hill in Mesozoic Anshan rocks, as well as of structural fault blocks in sandstone of Kongdian Formation. This is a typical model of hydrocarbon enrichment in the south of Huanghua depression.