Abstract：Studies have been made more on the weathering crust reservoirs at the top of buried hills,but less on the law of insider hill reservoirs. In this paper,reservoir conditions and accumulation regulation of Zhuangxi buried hill were discussed from the view point of oil source,tectonic activity on the reservoir,transporting mode,and sealing cap layer. Zhuangxi buried hill has rich oil source provided by Gubei Subsag and Zhuangdong Sag. Reservoir,seal and trap were mainly controlled by folds and faults,thereby complex trap combination was formed,mainly dominated by crack. Oil and gas migrated into the inside storey of buried hill dissolution reservoirs by the way of oil source faults and fold-fracture-cracks. Oil and gas distribution was mainly controlled by the development degree of fracture. Lower Paleozoic reservoirs reconstructed by normal faults especially oil source faults were the favorable directional zones of hydrocarbon migration,and high-yielding reservoirs mainly distributed in seam cave zones formed by reverse-faults footwall strata deflection.

Keyword：Zhuangxi buried hill;fold;fault;Lower Paleozoic;reservoir condition;