The Liaoxi low salient in Bohai presents clear structural segmentation characteristics and can be divi-ded into southern

middle

and northern parts.The buried hills there present a typical structural style of tilting fault-block and a three-layer architecture consisting of the Archaean metamorphic rocks

Cambrian-Ordovician carbonates

and Mesozoic volcanic rocks.Hydrocarbon accumulations in the buried hills of Liaoxi low-salient are mainly determined by two factors:development of reservoirs in the Paleogene and abundance of hydrocarbon resources in the Liaozhong sag.Therefore

large-scale hydrocarbon accumulations in buried hills occur mostly in circumstances that hydrocarbon supply from the main fault-troughs is plentiful and high-quality reservoirs are absent in the Paleogene.