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渤海湾叠合盆地各构造作用之间普遍存在的沉积间断为潜山的大规模发育创造了有利的条件，按照潜山块体的成因特征，渤海湾东南部济阳坳陷内的潜山可以分为残丘型潜山和断块型潜山，其中断块型潜山是其最主要的类型。济阳坳陷古生代的构造演化为断块型潜山的形成奠定了基础，经过印支期的构造运动和燕山期的断块作用使断块型潜山初具雏形，新生代是断块型潜山形成的重要时期。断块型潜山根据其发育的构造位置的不同，可进一步划分为断阶断块潜山、断脊断块潜山和残丘断块潜山三种亚类，其中断阶断块潜山的成藏潜力最高。济阳坳陷潜山根据油气源的不同，可以分为古生古储、古生中储型油气藏和新生古储、新生中储型油气藏，济阳坳陷的构造演化决定了潜山油气藏的特征以及油气田形成的规模。

Oil and Gas Reservoir Formation Characteristics of Fault-block Buried Hills in Jiyang Depression

There existed generally sedimentary breaks between different tectonic movements in Bohai Gulf Superposed Basin, thus providing favourable conditions for the large-scale development of buried hills. According to the geneses of buried hill blocks, the buried hills in Jiyang Depression being located in the southeast part of Bohai Gulf may be divided into monadnock buried hills and fault-block buried hills, in which the fault-block buried hills are most important. In Jiyang Depression, the Paleozoic tectonic evolution had laid a foundation for the formation of the fault-block buried hills; the fault-block buried hill appeared in an embryonic form after the tectonic movement of Indo-Chinese epoch and the fault-blocking action of Yanshan epoch; and the Cenozoic was the important period of forming the fault-block buried hills. The fault-block buried hills may be subdivided into three subtypes, i.e.fault-terrace, fault-ridge and bornhardt ones in light of their structural portions; in which the reservoiring potential of the fault-terrace fault-block buried hill is the highest one. In Jiyang Depression, the buried hill reservoirs may be divided into four types of oil and gas reservoirs of the Paleozoic source Paleozoic reservoir, Paleozoic source-Mesozoic reservoir, Cenozoic source-Paleozoic reservoir and Cenozoic source-Mesozoic reservoir rocks. The tectonic evolution had decided the characteristics of the buried hill reservoirs and the size of forming oil and gas field in the depression. (Financed by the National Basic Research Program project, No.1999043305 and the Key Technologies Research and Development Program project, No.2001BA605A09)