合肥盆地形成机制与油气勘探前景

合肥盆地是与大别造山带同因同期形成的山前前陆盆地,在发育过程中盆地东部受郊庐断裂影响较大。盆地基底为华北板块的南缘,岩性主要由古生界组成,沉积盖层发育较全,厚达12000m。是一个中、新生代陆相沉积盆地。该盆地共划分4个一级构造单元,形成“三坳围一隆”的构造格局。主要大断裂4条,南倾、东西走向,横贯全盆,其性质为先逆后正的转换断层。该盆地形成∈-O、C-P、J1-2、K1-2、E五套烃源岩,中央隆起是油气的主要指向,是一个勘探潜力较大的含油气盆地。

THE FORMATION MECHANISM OF THE HEFEI BASIN AND ITS OIL AND GAS EXPLORATION PROSPECT

The Hefei Basin is a synorogenic foreland basin with the Dabie orogen. The eastern part of the basin was considerably in- fluenced by the Tanlu Fault during its development. The basement of the basin is the southern edge of the North china Plate, which lithologically consists of the Palaeozoic. As a Mesozoic and Cenozoic terrestrial facies sedimentary basin its cover is well developed with a thickness of 12000m. The basin is divided into four first - class tectonic units, forming a framework of "three deperssions sur- rounding one rise". Four transbasinal major faults are EW - trending and south - dipping transform faults which are shown as the re- verse followed by the normal. There are five suites of hydrocarbon source rocks such as the C - P, J_1-2, K_1-2 and E in the basin. The central uplift is the major indicator of oil and gas. So it is an oil and gas- bearing basin with great potential in exploration.