甘肃及邻区中小盆地油气地质特征及资源潜力分析

Characteristics of petroleum geology within middle and small basins and their resource potentials in Gansu and its adjacent regions

依据甘肃及邻区各中小型盆地发育的构造背景、后期构造演化特征及其空间分布规律,将其划分为盆地群,分析了各盆地群的油气地质特征,分层系对各盆地(群)油气资源量、油气远景进行了估算与评价．结果表明,油气资源主要来自石炭系、侏罗系、白垩系3大层系,全区总资源量为46．64×108t．研究认为,研究区围绕上述3套烃源岩系具有各自的重要勘探战场,相当一部分盆地具有良好的油气勘探前景．

Gansu and its adjacent regions are situated in the linking zone of several large tectonic units distributed in the western China, where there are a number of mid- to small-sized basins. Based on the tectonic background, later tectonic evolution and spatial distribution of the basins, this paper divides the numerous mid- to small-sized basins into basin groups and then thoroughly discusses their petroleum geology. Meanwhile, the paper also estimates the resource quantity of individual basin group by different strata and assesses their oil and gas potentials, with the conclusion that oil and gas resources are mainly from Carboniferous, Jurassic and Cretaceous strata and the total resource quantity was 46.64×10^10 ton. The above-mentioned three sets of source rocks will form their own exploration fields, among which a considerable part of those basins is of excellent prospects.