中石油探区主要盆地页岩气资源分布特征研究

Distribution of shale gas resources in CNPC exploration area

页岩气是重要的非常规天然气资源类型。中国页岩发育广泛,有着良好的页岩气勘探前景。在新一轮油气资源评价的基础上,对中石油探区主要盆地泥页岩特征和页岩气资源进行了初步评价。总体上,中-新生界页岩在中石油探区各主要含油气盆地内广泛发育,以陆相沉积为主,具有东部生油能力强,西部生气能力强的特征;古生界页岩主要发育于中、西部盆地和南方地区,以海相沉积为主,具有高热演化程度的特征。通过成因法、统计法、特尔菲法计算,最终确定中石油探区内主要页岩气盆地地质资源量及分布特征。在平面上,页岩气资源主要分布在西部盆地、中部盆地和南方地区,以塔里木盆地、柴达木盆地、四川盆地、鄂尔多斯盆地和南方页岩发育区为最有利勘探区;在剖面上,页岩气资源主要集中在上述盆地的古生界地层,四川盆地的中—新生界地层也是值得重视的勘探领域。

Shale gas is an important type of unconventional gas resources.China has widespread shale development and expectable shale gas exploration prospect.On the basis of the last national petroleum resources assessment,shale gas characteristics and resources are preliminarily evaluated for the main basins in CNPC exploration area.Generally,Meso-Cenozoic shale had developed widely in CNPC exploration area,mainly in continental deposit.The shale in the east had generated more oil and in the west generated more gas.Palaeozoic shale had developed mainly in the central and western basins and in south China,mostly in marine deposit,showing high degree of thermal evolution.The resource extent and distribution of shale gas in the main basins of CNPC exploration area are determined through means of genetic method,statistical method and Delphi method.Horizontally,shale gas distributes in the western and central basins and south China,with favorable exploration zones such as Tarim Basin,Qaidam Basin,Sichuan Basin and Ordos Basin,as well as south China;vertically,shale gas mainly exists in the Palaeozoic of these basins,and the Meso-Cenozoic in the Sichuan Basin is also noteworthy for shale gas exploration.