通古斯盆地油气成藏与控制因素研究

Study on the Hydrocarbon Accumulation and Control Factors in Tunguska Basin

通古斯盆地烃源岩和储、盖层组合发育,主要分为里菲-文德系、中-下寒武统和下-中志留统等三大成藏组合和上古生界煤系含气带。通过对盆地各成藏系统的综合分析认为:通古斯盆地油气分布的主控因素包括构造作用、地层发育特点、暗色岩侵入和烃源岩分布范围。油气成藏模式主要为自生自储式,油气藏类型主要为构造-地层复合型,分布范围在北部、西北部地区,构造上属于靠近克拉通边缘碰撞带的汉泰-布雷宁隆起。

Tunguska Basin develops source rocks, reservoirs and seals, which can be divided in three main plays： Reaphen - Vendian, Lower - middle Cambrian, lower - middle Silurian plays and upper Paleozoic coal and gas-bearing zone. Based on a comprehensive analysis of these play combinations. We believe that the main factors controlling Tunguska Basin＇s oil and gas distribution axe the tectonic and stratigraphic features, trap intrusive and distribution feature of source rocks. The mainly hydrocarbon accumulation mode and play types axe self-generated self-storage and stxatigraphic-stxuctural. Reservoirs mainly distribute in the Kratonic collision edge zone called Khantaysko-Rybinskiy Swell in the north and northwest of the basin.