滨里海盆地TKW油田油气成藏模式

Hydrocarbon accumulation mode of TKW oilfield in the Pre-Caspian basin

在分析研究本区石油地质特征的基础上,围绕盐窗和盐构造这两个影响盐上油气成藏的关键因素,建立了本区三叠系油藏"盐下生成、盐窗沟通、盐边盐间输导、盐檐聚集、后期保存"的成藏模式。本区南北两个巨大的盐窗为三叠系油气的富集提供了物质基础;三叠系末期形成的南北两个盐檐部位的断鼻、背斜构造带位于油气运移的主要路径,储盖配置良好,侧向遮挡条件具备,后期保存条件好,应是首选的勘探目标区。

Based on the analysis of the petroleum geological features of TKW oilfield and focusing on the two key factors——salt window and salt structure that can affect the post-salt reservoir formation,this paper put forward the hydrocarbon accumulation mode——pre-salt generation,salt window communication,inter-salt transmission,salt eaves accumulation and later preservation for the Triassic system reservoirs in TKW oilfield.The two giant salt windows of south and north provide material base for the gath ering of Triassic system oil gas.Formed at the salt flank in late Triassic,the fault nose and anticline tectonic zones in the two salt edges of south and north are just located in the oil gas migration pathway and should be the first choice of exploration target be cause of their good conditions of covering,side sheltering and later preservation.