鄂尔多斯盆地马家滩油田延长组油气成藏规律研究

Hydrocarbon accumulation in the Yanchang Formation, Majiatan Oil Field,Ordos Basin

本文以油气成藏的基本理论为指导,以测井、录井、分析测试等资料为依据,结合前人的研究成果,对鄂尔多斯盆地马家滩油田延长组的油气来源、储集条件、盖层条件、油气运移、圈闭形成与分布等油气成藏的基本条件进行分析研究。研究表明,长7油层组为马家滩油田最主要油气来源,长10油层组为其主要储集层,长10油层组顶部泥岩为主要盖层。马家滩油田断层发育,断层圈闭为主要圈闭类型,断层油气藏为该地区主要油气藏类型。有机质生烃作用作为油气运移的主要动力来源,断层为油气主要垂向运移通道。马家滩油田具有3大有利勘探区块,即马家滩、古峰庄、马儿庄-于家梁勘探区块,可作为未来的勘探方向。

The present paper deals, in terms of well logs and analytical results, with the source rocks, reservoir rocks, cap rocks, hydrocarbon accumulation and migration, trap formation and distribution in the Yanchang Formation, Majiatan Oil Field, Ordos Basin. The Chang-7 oil measures occur as the main source rocks, the Chang- 10 oil measures as main reservoir rocks, and the topmost mudstones of the Chang-10 oil measures as the main cap rocks in the Majiatan Oil Field. The fault-controlled oil traps act as the main traps. The fault-controlled oil reservoirs are believed to be the main oil reservoir type in this region, and the faults appear as the good pathways for the hydrocarbon migration. The prospect areas include the Majiatan, Gufengzhuang and Ma＇ erzhuang- Yujialiang zones in the Majiatan Oil Field.