马东油田东南缘沙河街组一段下亚段油气成藏规律

Hydrocarbon Accumulation Regularity in the Lower Member of Es_1 on the Southeast Margin of Madong Oilfield

马东油田东南缘深层油气资源(沙河街组一段下亚段)整体勘探程度低,对于油气成藏要素、油气藏类型及油气分布规律认识尚不明确。通过对该区油气藏分布特征的分析认为,马东油田东南缘主要发育构造油气藏、岩性油气藏以及构造-岩性复合油气藏共3种类型。针对不同的油气藏类型,进行成藏要素及成藏规律的深入研究表明,马东地区古近系以来的构造演化控制了该区的沉积体系、圈闭类型及油气富集规律,现今的油气分布与各成藏要素形成时间及匹配关系密切相关,MD8井区及MD5井区为马东油田东南缘的主要油气富集区。

The overall exploration level was low for deep oil and gas resources in the low member of Es1 on the southeast margin of Madong Oilfield,and the understanding of hydrocarbon accumulation factor,reservoir type and oil and gas distribution was not clear.The analysis of the distribution characteristics of oil and gas reservoirs in this area indicated that three types of oil reservoirs,such as the tectonic reservoir,lithologic reservoir and tectonic-stratigraphic lithologic composite reservoirs were developed.According to different types of reservoirs,in-depth study was carried out on the accumulation factors and accumulation rule,it is found that tectonic evolution controls the sedimentary system,the types of traps and oil and gas enrichment regularity of the area in Madong Oilfield since the paleogene.At present,oil and gas distribution is closely related to forming time of accumulation elements and matching relation between them,it is proposed that the Wellblocks MD8 and MD5 are the main oil and gas enrichment areas in the Southeast Margin of Madong Oilfield.