高邮凹陷辉绿岩变质带储集条件分析

高邮凹陷辉绿岩分布广泛,辉绿岩附近的泥岩常形成变质带。岩心、测井和分析测试资料表明,泥岩变质带岩石类型以板岩和角岩为主,孔缝发育,尤以角岩孔渗性好,平均孔隙度13.4%,渗透率为1885.4×10-3μm2,为低孔高渗储层。距离辉绿岩越近,变质程度越高,变质带储集性能就越好。高邮凹陷辉绿岩变质带具备较好的油气成藏条件,具有良好的勘探前景,对高勘探成熟区,加强这种新类型油气藏的勘探,是扩大油气勘探领域的新思路。

Analysis of reservoir condition of mudstone metamorphic zone near diabase in Gaoyou Sag

In Gaoyou Sag, diabase is widespread, where the mudstone usually came into being metamorphoses. Based on analysis of core samples,well logging, and other test data, rock types of mudstone metamorphic zone are mainly slate and hornstone with more pores and fractures, especially hornstone, which can form favorable reservoir with low average porosity of 13.4% and high average permeability of 1 885.4 ×10^-3μm2. The more recent to diabase is, the higher degree of metamorphism is, and the better reservoir properties of metamorphic zone is. The diabase metamorphic zone in Gaoyou Sag has favorable reservoir accumulation conditions and good prospects of oil exploration. In high degree exploration area, it＇ s a new way to enhance the exploration of this new type of trap.