为研究莱阳凹陷下白垩统莱阳群水南组发育沉积厚度较大的暗色泥页岩的地质特征,观察和测试露头剖面样品和钻孔样品的有机质类型、有机质丰度、有机质成熟度、岩石学特征和孔裂隙等特征.结果表明:水南组暗色泥页岩干酪根类型以Ⅱ型为主;有机碳含量、氯仿沥青"A"与生烃潜量(S1+S2)含量均较高,有机质成熟度较高,总体处于成熟中期,具备较强的生排烃能力;矿物成分以黏土矿物、白云石、石英和长石为主,脆性矿物质量分数可以达到82.3％;孔、裂隙均有发育,具备较多的页岩气储集空间.该研究说明莱阳凹陷水南组暗色泥页岩具有较好的页岩气地质条件.%This paper introduces an investigation into the geological characteristics of dark mudstone and shale of large depositional thickness in lower cretaceous Laiyang Group Shuinan Formation in Laiyang Sag by observing and testing the organic matter type, organic matter abundance, organic matter maturity, petrologic characteristics and pores and fissures of outcrop section sample and drill-hole sample.The results show that organic matter type of dark mudstone and shale in Shuinan Formation which is dominated by type Ⅱ kerogen and is rich in organic carbon, chloroform asphalt "A", and potential hydrocarbon generation amoun (S1+S2), the higher organic matter maturity, is defined as middle maturation and has a stronger ability of hydrocarbon generation and expulsion;the minerals consisting mainly clay mineral, dolomite, quartz and feldspar have brittle mineral content of up to 82.3％;dark mudstone and shale has a large amount of developed pores and fractures providing more storage space to accumulate shale gas.The comprehensive analysis concludes that dark mudstone and shale of Shuinan Formation in Laiyang Sag is blessed with best geological conditions of shale gas.
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