银根盆地查干凹陷火成岩岩相特征及其识别标志

对银根盆地查 干凹陷中广泛分布着的火成岩相和它们在地震剖面上的识别标志进行了研究,探讨了该区火成岩与油气藏的关系,指出了火成岩油气藏的有利区带。该区火成岩岩相类型有爆发相、溢流相、火山颈相及火山沉积相，尤以溢流相最为发育;依据火山岩类通常以地震波速较高、密度大、磁化率高、电阻率大和地震波吸收能量大的特征,建立了4种火山岩岩相和4种侵入岩岩相的地震识别标志。深大断裂控制着火成岩的分布,同时控制着火成岩圈闭的分布。断裂发育带附近是火成岩油气藏勘探的最有利地区。

Characteristics of Igneous Rock Lithofacies and Its Recognition Marks in Chagan Sag, Yin'gen Basin

The igneous rocks occur widely in Chagan sag of Yin'gen basin.This paper presents the study of the igneous rock lithofacies and seismic recognition marks,the discussion of the relations between igneous rocks and oil-gas reservoirs,pointing out the favorable zones of igneous reservoirs.The igneous lithofacies types include explosive facies,overflow facies,volcanic-neck facies and volcano sedimentary facies,of which overflow facies is the most developed.According to the characteristics of the volcanic types such as high seismic wave velocity,high density,high magnetic susceptibility,high resistivity and high absorbability of seismic wave,the seismic recognition marks of four volcanic lithofacies and four intrusive lithofacies are set up.It is concluded that the deep fault controls both distribution of the igneous rocks and distribution of igneous traps.The favorable zones of igneous reservoir prospecting should be near the fault-developed belts.