塔里木盆地中部二叠系火山岩地层的划分与对比

根据火山岩的岩性及电性特征,对塔里木盆地中部(简称塔中)地区下二叠统火山岩地层进行了划分与对比。结果表明,以岩流组作为该区火山岩地层划分对比单元,确定了塔中地区西部有6期火山喷发,中部有4期火山喷发,东部无火山喷发。该区二叠纪火山以断裂式喷发为主,火山活动由西北向东南逐渐减弱。火山通道和伴生裂缝是油气运移的良好通道。塔中地区二叠系火山岩油气藏类型有古潜山型和超覆披覆型。

Classification and correlation of Permian volcanic rocks in Mid-Tarim area

On the basis of lithological characters and electricity of volcanic rock, the volcanic rocks in Permian strata in Mid-Tarim area were divided into distinct units of lava cell and lava group. Taking lava group as an essential unit for compartmentalizing and contrasting volcanic rock stratum, the classification and correlation of volcanic rock strata show that volcanic movement in the central Tarim area became weak from north-west to south-east. There occurred six times of volcanic eruptions in the west part, four times in the middle part and none in the east part. The main types of igneous reservoirs of Permian in the central Tarim area include the overlapping and draping type and uplifting leaching type.