【摘要】 以系统取心资料及其分析化验资料为基础,结合测井和地震资料,根据火山岩的岩性、电性、岩石化学等特征和不同岩性岩相的地震反射特征,将三塘湖盆地马朗凹陷牛东地区卡拉岗组火山岩地层划分为层、韵律、期次、亚旋回等不同单元。以期次(层组)作为该区火山岩地层划分对比的基本单元,这也是在地震剖面上能识别和连续追踪的基本或最小地层单位,并对该区火山岩地层进行了划分与对比。研究表明:该区卡拉岗组火山活动以裂隙式喷发为主,分布规律表现为层组的厚度、数目由西南向东北呈明显的减薄(少)趋势;牛东地区卡拉岗组已经揭示的火山岩厚度在1000 m以上,可以划分为8个火山期次,4个亚旋回。更多还原

【Abstract】 Based on the systemic coring data and analysis test data,combined with well logging and seismic data,and according to the characteristics of lava lithology,electrical property,petrochemistry and so on,along with the seismic reverberation of different lithology and lithofacies,volcanic strata of Kalagang Formation in Niu-dong area in Malang sag of Santanghu basin can be divided into different units,such as layer,cyclothem,period,and sub-gyration.Regarding volcanic eruptible period as the basal unit of lava stratigraphic division and correlation,the lava stratigraphic division and correlation in this area has been done.The study indicates that fracture eruption is the main eruptible mode in Kalagang Formation.Volcanic distribution reveals that the thickness and number of the volcanic layer decrease distinctly from southwest to northeast.Kalagang Formation has the thickness of more than 1,000 meters and can be divided into eight sub-volcanic eruptible periods and four sub-gyrations.更多还原