塔里木盆地塔北地区侏罗系沉积特征及演化

通过岩心观察与测井相分析，结合地震反射资料，认为塔里木盆地塔北地区侏罗系为冲积扇、辫状河、三角洲与湖泊沉积体系。下侏罗统阳霞组主要发育冲积扇和辫状河沉积。其中冲积扇主要发育于盆地的边缘，即研究区西部的英买力、北部的轮台及其西侧、东部的库南地区。冲积扇岩性主要为灰白、灰绿、灰褐和紫红色块状砾岩、砾状砂岩及含砾砂岩，砾石成分复杂，分选差，磨圆程度低。多个冲积扇向盆地内演化为辫状河沉积，发育各种交错层理与平行层理，其岩性为灰色、灰白色粗砂岩及含砾粗砂岩、细砾岩，垂向上具有非常典型的下粗上细的 “ 二元结构” ，自然电位和自然伽马曲线具有明显的箱形特征，辫状河主体自西向东发育。到阳霞组沉积晚期，在草湖地区演化为薄层细砂岩与泥岩互层的湖泊和含煤湖沼沉积；中侏罗统克孜勒努尔组为三角洲沉积；上侏罗统普遍被剥蚀。早-中侏罗世盆地经历了水体由浅到深的沉积演化。

Sedimentary characteristics and evolution of the Jurassic in northern Tarim Basin

According to the core observation and logging facies analysis, combined with seismic reflection, it is considered that alluvial fan-braided fluvial-delta-lacustrine sedimentary facies were developed in the Jurassic in Tabei area, Tarim Basin. The alluvial fan and braided fluvial facies were mainly developed in the Yangxia Formation of the Lower Jurassic. The alluvial fan was mainly developed along the margin of the basin, such as Yengimahalla in western area, Luntai in northern area and Kunan in eastern are...