CAJ | 학술논문

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发育冲积扇、辫状河、三角洲与湖泊相沉积.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.早一中侏罗世盆地经历了水体由浅到深的沉积演化.
통과암심관찰여측정상분석,결합지진반사자료,인위탑리목분지탑북지구주라계발육충적선、변상하、삼각주여호박상침적.하주라통양하조주요발육충적선화변상하침적.기중충적선주요발육우분지적변연,즉연구구서부적영매력、북부적륜태급기서측、동부적고남지구.충적선암성주요위회백、회록、회갈화자홍색괴상력암、력상사암급함력사암,력석성분복잡,분선차,마원정도저.다개충적선향분지내연화위변상하침적,발육각충교착층리여평행층리,기암성위회색、회백색조사암급함력조사암、세력암,수향상구유비상전형적하조상세적"이원결구",자연전위화자연가마곡선구유명현적상형특정,변상하주체자서향동발육.도양하조침적만기,재초호지구연화위박층세사암여니암호층적호박화함매호소침적;중주라통극자륵노이조위삼각주침적;상주라통보편피박식.조일중주라세분지경력료수체유천도심적침적연화.
According to the core observation and logging facies analysis, combined with seismic reflection, it is considered that alluvial fan-braided fluvialdelta-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 area. The alluvial fan was dominated by the grey, greyly green, greyly brown conglomerates, pebbly coarse-grained sandstones and sandstones which are of multiple composition, poor sorting and poor roundness. Alluvial fans evolved to braided fluvial from the margin to the inner basin. The braided fluvial facies mainly consists of the grey coarse sandstones, pebbly coarse-grained sandstones with various cross bedding and parallel bedding, and fine conglomerates. Vertically, it has an upward fining sequence and box shape on spontaneous and gamma ray well log curves. It developed from west to east. During the later depositional period of the Yangxia Formation, there are lacustrine fine sandstones and lacustrine swamp deposits with coals in Caohu area. The Kezilenuer Formation of the Middle Jurassic is dominated by deltaic deposition. The Upper Jurassic is generally exposed. In the area, the water depth evolved from shallow to deep from the Early Jurassic to the Middle Jurassic.