STUDY OF JURASSIC STRATIGRAPHIC SEQUENCE AND SEDIMENTARY FACIES IN NORTH OF QAIDAM BASIN
STUDY OF JURASSIC STRATIGRAPHIC SEQUENCE AND SEDIMENTARY FACIES IN NORTH OF QAIDAM BASIN
复制标题
柴达木盆地北部侏罗系地层层序与沉积相研究
作者：
Yang Yong
以冷科1井为例，从钻井和露头的生物地层学划分入手，以地层层序理论为基础，对柴达木盆地北部侏罗系地层进行了地震建造追踪识别，研究了侏罗系地层的地震相和沉积相，探讨了地层格架中的烃源岩和储集层特征。地层研究结果表明，侏罗系地层可划分为5个层序和11个体系域。下侏罗统由扇三角洲、半深湖和深湖相2个层序组成。中侏罗统由1个层序组成，主要包括河流相和沼泽相。上侏罗统由两个层序组成，分别为浅湖相、湖滨相和河流相。下侏罗统和中侏罗统含烃源岩。侏罗系砂岩在该区分布广泛，可作为良好的储集层，部分储集层为良好的储集层。
From biostratigraphic classification of drill and outcrop, specially like Lengke 1 well, and based on theory of stratigraphic sequence, the authors trace and identify seismic formation of the Jurassic stratum in North of Qaidam Basin, research seismic facies and sedimentary facies of Jurassic stratum and discuss the characteristics of hydrocarbon source rocks and reservoirs in stratigraphic framework. The stratum results show that the Jurassic stratum can be divided into 5 sequences and 11 system tracts. The Lower Jurassic consists of 2 sequences which include fan delta, semi deep lake and deep lake facies. The Middle Jurassic consists of 1 sequence which includes mainly fluvial facies and paludal facies. The Upper Jurassic consists of 2 sequences, which include shallow lake, lake shore and fluvial facies. The Lower and Middle Jurassic contain the hydrocarbon source rock. Jurassic sandstone is widely distributed in the area, and can be excellent reservoirs for gas, partly good reservoirs for oil.