塔里木盆地西部四十厂剖面志留系柯坪塔格组沥青砂岩沉
积特征
吴立群;焦养泉;荣辉
【期刊名称】《现代地质》 【年(卷),期】2011(025)001
【摘要】Typical bituminous sandstone developed in the upper part of Silurian Kepingtage Formation at Sishichang section in western Tarim Basin, which are located in the middle-lower part of several normal graded sedimentary cycles.Based on the field outcrop section realism, identification under microscope, grain size analysis and X-ray diffraction analysis, detailed study was done on the bituminous sandstone of this section.It was found that bituminous sandstone developed in sand flat and mixed flat, which were in the lower part of intertidal zone in tidal flat depositional system.In bituminous sandstone, fine sandstone and siltstone were most, with typical bidirectional cross bedding and shallow biogenic trace developed.The sediment was transported as saltation form and reformed by tidal action greatly.Most mineral composition was quartz and bioclast, with little clay mineral and feldspar.On this basis, reservoir quality of bituminous sandstone was analysed combined with physical property measurement.It was showed that the quality of feldspar-quartz sandstone with medium compositional maturity was the best, of which the feldspar content was 5％ to 10％ and the quartz
塔里木盆地西部四十厂剖面志留系柯坪塔格组沥青砂岩沉积特征
