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塔北地区石炭系砂泥岩段发育良好,该地区在经历了中泥岩段-标准灰岩段-上泥岩段泻湖相-台地相泥岩和灰岩沉积后,在石炭系砂泥岩段沉积期间发生了较大规模的海退,砂岩和砂砾岩沉积物重新出现在塔北地区。塔北地区砂泥岩段可以划分为两个大的沉积旋回,下旋回由砂泥岩段下亚段的S3~S2砂组组成,为海退沉积层序,上旋回由砂泥岩段上亚段的S1砂组组成,为海侵沉积层序。沉积相分析表明塔北地区砂泥岩段主要是在泻湖-潮坪-三角洲区域沉积背景下的沉积物,但不同地区沉积环境、沉积演化和砂体分布存在较大差异。
The Carboniferous sandstone and mudstone section in Tarim Basin is well developed. After the lacustrine facies-platform mudstone and limestone sediments in the middle mudstone section-standard limestone section-upper mudstone section have been well developed in this area, during the deposition of the Carboniferous sandstone and mudstone section Large-scale regression, sandstone and glutenite sediments reappear in northern Tarim. The sandstone-mudstone section in Tabei area can be divided into two large sedimentary cycles. The sub-cycles are composed of the S3 ~ S2 sand group in the lower sub-section of the sand-shale section, which is a regressive sedimentary sequence. The upper cycle is composed of the upper sub-section of the sand-shale section S1 sand formation, transgressive sedimentary sequence. Sedimentary facies analysis shows that the sand-mudstone section in the northern Tarim basin is mainly sediments in the sedimentary background of the lagoon-tidal flat-delta region, but there are great differences in sedimentary environment, sedimentary evolution and sand body distribution in different areas.