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大情字井地区青山口组第三段沉积时期发育陆相水退三角洲体系,由于不同相带层序类型的差异,造成三角洲平原与三角洲前缘测井曲线形态差异极大,以测井曲线标志层分析为主的小层对比较难实现全区对比的统一。岩芯分析表明,三角洲平原由于可容纳空间最低,沉积物以过路冲刷作用为主,受基准面升降的控制作用不明显,形成以上升半旋回为主的短期旋回组合;三角洲前缘受基准面升降的控制作用明显,在基准面下降期间形成相对完整的进积层序。通过分析不同相带层序组合与基准面的变化关系,总结出4种不同级次旋回的组合类型,以此确定不同相带不同级次旋回的对比关系,建立划分方案,实现旋回对比。研究认为,不同相带可容纳空间的不同导致研究区不同区域基准面旋回样式的差异是造成旋回对比困难的主要原因,通过不同相带的环境—沉积分析,总结不同相带旋回组合样式,以此确定对比关系是不同相带旋回进行对比的有效手段。
Due to the difference in sequence types of different facies belts, the logarithm of the delta front and delta front has a great difference in shape, and the log of the logging curve Analysis of the main comparison of the more difficult to achieve the unity of the region. The core analysis shows that the delta plain is dominated by overpass erosion due to the lowest accommodation space and the short-term cycle-dominated combination of short-term cycles due to the uncontrolled rise and fall of the reference plane. The delta front is affected by the reference plane The control effect of the lift is obvious, forming a relatively complete precession sequence during the fall of the reference plane. By analyzing the relationship between the sequence stratigraphy and datum, the paper summarizes the types of combinations of four different levels of cycles to determine the contrast between the different levels of different cycles, and establishes the splitting scheme to realize the cycle comparison. The study shows that the difference in the accommodation space of different facies belts leads to the difference of the basement surface cycle patterns in different regions of the study area, which is the main reason for the difficulty of the cycle comparison. Based on the environment-sediment analysis of different facies belts, This determination of contrast is an effective means of contrasting different facies cycles.