盘古梁长6油层组高分辨率层序地层分析对比

Analysis of high-resolution sequence stratiggraphy of Chang-6 Oil Reservoir Set

用高分辨率层序地层学的理论和方法,对鄂尔多斯盆地中部志丹县盘古梁长6油层组进行了研究,并对其作了长期、中期、短期基准面旋回的划分。结果表明,长6油层组可识别的短期旋回类型,有向上变深的不对称旋回两种,向上变浅的不对称旋回一种;中期的基准旋回可识别出7个,长期的基准面旋回有3个。最后对基准面旋回对比与传统的沉积旋回对比的方法、过程、分界面的选取标准、对比结果之间的差异及优劣进行了探讨。

The sedimentological characteristics of Chang-6 Oil Reservoir Set in the centre of Ordos Basin are studied, taking the theory and technique of high-resolution sequence stratigraphy, and three grade base-level cycles can be identified, such as short-term, middle-term and long-term. The short- term cycles can be recognized including two kinds of dissymmetry cycles, being deeper upwards and a dissymmetry cycles which becoming shallower upwards. Then seven middle-term cycles and three long-term cycles can be recognized. Fttrthennore, the paper discusses the differences between base-level cycle and sedimentary cycle comparison methods from such aspects as correlation process, method, cycle interface standard and result.