鄂尔多斯盆地西南部延长组长7段重力流沉积特征

The Gravity Flow Deposits in Chang Member7 Yanchang Formation of Southwest Ordos Basin

根据重力流的沉积理论,利用岩心、测井等资料,探讨鄂尔多斯盆地西南部延长组长7段重力流的沉积特征及其成因,并结合试油结果讨论重力流的地质意义。该区重力流沉积物可分为砂质碎屑流沉积物、液化流沉积物、滑塌岩和浊积岩,其中浊积岩最为发育。构造事件、沉积物力学平衡的破坏是形成该区重力流的主要原因,流体性质的变化促使了不同类型的重力流沉积的形成。

This thesis focuses on the analysis of the sedimentary structure characteristics of gravity flow and the fac- tors of gravity flow deposits in Chang member7 Yanchang formation southwest Ordos Basin and combined with the logging data and the result of the oil test it emphasized the petroleum geological significance of gravity flow. The gravity flow deposits of the area can be divided into slump rock, sandy debris sediment flow, liquefaction flow, and turbidite. Tectonic events and the destruction of the balance of sediment mechanics are the factors for the formation of gravity flow, while changes in fluid properties form different types of gravity flow deposits