沉积残留物:确定隐蔽圈闭时需要强调和重视的一个概念

Depositional Remnants: a Term That Needs to Be Highlighted When Confirming Subtle Traps

沉积残留物是指原始沉积体系的沉积物在沉积后受到侵蚀,普遍意义上指沉积的准同时受到侵蚀而保留下来的那部分残留物。沉积残留物可形成于沉积物未固结时,因而会与高级别的层序边界和水进不整合,与低级别的层序边界不整合伴生。强调沉积残留物是准确确定原始沉积,避免误解沉积分布,有效地指导隐蔽圈闭的勘探和开发。

Depositional remnants is a stratigraphic term put forward and elaborated systematically by R.S. Martinsen etc. And the term means a sedimentary deposit that is only part of an original depositional system preserved after subsequent, but commonly penecontemporaneous erosion. Consequently, the depositional remnants may form while the deposits are still unconsolidated and so it may develop in association with high-order sequence-bounding and transgressive unconformities as well as low-order sequence-bounding unconformities. This paper argues that depositional remnants is beneficial to accurate confirmation of original deposits, avoiding of making mistakes in sedimentary distribution, effective guiding of the subtle-trap exploration and development. Thus the term should be highlighted by petroleum geologists.