珠江口盆地惠州凹陷珠江组K系列陆架砂脊沉积演化与成因

doi:10.11743/ogg20140312

摘要/Abstract

摘要：

依据地震沉积学和层序地层学基本原理，对珠江口盆地惠州凹陷珠江组上段MFS18.5-SB17.5地层（K层系）进行了高精度层序地层格架划分，共划分出8个砂层或砂层组。通过以层序界面、最大海泛面及次一级海泛面作为约束条件提取地层切片的研究方法，结合钻/测井、岩心和区域沉积背景，在研究区开展精细的地震相和沉积相研究。惠州凹陷珠江组K系列地层主要分布两大沉积体系，西侧为三角洲前缘河口坝-席状砂沉积体系和东南侧为陆架砂脊沉积体系，其中陆架砂脊主要具备以下几个特点：（1）分布在三角洲朵体前端；（2）平行于岸线呈NEE方向，且为条带状展布；（3）向两翼减薄，部分砂脊一翼较厚并具有尖锐边缘，另一翼逐渐变薄，并具有不规则边缘。探讨了这些在陆架上沉积的条带状砂脊成因的机制，指出这些平行于岸线的指状砂脊是三角洲前缘砂受波浪搬运和改造的产物，其在侧向相变为泥岩，是地层岩性油气藏勘探的一个重要领域。

关键词: 三角洲前缘, 陆架砂脊, 珠江组, 惠州凹陷, 珠江口盆地

Abstract:

Based on the principles of seismic sedimentology and sequence stratigraphy,a high resolution sequence stratigraphy framework was established for the MFS18.5-SB17.5(K set)in Huizhou sag of Pearl River Mouth Basin with 8 sand layers or sand groups recognized.Based on the time-slices of seismic attributes under the constraint of sequence boundary surface,maximum flooding surface and the sub-flooding surface,we studied in detail the seismic facies and sedimentary facies in combination with the well logging and drilling data,cores and regional sedimentary backgrounds.Two depositional systems were recognized in K set of Zhujiang Formation in Huizhou sag,namely the river mouth bar of delta front-sheet sand depositional system in the west,and the shelf ridges system in the southeast.The shelf ridges are characterized by the follows:being located in the front of delta lobes;parallel to the coast in NEE direction,and in stripped distribution;and thinning towards to both edges.Some ridges are thick in one limb and having sharp edges,while the other limb thinning gradually and having irregular edges.This paper discussed the formation mechanism of those striped ridges on the shelf,and pointed out that the striped ridges were resulted from transportation and transformation of delta front sands by waves.And they laterally change into mudstone,thus are important domains for exploration of lighologic reservoirs.

Key words: delta front, shelf sand ridge, Zhujiang Formation, Huizhou sag, Pearl River Mouth Basin

中图分类号:

TE121.3

丁琳,张昌民,杜家元,等. 珠江口盆地惠州凹陷珠江组K系列陆架砂脊沉积演化与成因[J]. 石油与天然气地质, 2014, 35(3): 379-385. doi: 10.11743/ogg20140312 Ding Lin,Zhang Changmin,Du Jiayuan,et al. Depositional evolution and genesis of K set of shelf sand ridges in the Zhujiang Formation of Huizhou sag,Pear River Mouth Basin[J]. Oil & Gas Geology, 2014, 35(3): 379-385. doi: 10.11743/ogg20140312

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