中国石油大学学报（自然科学版）2017，Vol.41Issue(5)：9-19,11.DOI:10.3969/j.issn.1673-5005.2017.05.002
陆丰地区古近系恩平组沉积演化特征及沉积模式
Sedimentary evolution characteristics and sedimentary model of Paleogene Enping Formation, Lufeng area, Pearl River Mouth Basin
摘要
Abstract
Based on core observations and data from seismics drilling and well logging as well as slice, the sedimentary char-acteristics of the Enping Formation in Lufeng area of the Pearl River Mouth Basin were studied. The sedimentary models have been established by combining information from construction background and paleo-geomorphology. The study shows that four 3rd-order sequences were developed in the rift stage periodsⅡ(Enping Formation) in Lufeng area, which mainly compose of three types of sedimentary facies, namely, fan delta, braided river delta and lacustrine. In the early sedimentary stage of En-ping Formation, three separated depressions were formed. The fan delta was formed in the fault steep slopes, and the braided river delta in the gentle slope. During the middle stage of depositional progress, with active intensity of main-controlled fault enhancement from south to north, the subsidence center and depocenter gradually migrated to north. The main provenance experienced internal uplifts of the basin and the transition of Dongsha Massif to the northern uplift belt, characterized as broad distributed braided river delta and beach bar. During the late stage of sedimentary progress, with a weak main-con-trolled fault activity, the lacustrine basin became smaller. Progradational braided river delta and thin coal seam developed af-terwards. The activity of the main-controlled fault provides the accommodation space for the deposits, and controls the geo-metric shapes of depressions. The first-order fault transfer zones control the orientation of the main provenance, while the secondary ones carve its channels, influencing the redistribution of sand. The development of the sedimentary system and the distribution of sands are closely related to paleo-geomorphology. In the study area, beach bar is the most favorable reservoir facies belt,followed by underwater braided channel and mouth bar deposits of the fan delta front, and the underwater distribu-tary channel and mouth bar deposits of braided river delta front.关键词
断陷湖盆/沉积相/沉积模式/恩平组/陆丰地区/珠江口盆地Key words
rifted lacustrine basin/sedimentary facies/depositional model/Enping Formation/Lufeng area/Pearl River Mouth Basin分类
能源科技引用本文复制引用
焦鹏,郭建华,张向涛,刘辰生,郭祥伟,王玺凯..陆丰地区古近系恩平组沉积演化特征及沉积模式[J].中国石油大学学报（自然科学版）,2017,41(5):9-19,11.基金项目
国家科技重大专项(2011ZX05023-001) （2011ZX05023-001）
中国海洋石油总公司综合科研项目(YXKY-2015-SZ-02) （YXKY-2015-SZ-02）
