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尼日尔三角洲盆地深水沉积研究是目前世界油气勘探的热点问题之一.通过对三维地震资料、岩心及测井曲线分析,揭示了尼日尔三角洲盆地南部地区新近系深水沉积体系特征.基于不同属性的层序界面识别,研究区划分出SQ1-SQ6共6个三级层序,并建立层序地层格架,进而总结出研究区深水沉积模式.研究区除堆积正常半深海-深海泥岩外,还广泛发育海底扇沉积,海底扇由浊积水道和海底扇朵体组成,其中水道分支少、弯度大,外部形态类似曲流河;朵体平面上成朵叶状分布,可以划分为末端朵体和决口扇朵体.研究区新近系地层自下向上由老到新,相对海平面先下降再上升,SQ1-SQ4层序以海底扇朵体沉积为主,SQ5-SQ6层序以浊积水道沉积为主.
The study of deep-water sediments in the Niger Delta basin is one of the hot topics in the field of hydrocarbon exploration in the world.Through the analysis of 3D seismic data, core and well logging curves, the characteristics of the Neogene deep water sedimentary systems in the southern Niger delta basin are revealed.According to the sequences of different attributes In the study area, a total of 6 third-order sequences of SQ1-SQ6 are identified, and the sequence stratigraphic framework is established, and then the deep-water sedimentary model of the study area is concluded.The research area is extensively developed except for the accumulation of normal semi-deep-sea mudstone Submarine fan deposition, submarine fan by the turbid waterway and submarine fan body composition, of which less waterway branch, camber, external shape is like a meandering river; flower body plane into a blossoming, can be divided into the end of the body and In the study area, the Neogene strata in the study area changed from old to new from bottom to top, and the relative sea level first descended and then rose. The SQ1-SQ4 sequence was dominated by the submarine fan and the SQ5-SQ6 sequence was turbiditated Sediment-based.