荔湾凹陷恩平组水道—浊积扇体系沉积演化
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摘要
应用地震资料对珠江口盆地荔湾凹陷恩平组地层进行地震相分析,恢复其古地貌,并结合浅层井-震对比分析,在该区发现了一个大型水道—浊积扇体系。研究结果表明:水道在平面上呈"蛇"型沿NW—SE方向展布,受物源和古地形等因素的影响,水道不同区段的剖面形态与沉积演化特征不同,上段呈现"V"型,向中、下段逐渐转变为"U"型或"W"型;根据地震反射特征将该水道—浊积扇体系划分为3期,每期水道内部发育次级小水道。早期水道以侵蚀作用为主,中期水道以侵蚀-沉积共同作用为特征,晚期水道基本为沉积作用,而且中—晚期水道广泛发育天然堤-溢岸沉积,属于典型的侵蚀-沉积型水道。分析认为,其物源来自白云凹陷北部的三角洲。该深水扇体系的发现为深水区深部地层大型储集体的寻找及油气勘探提供参考。
Seismic data is used to analyze the seismic facies and restore the palaeogeomorphology of Enping Formation in Liwan Depression,the Pearl River Mouth Basin. Seismic-well combination comparison and analysis indicate a large-scale channel-turbidite fan system. Research shows that the channels with"snake"distribution spread along NW-SE direction. Due to the influences of provenance,palaeogeomorphology and other factors,the channels show various cross-section morphologies and sedimentary evolution properties in different sections,namely"V"type in the upper section and"U"or"W"type in the middle-lower section. This channel-turbidite fan system is classified into 3 stages with development of secondary sub-channels within each channel. The early channel is dominated by erosion,channel in the middle stage is featured by joint effects of erosion-deposition and late channel is dominated by deposition. Natural levee-overbank deposition develops in mid-late channel,which is considered as erosion-deposition channel. According to the analysis,its provenance comes from the delta in northern Baiyun Depression. The discovery of this deep-fan system could provide certain reference for the discovery and hydrocarbon exploration of large-scale reservoirs in deep formations of deep-water area.
Seismic data is used to analyze the seismic facies and restore the palaeogeomorphology of Enping Formation in Liwan Depression,the Pearl River Mouth Basin. Seismic-well combination comparison and analysis indicate a large-scale channel-turbidite fan system. Research shows that the channels with"snake"distribution spread along NW-SE direction. Due to the influences of provenance,palaeogeomorphology and other factors,the channels show various cross-section morphologies and sedimentary evolution properties in different sections,namely"V"type in the upper section and"U"or"W"type in the middle-lower section. This channel-turbidite fan system is classified into 3 stages with development of secondary sub-channels within each channel. The early channel is dominated by erosion,channel in the middle stage is featured by joint effects of erosion-deposition and late channel is dominated by deposition. Natural levee-overbank deposition develops in mid-late channel,which is considered as erosion-deposition channel. According to the analysis,its provenance comes from the delta in northern Baiyun Depression. The discovery of this deep-fan system could provide certain reference for the discovery and hydrocarbon exploration of large-scale reservoirs in deep formations of deep-water area.
引文
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[3]林闻,周金应.世界深水油气勘探新进展与南海北部深水油气勘探[J].石油物探,2009,48(6):601-605.
[4]周蒂,孙珍,陈汉宗.世界著名深水油气盆地的构造特征及对我国南海北部深水油气勘探的启示[J].地球科学进展,2007,22(6):561-572.
[5]翟光明,王世洪,何文渊.近十年全球油气勘探热点趋向与启示[J].石油学报,2012,33(增刊1):14-19.
[6]CHEN W.Status and challenges of Chinese deepwater oil and gas development[J].Petroleum Science,2011,8(4):477-484.
[7]赵喆,张光亚,梁涛,等.2012年世界油气勘探新发现及发展趋势[J].天然气地球科学,2014,25(1):39-44.
[8]李云,郑荣才,高博禹,等.南海深水扇沉积研究现状和展望——以珠江口盆地白云凹陷珠江深水扇系统为例[J].地质论评,2010,56(4):549-560.
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