天然气地球科学

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珠江口盆地白云凹陷北坡恩平组上段三角洲物源演化及储集意义

郭帅,陈莹,曾清波,杨海长,韩银学,纪沫,沈怀磊,郭佳,赵钊   

  1. 中海油研究总院, 北京 100028
  • 收稿日期:2017-05-23 修回日期:2017-07-04 出版日期:2017-10-10 发布日期:2017-10-10
  • 作者简介:郭帅(1987-),男,山东夏津人,工程师,硕士,主要从事石油地质综合研究.E-mail:guoshuai@cnooc.com.cn.
  • 基金资助:
    国家科技重大专项“南海深水区油气资源潜力与大中型油气田勘探方向”(编号:2017ZX05026-007);国家自然科学基金“南海深海地质演变对油气资源的控制作用”(编号:91528303)联合资助.
     

Provenance evolution of delta and the effects on reservoir quality in sandstones of theupper Enping Formation in the north of Baiyun Sag,Pearl River Mouth Basin

Guo Shuai,Chen Ying,Zeng Qing-bo,Yang Hai-zhang,Han Yin-xue,Ji Mo,Shen Huai-lei,Guo Jia,Zhao Zhao   

  1. CNOOC Research Institute,Beijing 100028,China
  • Received:2017-05-23 Revised:2017-07-04 Online:2017-10-10 Published:2017-10-10

摘要:

珠江口盆地白云凹陷北坡恩平组上段三角洲煤系及与其相关的陆源海相泥岩是该地区已经获得勘探证实的主要烃源层系。根据地震剖面及钻井资料,该三角洲可以分为3期。稀土元素结合区域基底岩性特征表明,恩平组上段第Ⅰ期三角洲物源区为番禺低隆起,供源河流表现为近物源的辫状河特征;恩平组沉积晚期,恩平凹陷与白云凹陷连通,恩平组上段第Ⅲ期三角洲物源区主要为北部隆起区,供源河流表现为远物源的曲流河特征;第Ⅱ期三角洲母岩表现为混合特征,是物源转换过渡期的产物。恩平组晚期物源区的北移以及供源面积的扩大造成了三角洲物源供给的增强,而这正是白云凹陷北坡恩平组进积三角洲持续发育的主要原因之一。砂岩的颗粒组分是控制深部储层质量的重要因素,白云凹陷恩平组上段因母岩变化导致砂岩中长石含量较高,具备了发育大量次生孔隙的物质条件,而三角洲分流河道及其前缘各类砂体是理想的有利储层发育相带,白云凹陷北部恩平组上段具备发育优质储层的潜力。

关键词: 物源分析, 白云凹陷, 恩平组, 沉积演化, 深部储层

Abstract:

Explorations have proved that coal-bearing series and related mudstone of Enping Formation (Early Oligocene) are the main hydrocarbon source rock in Baiyun Sag,Pearl River Mouth Basin.According to seismic profiles and well data,there is a large pro-graded delta in the north of Baiyun Sag in Early Oligocene,which can be divided into three stages.The Rare Earth Element study shows that most of the 1st stage delta’s source rocks are sedimentary rock,which comes from Panyu low-uplift by braided rivers;because of the effect of peneplanation,Enping Sag and Baiyun Sag are connected by meandering rivers,and source rocks of the last stage delta is mostly granite,which is distributed to the north of Enping Sag.The increasing area of provenance and catchment causes the increasing supplementation of the delta,while it is one of the crucial reasons that the pro-graded delta can develop and extend bigger and wider constantly.Composition of sandstone has a critical influence on the quality of the deep-burial reservoirs,and feldspathic-rich sandstone in Baiyun Sag gets great dissolution potential to develop much more secondary porosity.upper Enping Formation in north of Baiyun Sag could be great exploration target in which channels,bars and other kinds of sandstones of delta are all great potential reservoirs.

Key words: Provenance analysis, Baiyun Sag, Enping Formation, Sedimentary evolution, Deep-burial reservoirs

中图分类号: 

  • TE121.3
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