西澳大陆架深水重力流砂体富集规律及主控因素  

Sandbody Accumulation Pattern and Key Controlling Factors of Deep-water Deposits in Northwest Australian Shelf

作　　者：杨帆[1] 于兴河[2] 李胜利[2] 路琳琳[3] 陈苑[3] 

机构地区：[1]中国石油勘探开发研究院,北京海淀100083 [2]中国地质大学(北京)能源学院,北京海淀100083 [3]中国石油勘探开发研究院廊坊分院,河北廊坊065007

出　　处：《西南石油大学学报（自然科学版）》2016年第2期68-78,共11页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家科技重大专项(2011ZX05001-003)

摘　　要：澳大利亚西北大陆架是目前全球深水油气勘探的热点区域。针对西澳大陆架Vulcan次盆南部Vulcan组砂体成因类型、沉积体系展布、富砂区控因不明确等问题,通过岩芯观察、钻测井资料和地震属性的分析,刻画了以海相三角洲前缘滑塌体为主导的贫砂富泥型深水沉积体展布,重点研究了深水沉积砂体的分布规律和富集主控因素。认为研究区东南部的缓坡带发育海相三角洲,在Swan地堑边界断层下降盘发育滑塌体和浊积体,北西部的陡坡带发育水下扇沉积。深水砂体的富集在4个层次上受5种因素的控制,表现为"四级五元"的控制特征,即:构造决定了沉积体系类型,海平面的升降约束了砂体在层序中的分布层位,沉积底形控制了深水沉积体系的外观形态,断层调节带改变了沉积体系的分布格局,深水底流对砂体进行了二次分配。该认识对研究区寻找规模储层和油气勘探都有重要作用。The northwest Australian shelf is the hot spot of global deep water hydrocarbon exploration. The Vulcan subbasin Vulcan Formation in western shelf deep water of northwest Australia is taken as an example and such questions are consid- ered as sand body forming type, deposition distribution and unclear controlling factor of sand rich area. Through well core description, drilling and logging data analysis and seismic interpretation, slump deposits in front of marine delta model is built to mainly study. It is found that the gentle slope in the southeast part of research area generates marine delta, and slump and turbidite are developed under the boundary fault downthrown of Swan Graben. The steep slope in northwestern area developed into subaqueous fan because of the direct sediments injection into the sea. Then the main controlling factors of deep water deposits are studied. It is believed that ＂four stages and five elements＂ model controlled the sandbody distribution in the Vulcan Sub-basin. Namely, structure style determines types of sediments; sea level changes constrain the accumulation of sandbody among sequence layers; deposit bedform forms appearance shape of sediment system; accommodation zone changes distribu- tion pattern of the sediments, and deepwater bottom current re-transportates sandbody. The discovery is important for finding reservoir and exploring oil gas in research area.

关 键 词：澳大利亚西北大陆架 深水沉积 重力流 富集规律 控砂机制 

分 类 号：TE122[石油与天然气工程—油气勘探]