摘要
为明确环渤中凹陷西次洼东三段砂体差异富集的控制要素,根据测井、最新三维地震等资料,重建环渤中凹陷西次洼石臼坨凸起西段和沙垒田凸起东段两大物源区东三段沉积期古地貌,定量表征两大物源区母岩和规模、宏观古地貌、古沟谷等4个构成要素,探讨各要素耦合关系对砂体差异富集的控制作用。结果表明:沙垒田凸起东段北部物源区母岩类型优越,主要分布前寒武系变质花岗岩类,规模较大,但是宏观古地貌处于高势区,不是优势输砂方向,古沟谷也欠发育,沉积区砂体富集程度相对低;石臼坨凸起西段南部物源区的母岩类型中等,规模大,且为宏观地貌低势区,是优势输砂方向,古沟谷发育,数量多,时空连续性较好,规模较大,宽深比整体适中,沉积区砂体富集。良好的母岩类型和一定规模的物源、在物源区宏观古地貌低势方向、古沟谷发育位置对应的砂体卸载区是富砂储层发育的有利区。
In order to define the way provenance elements control the differential sedimentation of sand body,and accurate prediction of reservoir,using drilling well-logging and latest 3 D seismic data,reconstructing the paleogeomorphy when 3 rd member of Dongying formation was developed in both west section of Shijiutuo salient and Shaleitian salient eastern section in west sag around the Bozhong depression. Quantitative characterization of provenance size,parent rocks,macroscopic paleogeomorphy and paleo-ravine. The results show that the parent rocks in north part of east section of Shaleitian salient is vast,its type is primarily metamorphic granite from Precambrian period,and larger scale,however because the macroscopic paleogeomorphy was elevated which is not an ideal direction for sediment moving,also considering the lack of paleo-ravine,the sedimentation of sand in this sedimentary area is relatively low. The parent rocks in south of Shijiutuo salient west section is less developed but also vast,and large scale,notably the paleo-terrain is lying low which is ideal for sand body edimenta-tion,further considering the development of ancient valley in large number,well connected in the dimension of time and space,huge scale,good width/depth ratios,this sedimentary area has greater sand body development.Favorable parent rocks,huge scale of provenance combined with low-lying macroscopic paleogeomorphy,and sedimentation in well-developed paleo-ravine makes good target for sandstone reservoir.
出处
《东北石油大学学报》
CAS
北大核心
2017年第6期9-14,35,共7页
Journal of Northeast Petroleum University
基金
国家科技重大专项(2011ZX05023-002)
关键词
渤中凹陷
物源要素
母岩类型
古地貌
古沟谷
物源区规模
砂体差异富集
Bozhong depression
provenance elements
parent rocks
macroscopic paleogeomorphy
paleo-ravine
provenance size
differential sedimentation of sand body
作者简介
周晓光（1984—)，男，硕士，工程师，主要从事石油地质勘探方面的研究。
