惠民凹陷南坡沙四上亚段滩坝砂体沉积特征及形成条件

doi:10.11743/ogg20140316

石油与天然气地质 ›› 2014, Vol. 35 ›› Issue (3): 410-416.doi: 10.11743/ogg20140316

惠民凹陷南坡沙四上亚段滩坝砂体沉积特征及形成条件

袁静¹, 梁绘媛¹, 谭明友², 陈晓杰³, 董道涛¹, 孙明江², 高若函¹

1. 中国石油大学地球科学与技术学院, 山东青岛 266580;
2. 中国石化胜利油田物探研究院, 山东东营 257000;
3. 中国石化胜利油田纯梁采油厂, 山东东营257000

收稿日期:2013-12-05 修回日期:2014-02-25 出版日期:2014-06-08 发布日期:2014-07-11
第一作者简介:袁静（1972- ），女，教授，储层沉积学和储层地质学。E-mail：drjyuan@163.com。

Sedimentary characteristics and forming conditions of beach-bar sandbodies in the upper fourth member of the Shahejie Formation in the south slope of the Huimin Sag

Yuan Jing¹, Liang Huiyuan¹, Tan Mingyou², Chen Xiaojie³, Dong Daotao¹, Sun Mingjiang², Gao Ruohan¹

1. School of Geosciences, China University of Petroleum, Qingdao, Shandong 266580, China;
2. Geophysical Prospecting Research Institute, SINOPEC Shengli Oilfield Company, Dongying, Shandong 257000, China;
3. Chunliang Oil Producer, SINOPEC Shengli Oilfield Company, Dongying, Shandong 257000, China

Received:2013-12-05 Revised:2014-02-25 Online:2014-06-08 Published:2014-07-11

摘要/Abstract

摘要：

在精细岩心描述的基础上，通过综合分析岩石粒度特征、录井、测井、地震以及大量区域地质背景资料，对惠民凹陷南坡沙四上亚段滩坝砂体的沉积特征、展布规律和形成条件进行了系统研究。结果表明：研究区滩坝砂以粉-细砂岩和粉砂岩为主，泥质含量较高，物性较差。垂向上，4砂组—2砂组沉积时期滩坝砂体零星发育，1砂组发育大面积漫湖滩坝；平面上，滩坝砂体沿夏口断层呈带状分布。从湖平面条件来看，枯水面之下的稳定水深和较强波浪作用更利于坝砂发育；从构造条件来看，夏口断层形成的地形坡折一方面促进了滩坝砂体沿断层下降盘聚集，另一方面也限制了滩坝的横向展布宽度；从物源供给来看，洪水漫湖条件下基岩和先成沉积物的线状供源比末端扇在洪泛期砂体入湖更利于滩坝大面积发育。

关键词: 滩坝, 砂体沉积特征, 沙四上亚段, 惠民凹陷南斜坡

Abstract:

Sedimentary characteristics,distribution patterns and forming conditions of beach-bar sandbodies in the upper fourth member of the Eocene Shahejie Formation on the south slope of the Huimin sag have been systematically analyzed in this paper based on detailed core description and analyses of grain sizes,well log,seismic and the regional geological background data.The result indicates that the beach-bar sandstones are dominated by siltstones and fine-grained silty sandstones of high mud content,thus have unfavorable physical properties.Vertically,the beach-bar sandbodies are common in the first sand group but sporadic in the second,the third and the fourth sand groups.Laterally,beach-bars in the studying area distribute along the Xiakou fault.Stable water depth and stronger waves were beneficial to the formation of beach-bar sandbodies.The slope break caused by the Xiakou fault was helpful for beach-bar sandbodies to be formed along the thrown side of the fault but also restricted the horizontal spreading of the beach-bar.Sediments from the basement and earlier deposited layers in flood-overflow lake provided better sediment source for the beach-bar to develop than that from the terminal fan during floo-ding period.

Key words: beach-bar,sedimentary characteristics of sandbodies, upper Es⁴ Formation, south slope of the Huimin Sag

中图分类号:

TE121.3

袁静,梁绘媛,谭明友,等. 惠民凹陷南坡沙四上亚段滩坝砂体沉积特征及形成条件[J]. 石油与天然气地质, 2014, 35(3): 410-416. doi: 10.11743/ogg20140316 Yuan Jing,Liang Huiyuan,Tan Mingyou,et al. Sedimentary characteristics and forming conditions of beach-bar sandbodies in the upper fourth member of the Shahejie Formation in the south slope of the Huimin Sag[J]. Oil & Gas Geology, 2014, 35(3): 410-416. doi: 10.11743/ogg20140316

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惠民凹陷南坡沙四上亚段滩坝砂体沉积特征及形成条件

Sedimentary characteristics and forming conditions of beach-bar sandbodies in the upper fourth member of the Shahejie Formation in the south slope of the Huimin Sag

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