板桥凹陷沙三段沉积体系与物源分析  

DEPOSITIONAL SYSTEMS AND SOURCE PROVENANCE OF THE THIRD MEMBER OF SHAHEJIE FORMATION IN BANQIAO SAG

作　　者：陈纯芳[1] 郑浚茂[2] 王德发[2] 

机构地区：[1]石油大学(北京)地球科学系 [2]中国地质大学

出　　处：《古地理学报》2001年第1期55-62,共8页Journal of Palaeogeography：Chinese Edition

基　　金：中国石油天然气集团公司油气储层重点实验室资助项目

摘　　要：板桥凹陷位于黄骅坳陷中北部 ,老第三系沙河街组沙三段是主要生储油岩系。根据沉积环境、沉积特征及重矿物组合分布 ,板桥凹陷沙三段沉积期在湖盆的陡岸发育扇三角洲—深水浊积扇—深湖沉积体系以及近岸水下扇—深湖沉积体系 ,不同的物源区通过边界断层的运动控制着沉积体系的发育。在盆地的裂陷兴盛期 ,北部燕山褶皱带物源经过北塘凹陷和海河断层 ,于长芦一带形成扇三角洲 ,并进一步向板桥凹陷中央推进 ,形成板桥深水浊积扇沉积体 ;西北部的沧县隆起物源则沿着不同的入口 ,在沧东大断裂下降盘形成近岸水下扇和扇三角洲 ,它们也可进一步向凹陷深处推进而形成深水浊积体。应用沉积体系分布与油气聚集的规律 ,处于沉积体系的中间相带的扇三角洲和深水浊积扇 ,具有良好的油气生储盖组合 ,是断陷湖盆中有利的勘探目标。The Banqiao sag lies in the middle northern part of the Huanghua Depression, and the third member of Shahejie Formation is the main oil generating strata and reservoirs in the area. Based on studies of sedimentary characteristics, petrological characteristics, heavy minerals and distribution of sandbodies in the Banqiao sag, the fan delta-deep water turbidity fan-deep lake depositional system and near shore subaqueous fan-deep lake depositional system are recognised. Different source provenance areas controlled the development of depositional systems by the movement of main border faults.During the rifting subsiding stage of the basin, the north Yanshan Fold Belt source provenance bypassed the Beitang sag and Haihe fault,formed fan delta in the Changlu area,and pushed into the Banqiao sag to form deep water turbdity fan.From different inlets of the Cangxian uplift in northwest,the sediments were poured into the sag to form near shore subaqueous fan or fan delta along down dropped block of the Cangdong fault,and they were also be pushed into the sag to form deep water turbidity. According to the theory of depositional system distributions and oil and gas accumulation,the middle facies belt of depositional system,such as deep water subaqueous fan and fan delta,have good oil generating strata and reservoirs,and they are the most prospective areas for exploration.

关 键 词：板桥凹陷 沙三段 沉积体系 物源分析 生储盖组合 沉积环境 沉积特征 

分 类 号：P512.2[天文地球—地质学]