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胜利油田孤东矿区老第三系沙河街组辫状河三角洲沉积
引用本文:李维锋,高振中,彭德堂.胜利油田孤东矿区老第三系沙河街组辫状河三角洲沉积[J].成都理工大学学报(自然科学版),2002,29(5):511-514.
作者姓名:李维锋  高振中  彭德堂
作者单位:1. 南京大学地球科学系,南京,210093;江汉石油学院地球科学系
2. 江汉石油学院地球科学系
摘    要:胜利油田孤东矿区老第三系沙河街组中发现丰富的湖泊辫状河三角洲沉积物 ,其特征显著 ,明显有别于其他类型的三角洲 ,可见到 8种特征各异的微相。辫状河三角洲的主体为辫状河道砂坝及水下分流河道砂坝 ,单一河道砂坝呈透镜状 ,由含砾砂岩及中、粗粒砂岩组成向上变细层序 ,常见多个河道砂坝在纵向上互相叠置。三角洲中交错层理丰富 ,其中尤以水道砂坝侧向迁移加积而形成的侧积交错层发育为标志。在上述基础上 ,归纳总结了辫状河三角洲的鉴别标志 ,这对于在其他地区鉴别辫状河三角洲沉积具有意义。

关 键 词:辫状河三角洲  沙河街组  胜利油田
文章编号:1005-9539(2002)05-0511-04
修稿时间:2002年1月28日

A CASE STUDY OF THE BRAIDED-RIVER DELTA IN THE PALAEOGENE SHAHEJIE FORMATION IN THE GUDONG AREA, SHENGLI OIL FIELD
LI Wei-feng ,GAO Zhen-zhong ,PENG De-tang.A CASE STUDY OF THE BRAIDED-RIVER DELTA IN THE PALAEOGENE SHAHEJIE FORMATION IN THE GUDONG AREA, SHENGLI OIL FIELD[J].Journal of Chengdu University of Technology: Sci & Technol Ed,2002,29(5):511-514.
Authors:LI Wei-feng    GAO Zhen-zhong  PENG De-tang
Institution:LI Wei-feng 1,2,GAO Zhen-zhong 2,PENG De-tang 2
Abstract:Braided-river deltas that braided river systems prograde into an inland lake are first found in the Palaeogene Shahejie Formation in the Gudong area, Shengli Oil Field. Their characters are distinct and significantly different from the other types of deltas. Three sedimentary subfacies, that is, braided-river delta plain subfacies, braided-river delta front subfacies and prodelta subfacies, and eight microfacies are recognised. The sediments of braided-river deltas are mainly composed of pebbled sandstone and medium-to coarse-grained sandstones. The bars of the distributary channels and subaqueous distributary channels are the main bodies of deltas. A single channel bar has a thickness of 0.15~2.2 m. Many finger-upward lenticular channel sand bodies pile vertically up each other. Cross-stratification is abundant in the braided-river deltas, but the lateral accretion cross-bedding resulting from lateral accretion of channel sand bodies is the most principal sedimentary structure and one of the most distinct characters of braided-river deltas.
Keywords:braided-river delta  Shahejie Formation  Shengli Oil Field
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