南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (6): 924–933.doi: 10.13232/j.cnki.jnju.2019.06.005

• 应用矿物学 • 上一篇    下一篇

渤南洼陷沙三下亚段烃源岩地球化学特征及差异性研究

王大洋()   

  1. 中国石化胜利油田分公司勘探开发研究院,东营,257015
  • 收稿日期:2019-10-08 出版日期:2019-11-30 发布日期:2019-11-29
  • 通讯作者: 王大洋 E-mail:wangdayang.slyt@sinopec.com
  • 基金资助:
    国家自然科学基金(41372129);国家“973”计划(2014CB239105);国家科技重大专设项目(2017ZX05049?004)

Geochemical characteristics and difference of source rocks in the lower segment of Es3 member in Bonan Subsag

Dayang Wang()   

  1. Geological Scientific Research Institute,Shengli Oilfield Company,Sinopec, Dongying,257015,China
  • Received:2019-10-08 Online:2019-11-30 Published:2019-11-29
  • Contact: Dayang Wang E-mail:wangdayang.slyt@sinopec.com

摘要:

沙三段烃源岩是渤南洼陷的主力烃源岩.为了研究该套烃源岩不同发育区的地球化学特征,建立区域沉积环境和地球化学特征之间的关系,筛选伽马蜡烷指数、C35/C34藿烷、C29/C30藿烷、Ts/Tm等地化指标进行对比,分析了渤南洼陷沙三下烃源岩沉积环境的横向与纵向差异性以及各类沉积环境与地化参数的关联性.研究认为,纵向上由早期还原性半咸水深湖相到晚期微咸水半深湖相的变化沉积序列,具有伽马蜡烷指数、C35/C34藿烷、C29/C30藿烷降低,Ts/Tm增大的特征;横向上以沙三段13砂组为例,结合不同区的沉积环境,划分了微咸水陆源相、半咸水混源相、半咸水深湖相、微咸水混源相四种沉积有机相,各沉积有机相的地化指标的高低与岩相、水体环境等具有明显的相关性.通过研究建立了较为明晰的沉积环境?地化特征对应关系,为开展精细油源对比提供依据.

关键词: 渤南洼陷, 沙三下, 沉积环境, 地化参数, 微咸水混源相

Abstract:

The source rocks of Es3 member are the main source rocks in Bonan Subsag. In order to study the geochemical characteristics of the source rocks in different development areas and establish the relationship between regional sedimentary environment and geochemical characteristics,this paper compares the geochemical indexes such as gamma paraffin index,C35/C34Chopane,C29/C30Chopane,Ts/Tm and analyses the horizontal and vertical sedimentary environments of the source rocks,directional difference and correlation between various sedimentary environments and geochemical parameters of Es3 member in Bonan Subsag. The results show that according to the sedimentary sequence from the early reductive brackish deep lake to the late brackish semi?deep lake vertically,gamma paraffin index,C35/C34Chopane and C29/C30Chopane decrease,Ts/Tm increases. In the horizontal direction,taking the sand group of Es3 member as an example,combined with the sedimentary environment of different areas,the brackish water land source phase,the semi?brackish water mixed source phase,the semi?brackish deep lake phase,and the brackish water mixed source phase are divided. There are four kinds of sedimentary organic phases in the source phase,and the geochemical index of each sedimentary organic phase has obvious correlation with the lithofacies and water environment. Through this study,a clear relationship between sedimentary environment and geochemical characteristics has been established,which provides a basis for fine oil source correlation.

Key words: Bonan Subsag, the lower segment of Es3 member, sedimentary environment, geochemical indexes, the brackish water mixed source phase

中图分类号: 

  • TE122.1+13

图1

渤南地区沙三下岩相古地理示意图"

图2

罗69井沙三下不同岩性岩心照片(据陈琪[10])"

图3

渤南洼陷罗69井沙三下地化指标综合柱状图"

图4

罗69井沙三下微咸水与半咸水环境生物标志物指标相关图"

图5

渤南洼陷沙三下12砂组与13砂组生物标志物差异对比图"

图6

渤南洼陷沙三下13砂组地化指标平面分布图"

表1

渤南洼陷沉积有机相与地球化学参数对应关系"

沉积有机相 地 化 指 标
伽马蜡烷/C30藿烷 C35/C34藿烷 C29/C30藿烷 Ts/Tm
微咸水陆源相 <0.1 <0.6 <0.6 >0.5
半咸水混源相 0.1~0.2 >1.0 <0.6 0.5~1.0
半咸水深湖相 >0.2 >1.0 >1.0 <0.5
微咸水混源相 / <0.6 <0.6 /
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