Acta Petrolei Sinica ›› 2019, Vol. 40 ›› Issue (1): 35-41.DOI: 10.7623/syxb201901002

• Petroleum Exploration • Previous Articles     Next Articles

Biomarker parameters for effectively distinguishing source rocks in Bozhong sag

Lan Lei, Li Youchuan, Wang Ke, Jiang Xue, Sun Tao, Wang Jianxin   

  1. CNOOC Research Institute Company Limited, Beijing 100028, China
  • Received:2018-04-19 Revised:2018-09-18 Online:2019-01-25 Published:2019-01-29

一组有效区分渤中凹陷烃源岩的生物标志化合物参数

兰蕾, 李友川, 王柯, 姜雪, 孙涛, 王建新   

  1. 中海油研究总院有限责任公司 北京 100028
  • 通讯作者: 兰蕾,女,1987年6月生,2009年获长江大学资源勘查工程专业学士学位,2012年获中国石油大学(北京)地球化学专业硕士学位,现为中海油研究总院有限责任公司工程师,主要从事地球化学研究工作。Email:lanlei@cnooc.com.cn
  • 作者简介:兰蕾,女,1987年6月生,2009年获长江大学资源勘查工程专业学士学位,2012年获中国石油大学(北京)地球化学专业硕士学位,现为中海油研究总院有限责任公司工程师,主要从事地球化学研究工作。Email:lanlei@cnooc.com.cn
  • 基金资助:

    国家科技重大专项(2016ZX05024-002)资助。

Abstract:

In Bozhong sag as the largest sub-tectonic unit in Bohai Bay Basin, three sets of high-quality lacustrine source rocks are developed, i.e., Member 1 and 3 of Paleogene Shahejie Formation (E3s1 and E2s3) and Member 3 of Dongying Formation (E3d3).Accurate identification of the crude oil from E3d3 source rocks is of great theoretical and practical significance for petroleum exploration in Bozhong sag.According to the aromatic GC-MS analysis of crude oil and source rocks, this study proposes new biomarker parameters for distinguishing E3d3 and E2s3 source rocks, i.e., C2720R/C2820R tri-aromatic steroid (TAS)and C2820S/C2720R TAS.Source rocks with C2720R/C2820R TAS>1.1 and C2820S/C2720R TAS ≤ 1.2 are classified as E3d3, and those with C2720R/C2820R TAS ≤ 1.1 and C2820S/C2720R TAS>1.2 are considered to be E2s3.Accordingly, this study also analyzes the sources of crude oil in typical oil fields of Bozhong sag, and puts forwards that the crude oil from E3d3 source rocks presents the characteristics of accumulated in or near the sag.

Key words: tri-aromatic steroid, biomarker parameter, oil-source rock correlation, Member 3 of Dongying Formation, Bozhong sag

摘要:

渤中凹陷是渤海湾盆地面积最大的二级构造单元,发育古近系沙河街组一段、沙河街组三段和东营组三段3套优质湖相烃源岩。准确识别东营组三段烃源岩贡献的原油,对于渤中凹陷油气勘探具有重要的理论和实践意义。根据烃源岩和原油芳烃馏分的色谱-质谱分析结果,提出了新的能够鉴别沙河街组三段和东营组三段烃源岩的生物标志化合物参数:C2720R/C2820R三芳甾烷和C2820S/C2720R三芳甾烷。东营组三段烃源岩的判识标准为C2720R/C2820R三芳甾烷>1.1,C2820S/C2720R三芳甾烷≤ 1.2;沙河街组三段烃源岩的判识标准为C2720R/C2820R三芳甾烷≤ 1.1,C2820S/C2720R三芳甾烷>1.2。据此,对渤中凹陷典型油田中原油的来源开展了判识,提出来自东营组三段烃源岩的原油具有近凹成藏的特点。

关键词: 三芳甾烷, 生物标志化合物参数, 油源对比, 东营组三段, 渤中凹陷

CLC Number: