石油学报 ›› 2010, Vol. 31 ›› Issue (6): 906-912.DOI: 10.7623/syxb201006006

• 地质勘探 • 上一篇    下一篇

渤海海域沙三段烃源岩评价及排烃特征

姜福杰 1,2  庞雄奇 1,2  姜振学 1,2  武  丽 1,2  周小慧 1,2  李晓蕾 1,2   

  1. 1中国石油大学盆地与油藏研究中心  北京  102249; 2中国石油大学油气资源与探测国家重点实验室  北京  102249
  • 收稿日期:2010-02-05 修回日期:2010-05-15 出版日期:2010-11-25 发布日期:2011-01-20
  • 通讯作者: 姜福杰
  • 作者简介:姜福杰,男,1979年12月生,2008获中国石油大学(北京)博士学位,现为中国石油大学(北京)讲师,主要从事油气成藏机理和资源评价的研究和教学工作。
  • 基金资助:

    国家重点基础研究发展规划(973)项目(2006CB202300)和国家自然科学基金项目(No.40472078)联合资助。

The quality evaluation and hydrocarbon-expulsion characters of source rocks in the 3rd member of Shahejie Formation in the Bohai sea

JIANG Fujie 1,2  PANG Xiongqi 1,2  JIANG Zhenxue 1,2  WU Li 1,2  ZHOU Xiaohui 1,2  LI Xiaolei 1,2   

  • Received:2010-02-05 Revised:2010-05-15 Online:2010-11-25 Published:2011-01-20

摘要:

利用加权平均的方法,对单井烃源岩地化指标进行了计算。在此基础上,采用单井地质地化数据与地震反演、沉积相、构造埋深等资料“点—面”相互结合、验证的方法,对烃源岩厚度、有机质丰度、有机质类型进行了平面预测与评价。根据这些预测结果,应用生烃潜力法建立了3种类型有机质的排烃模式并对烃源岩排烃特征进行了系统评价。结果表明,沙三段烃源岩具有厚度大、有机质丰度高、有机质类型好的特征,但各凹陷差别较大;Ⅰ、Ⅱ、Ⅲ型有机质对应的排烃门限分别为2740m、2795m和2850m,总排烃量为174.66×108t,主要分布在渤中、辽中、黄河口、歧口等凹陷,馆陶组和明化镇组沉积期是主要的排烃期。综合而言,沙三段烃源岩排烃量大,且大部分凹陷属于晚期排烃,具有良好的资源前景。

关键词: 有机质丰度, 有机质类型, 加权平均, 排烃门限, 沙三段, 烃源岩, 渤海海域

Abstract:

Geochemical indicators of source rocks for a single well were calculated using the weighted average and on this basis the thickness of source rocks, the abundance and the type of organic matter were laterally forecasted and evaluated by means of validating multiple data with each other, for instance, integrating geological and geochemical data for a single well with data of related seismic inversion, sedimentary facies and structurally burial depth, etc. In accordance with this prediction and evaluation, different models of hydrocarbon expulsion for three types of organic matter were established using the hydrocarbon generative potential measurement. The results showed that source rocks in the Es3 member show characters of great thickness, high abundance and good types of organic matter, though they vary considerably in different sags. The threshold of hydrocarbon expulsion corresponding to typeⅠ,Ⅱ and Ⅲ of organic matter is 2740m, 2795m and 2850m, respectively, and the total amount of hydrocarbon expulsion is 174.66 × 108t, mainly distributed in the central Bohai sag, the central Liao River sag, the Yellow River estuary sag and the Qikou sag. Depositional stages of the Guantao and Minghuazhen formations are the two major periods of hydrocarbon expulsion. In general, source rocks in the Es3 member have expulsed large amounts of hydrocarbons, and most of the sags are of hydrocarbon expulsion at the late stage, indicating a promising resource prospect.

Key words: abundance of organic matter, type of organic matter, weighted average, threshold of hydrocarbon expulsion, the 3rd member of Shahejie Formation, source rock, Bohai sea