石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (6): 1366-1377.doi: 10.11743/ogg20230603

• 油气地质 • 上一篇    下一篇

渤海海域页岩油资源潜力

米立军(), 徐建永, 李威   

  1. 中海油研究总院有限责任公司，北京 100028
  • 收稿日期:2023-03-06 修回日期:2023-10-13 出版日期:2023-12-01 发布日期:2023-12-20
  • 第一作者简介:米立军（1965—），男，教授级高级工程师，海洋油气勘探理论研究和工程实践。E-mail：milj@cnooc.com.cn。
  • 基金项目:
    中国海洋石油集团有限公司“十四五”重大科技项目(KJGG2021-0100)

Shale oil resource potential in the Bohai Sea area

Lijun MI(), Jianyong XU, Wei LI   

  1. CNOOC Research Institute Co. ，Ltd. ，Beijing 100028，China
  • Received:2023-03-06 Revised:2023-10-13 Online:2023-12-01 Published:2023-12-20

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摘要：

渤海海域古近系沙河街组和东营组页岩油资源丰富，但勘探程度低，对页岩油资源的潜力评价和资源禀赋差异缺少系统研究，制约了勘探部署和有利区优选。基于渤海海域勘探开发实际情况，综合烃源岩地球化学实验及全岩矿物分析等，明确了渤海海域页岩油的资源潜力并指明了有利勘探方向。研究结果表明：①渤海海域5个富烃凹陷普遍发育优质烃源岩，成熟度适中，有利于形成页岩油。页岩油划分为分散资源、低效资源和富集资源等3类资源，各凹陷富集资源评价显示具有共同特征，总有机碳含量（TOC）>1.8 %，热解游离烃量（S1）>2.0 mg/g。②渤海海域5个富烃凹陷页岩油富集段均有分布，其中黄河口凹陷和渤中凹陷发育2个不同深度范围的页岩油富集段，且黄河口凹陷页岩油富集段埋深较浅，分布在2 800 m左右，辽中凹陷、歧口凹陷和秦南凹陷页岩油富集段埋深分布在2 800～3 200 m。③渤海海域沙（沙河街组）三段、沙一段和东（东营组）三段页岩油有利区面积均超10 000 km2， 5个富烃凹陷页岩油资源潜力总计超150×108 t，中-高成熟页岩油资源潜力总计超66×108 t，其中黄河口凹陷和辽中凹陷有机质丰度高、类型好，富集页岩油深度浅、资源潜力大，是现阶段最有利的勘探区域。

关键词: 资源潜力, 分级评价, 含油性, 页岩油, 沙河街组, 东营组, 渤海海域

Abstract:

The Paleogene Shahejie and Dongying formations in the Bohai Sea area are rich in shale oil resources. However， limited explorations， as well as a lack of systematic investigation of the potential evaluation and endowment differences of shale oil resources， have constrained the exploration deployment and favorable play fairway selection in the area. Based on the actual exploration and exploitation conditions in the area， we ascertain the resource potential and favorable exploration targets of shale oil through the geochemical experiments， and whole-rock mineralogical analysis of source rocks. The results are as follows： （1） High-quality source rocks are widespread in the five hydrocarbon-rich sags in the Bohai Sea area. These source rocks exhibit moderate maturity， conducive to generating shale oil. The shale oil in the area can be classified into three types： scattered （ineffective） resources， low-efficiency resources， and enriched resources. The evaluation results show consistent enriched resources across various sags， predominantly with total organic carbon （TOC） content >1.8 % and pyrolysis hydrocarbon content （S1） > 2.0 mg/g； （2） Shale oil-rich intervals are distributed across the five hydrocarbon-rich sags. Two shale oil-rich intervals with varying burial depths are found in the Huanghekou and Bozhong sags， with the interval in the Huanghekou Sag exhibiting smaller burial depth of around 2 800 m. In contrast， shale oil-rich intervals in the Liaozhong， Qikou， and Qinnan sags have burial depths ranging from 2 800～3 200 m； （3） For the 3rd and 1st members of the Shahejie Formation and the 3rd member of the Dongying Formation in the Bohai Sea area， each of these members have shale oil play fairways covering an area exceeding 10 000 km2. The five hydrocarbon-rich sags all boast shale oil resource potential beyond 15 × 109 t， to which moderately to highly mature shale oil contributes more than 6.6 × 109 t. Among these sags， the Huanghekou and Liaozhong sags， enjoying organic matter of high abundance and favorable types， shallow shale oil enrichment， and considerable resource potential， serve as the most favorable targets for current exploration.

Key words: resource potential, grading evaluation, oil-bearing capacity, shale oil, Shahejie Formation, Dongying Formation, Bohai Sea area

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