石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (4): 810-821.doi: 10.11743/ogg20190411

• 油气地质 • 上一篇    下一篇

辽西雷家地区沙四段中-低熟烃源岩排烃效率与致密油-页岩油勘探前景

王媛, 汪少勇, 李建忠, 张义杰   

  1. 中国石油 勘探开发研究院, 北京 100083
  • 收稿日期:2018-10-19 修回日期:2019-01-22 出版日期:2019-08-28 发布日期:2019-06-01
  • 作者简介:王媛(1990-),女,博士后,沉积与油气地质勘探。E-mail:wangyuan419@petrochina.com.cn。
  • 基金资助:
    国家油气重大专项(2017ZX05001)。

The hydrocarbon expulsion efficiency of medium-low mature source rocks and tight-shale oil potential in the Es4, Leijia area in West Depression, Liaohe Basin

Wang Yuan, Wang Shaoyong, Li Jianzhong, Zhang Yijie   

  1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2018-10-19 Revised:2019-01-22 Online:2019-08-28 Published:2019-06-01

摘要: 辽河西部凹陷雷家地区沙河街组四段在咸化闭塞湖湾环境下,发育高丰度厚层云质、方沸石质泥岩和页岩,整体处于低成熟阶段(Ro=0.3%~0.7%)。铸体薄片、扫描电镜分析表明,页岩储层广泛发育构造缝和收缩缝,碎屑矿物粒间孔发育,纳米孔主要为白云石、方沸石矿物溶蚀孔,有机质纳米孔不发育。采用TOC测井定量评价方法(ΔlgR法)明确了沙四段优质烃源岩(TOC>4%)的纵横向展布特征。其中,杜家台油层优质烃源岩和高升油层优质烃源岩均集中分布在雷家-陈家洼陷地区。排烃效率实验分析结果表明,在当前热演化程度下,烃源岩排烃效率在12%~17%,总生烃量在10~35 mg/g。由于高丰度烃源岩累积厚度大,估算雷家地区沙四段致密油-页岩油总资源量达1.37×108 t。通过源-储组合综合分析,认为雷家地区沙四段杜家台油层为致密油-页岩油有利勘探区,高升油层为页岩油有利勘探区,由于各类岩性均具有一定的生烃潜力和储集能力,适合致密油-页岩油整体开发。

关键词: 源-储组合, 中-低熟烃源岩, 排烃效率, 致密油-页岩油, 沙四段, 雷家地区, 辽西凹陷

Abstract: Thick dolomitic/analcite mudstones and shales at the stage of lower maturity(Ro:0.3% -0.8%) are deve-loped in saline and restricted bay environment of the 4th member of Shahejie Formation(Es4), Leijia area in West Depression, Liaohe Basin.Based on the analysis of casting thin sections and SEM images, it is found that structural fractures and constricted fissures are highly developed in shale reservoirs, intergranular pores in clastic minerals are also developed, and dissolved nanopores in dolomites and analcites are present without organic nanopores.What's more, the distribution of hydrocarbon source rocks with high abundance of organic matters(TOC>4%) is determined with the quantitative evaluation of well logging using TOC data(ΔlgR method).It reveals that quality hydrocarbon source rocks in Dujiatai and Gaosheng reservoirs are distributed mainly in Leijia and Chenjia sags.In addition, the experimental results of hydrocarbon expulsion efficiency show that at the current maturity stage, the expulsion efficiency of hydrocarbon source rocks ranges from 12% and 17%, with the hydrocarbon production totaling 10 to 35 mg/g.As for the high abundance and large cumulative thickness of hydrocarbon source rocks, it is estimated that the tight-shale oil reserves can reach 1.37×108 t in Es4, Leijia area.According to the integrated analysis of source-reservoir assemblages, the Dujiatai reservoir in Es4, Leijia area is favorable for tight-shale oil exploration, while the Gaosheng reservoir is favorable for shale oil exploration.In a word, the studied area is favorable for integrated exploration of tight-shale oil since different types of hydrocarbon source rocks have certain hydrocarbon-generating and reserving potentials.

Key words: source-reservoir assemblage, medium-low mature source rock, hydrocarbon expulsion efficiency, tight-shale oil, Es4, Leijia area, West Depression of Liaohe Basin

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