Geochemical characteristics and hydrocarbon generation potential of Eocene oil shale in Songxi Sag, Qiongdongnan Basin
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摘要:
研究目的 近期在松西凹陷钻遇了一套厚层的始新统油页岩，是琼东南盆地首次钻遇油页岩。为进一步查明该源岩的生烃潜力，进而推动下步勘探。
研究方法 通过钻井记录、元素检测及系列地球化学测试，研究油页岩的特征及形成环境，并对这套油页岩资源潜力进行了预测。
研究结果 分析显示，这套油页岩总有机碳含量（TOC）平均为3.33%，热解生烃潜量（S1+S2）平均为22.2 mg/g，氢指数（HI）平均606 mg/gTOC。沉积环境为温暖半湿润的还原淡水湖泊环境，具有低等水生生物和高等陆生植物混源输入的特征。
结论 研究表明，该套油页岩有机质丰度高、类型好、古生产力高，为好—优质烃源岩，其原油资源量约为4140×104 t，原油资源潜力巨大，常规油气和页岩油均有较大的勘探潜力。
Abstract:Objective Recently, a set of thick Eocene oil shale was drilled in Songxi Sag, which is the first time the oil shale was drilled in Qiongdongnan Basin. In order to implement the hydrocarbon generation potential of the Eocene oil shale and promote further exploration in songxi sag, Qiongdongnan Basin.
Methods this article is based on drilling records, elemental assays and a series of geochemical tests to study the characteristics and formation environment of oil shale and predict the resource potential of this oil shale.
Results The analysis results show that the average Total Organic Carbon (TOC) of this set of oil shale was 3.33%, the average pyrolysis hydrocarbon potential (S1+S2) was 22.2 mg/g, and the average Hydrogen Index (HI) was 606 mg/g TOC. The sedimentary environment of this oil shale is a warm semi−humid reduced freshwater lake environment, which has the characteristics of mixed input of lower aquatic organisms and higher terrestrial plants.
Conclusions It shows that the oil shale has high organic matter abundance, good type and high paleoproductivity, which is a good to high−quality source rock. Its crude oil resources are about 41.4 million tons, with huge potential for crude oil resources.Both conventional oil and gas and shale oil have great exploration potential.
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Key words:
- oil shale /
- hydrocarbon generation potential /
- biomarker /
- Songxi Sag /
- Qiongdongnan Basin
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表 1 陆相烃源岩有机质成烃演化阶段划分及判别指标（据SY/T 5735—1995）
Table 1. Hydrocarbon generation and evolution stages of organic matter in continental source rocks
演化阶段 未成熟 低成熟 成熟 高成熟 过成熟 Ro/% <0.5 0.5~0.7 0.7~1.3 1.3~2 >2 Tmax/℃ <435 435~440 440~450 450~580 >580 ɑɑɑ-C2920S/（20S+20R） <0.2 0.2~0.4 >0.4 — — C29ββ/（ββ+ɑɑ） <0.2 0.2~0.4 >0.4 — — 
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表 2 松西凹陷始新统油页岩生物标志化合物参数
Table 2. Biomarker parameters of Eocene oil shale in Songxi Sag
生标参数 深度/m 3536 3568 3586 3598 （nC21+nC22）/（nC28+nC29） 0.81 0.88 0.85 0.77 CPI 1.24 1.26 1.19 1.19 OEP 1.27 1.44 1.31 1.25 Pr/Ph 2.2 2.32 2.22 2.65 Pr/nC17 1.99 1.3 1.22 2.01 Ph/nC18 0.68 0.44 0.36 0.6 C19TT/C23TT 0.19 0.36 0.4 0.25 C24TeT/C26TT 0.77 1.4 1.22 0.91 OL/C30H 0.1 0.17 0.16 0.16 Ga/C30H 0.06 0.07 0.06 0.06 Ts/Tm 1.71 1.74 1.96 2.35 C27/C29ɑɑɑR 0.86 0.83 0.8 1.06 C2920S/（20S+20R） 0.36 0.4 0.39 0.42 C29ββ/（ββ+ɑɑ） 0.47 0.51 0.56 0.54 4-甲基甾烷/C29甾烷 0.92 0.6 0.69 1
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