A NEW TYPE OF OIL SANDS IN THE BEIPIAO FORMATION OF JINYANG BASIN, WESTERN LIAONING PROVINCE: Geochemical Characteristics and Geological Implication
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摘要:
金羊盆地章吉营子凹陷西缘的SZK04井北票组发现了油气显示，有机地球化学分析结果显示该类油砂具有姥植比低、藿烷系列化合物丰富、伽马蜡烷含量较高、甾烷系列化合物缺失且碳同位素较轻的特征.综合生物标志化合物及组分碳同位素认为，SZK04井油砂应为海相还原环境沉积的烃源岩贡献，且有机质的来源应以细菌输入为主.结合本区地质背景，认为该类海相油砂可能来自中新元古界烃源岩，这为金羊盆地乃至辽西地区的中新元古界油气勘探提供了依据.
Abstract:The occurrence of oil and gas is discovered in the Beipiao Formation of SZK04 well located on the western margin of Zhangjiyingzi Sag in Jinyang Basin. The organic geochemical analysis results show that such oil sands are characterized by low pristane-phytane ratio, abundant hopane compounds, high gammacerane content, deficiency of sterane compounds and light carbon isotopes. Combined with the biomarker compounds and carbon isotope values, it is believed that the source rocks deposited in marine reduction environment should contribute to the oil sands of SZK04 well, with the organic matter mainly from bacterial input. Considering the geological background of the area, it is concluded that the type of marine oil sands may come from the MesovNeoproterozoic source rocks, which provides a basis for the Meso-Neoproterozoic oilvgas exploration in Jinyang Basin and even the western Liaoning Province.
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Key words:
- Jinyang Baisn /
- Beipiao Formation /
- SZK04 well /
- oil sand /
- biomarker compound /
- Liaoning Province
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表 1 金羊盆地北票组油砂饱和烃气相色谱数据
Table 1. Saturated hydrocarbon gas chromatographic parameters of the oil sands from Beipiao Formation
样品编号 CPI OEP ∑nC21-/∑nC22+ （nC21+nC22）/（nC28+nC29） Pr/nC17 Ph/nC18 Pr/Ph 主峰碳数 *SZK02-75 1.14 1.06 0.75 2.22 0.17 0.05 3.54 C23 *SZK02-138 1.10 1.20 0.90 1.86 0.15 0.07 2.71 C23 *SZK02-159 1.10 1.04 0.65 1.89 0.16 0.04 3.28 C23 *SZK02-202 1.07 1.07 1.01 2.72 0.15 0.06 2.50 C23 *冠山煤矿 1.17 - 1.1 3.2 - - 2.6 C21 *羊D1-1 1.16 1.03 0.47 2.68 0.36 0.19 0.73 C21 *羊D1-2 1.28 1.02 0.84 5.99 0.49 0.15 0.45 C21 SZK04-222.2 1.21 0.99 2.37 4.48 0.39 0.72 0.60 C15 SZK04-228.2 1.36 0.92 1.17 3.10 0.61 1.30 0.35 C18 *据文献[7-11]，-为未检测到. 
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