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在湖北宜昌下奥陶统红花园组生物礁中发现并采集到轻质油苗。油苗赋存于碳酸盐岩的成岩裂隙、晶间孔和铸模孔中，其ＲＩＣ谱图清楚反映了烃源岩的海相特征和原油的高成熟性．这一发现对该区油气评价具有积极意义。
The light oil seedlings were found and collected in the reefs of the Lower Ordovician Honghuayuan Formation in Yichang, Hubei Province. Oil sands occur in diagenetic, intercrystalline and mold holes in carbonate rocks. Their RIC spectra clearly reflect the marine characteristics of the source rocks and the high maturity of the crude oil. This finding has positive significance for the evaluation of oil and gas in this area.