Age and Potential Petroleum Resources of Dongpo Formation in North China Craton
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摘要: 近年来,随着新区、新层系油气勘探研究工作的不断深入,华北克拉通周缘分布的新元古代-寒武纪过渡时期海相细粒碎屑岩作为优质烃源岩而逐渐受到关注.目前,关于该套海相优质烃源岩的油气评价工作多集中于华北克拉通南缘并已取得重要进展,而关于克拉通西缘-西南缘等效地层的油气评价工作亟待开展.同时,由于缺乏精确的生物地层学和年代地层学数据,关于该套海相烃源岩的形成时代以及时空对比关系尚存在较大争议,制约着油气基础调查工作的进一步开展.此次研究中,埃迪卡拉纪晚期特有化石Shaanxilithes在华北克拉通西南缘(陕西洛南、陇县地区)东坡组中发现,进一步扩大了该化石的古地理分布范围,同时可将该地区东坡组的时代约束在埃迪卡拉纪晚期.在此基础上,对新元古代海相细粒碎屑岩东坡组的构造-沉积背景和时空对比关系进行讨论,该研究也将为“新层系”页岩气勘探工作提供新的思路和参考.Abstract: With the development of petroleum exploration in new areas and new strata, the extensive distribution of Neoproterozoic-Cambrian marine fine-grained clastic rocks along the western-southwestern-southern margins of North China craton(NCC) has been attracted more and more attention as the high-quality source rocks of hydrocarbon. The related resource evaluation has been carried out along the southern margin of NCC and made significant progress, but little attention has been paid for the equivalent horizons along the western-southwestern margins of NCC. Because of lacking accurate biostratigraphic and chronostratigraphic data, the age and spatiotemporal correlation of those rocks as mentioned above have been poorly documented. The new finding of the typical late Ediacaran fossil Shaanxilithes from the Dongpo Formation along the southwestern margin of the NCC(Luonan and Longxian areas, Shaanxi Province), greatly extends its paleogeographic distribution and provides the convincing evidence for determining the age of the Dongpo Formation. Based on the new biostratigraphic evidence, it evaluates the tectonic depositional setting and spatiotemporal correlation of the late Ediacaran Dongpo Formation, which also has the great potential to be the important target horizons for the "new series" shale gas.
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Key words:
- North China craton /
- Dongpo Formation /
- biostratigraphy /
- potential petroleum resources
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图 1 东坡组和罗圈组及其等效地层在华北克拉通西缘-西南缘-南缘的分布(a)(古地理图修改自王鸿祯,1985);陕西洛南石坡镇地区地质简图及剖面位置(b);陕西陇县景福山地区地质简图及剖面位置(c)
Fig. 1. Distribution of the Dongpo Formation and Luoquan Formation, and their equivalent strata along the western-southwestern-southern margins of NCC (a) (paleogeographic map modified from Wang, 1985); geological map of the Shipo town (Luonan county, Shaanxi Province), showing the location of studied section (b); geological map of the Jingfushan aera (Longxian county, Shaanxi Province), showing the location of studied sections (c)
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