| 鄂尔多斯盆地延长组等时地层对比方案与沉积新认识* |
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| 引用本文： | 崔景伟,朱如凯,徐旺林,孙远实,毛治国,白斌.鄂尔多斯盆地延长组等时地层对比方案与沉积新认识*[J].古地理学报,2023,25(1):93-104. |
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| 作者姓名： | 崔景伟 朱如凯 徐旺林 孙远实 毛治国 白斌 |
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| 作者单位： | 1.中国石油勘探开发研究院,北京 100083;2.中国石油油气储层重点实验室,北京 100083 |
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| 基金项目： | *中国石油“十四五”前瞻性基础性重大科技项目(编号: 2021DJ04)资助 |
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| 摘 要： | 鄂尔多斯盆地三叠系延长组石油年产量超3500×104t,然而该主力产层现行的“标志层约束、油层组等厚劈分”划分方案,在油气勘探开发实践中受到挑战。作者利用不同沉积体系长7油层组内凝灰岩定年数据和盆地庆城北地区新采集的高品质三维地震数据体,开展同位素年代学研究和钻井资料约束下的高精度地震地层解释。锆石定年结果表明盆地东南部长7油层组属于中三叠世,锆石ID-TIMS定年可实现不同沉积体系高精度地层对比。同时,在庆城北三维工区延长组长2油层组底至长73油层组顶解释识别出11个前积地质体,刻画出长7油层组中6个前积体进积演化规律。针对延长组陆相地层等时划分难点,提出建立不同物源体系长7油层组高精度地层定年“锚点”,利用提频地震数据与测井小层对比“穿线”,重新划分高频层序“格架”,建立延长组地层“等时”对比方案。该研究有助于延长组油藏分布规律的认识,也为其他陆相湖盆沉积演化和地层等时对比提供了可资借鉴的范例。
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| 关 键 词： | 前积体 地层对比 U-Pb定年 延长组 三叠系 鄂尔多斯盆地 |
| 收稿时间： | 2022-02-18 |
New cognition and isochronous stratigraphic division scheme of the Yanchang Formation sedimentation in Ordos Basin |
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| CUI Jingwei,ZHU Rukai,XU Wanglin,SUN Yuanshi,MAO Zhiguo,BAI Bin.New cognition and isochronous stratigraphic division scheme of the Yanchang Formation sedimentation in Ordos Basin[J].Journal of Palaeogeography,2023,25(1):93-104. |
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| Authors: | CUI Jingwei ZHU Rukai XU Wanglin SUN Yuanshi MAO Zhiguo BAI Bin |
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| Institution: | 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;2.Key Laboratory of Petroleum Reservoir,PetroChina,Beijing 100083, China |
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| Abstract: | The annual oil production of the Triassic Yanchang Formation in the Ordos Basin exceeds 3500×104 t. However,the current division scheme of “marker layer constraints and equal-thickness splitting of oil formations”for this main production layer is challenged in the practice of oil and gas exploration and development. Using the dating data of tuffs in the Chang 7 interval of different sedimentary systems and the high-quality 3D seismic data volume newly collected in the Qingchengbei area of the basin,stratigraphic isotopic chronology studies and high-precision seismic stratigraphic interpretation under the constraints of drilling data were carried out respectively. The zircon dating results show that the Chang 7 interval in the southeast of the basin belongs to the Middle Triassic,and it is suggested that zircon ID-TIMS dating can achieve high-precision stratigraphic correlation of different sedimentary systems. At the same time,11 prograding bodies were identified from the bottom of Chang 2 interval to the top of Chang 73 interval in Yanchang Formation in North Qingcheng 3D work area,and the evolution of six prograding bodies in Chang 7 interval was described. Aiming at the difficulty of isochronous division of continental strata in the Yanchang Formation,it is proposed to establish high-precision stratigraphic dating “anchor points” for the Chang 7 interval of different provenance systems,and use the elevated frequency seismic data to compare with well logging small layers to “mathch” and re-divide the high-frequency layers. The sequence “framework” was established,and the isochronous comparison scheme of the Yanchang Formation was established. This study is helpful for summarizing the oil distribution law of Yanchang Formation,and also provides a reference for the sedimentary evolution and stratigraphic isochronous comparison of other continental lacustrine basins. |
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| Keywords: | progradation body stratigraphic correlation U-Pb dating Yanchang Formation Triassic Ordos Basin |
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