鄂尔多斯盆地庆阳地区晚三叠世延长期长8沉积期物源与沉积体系研究<sup>*</sup>

doi:10.7605/gdlxb.2008.03.004

古地理学报 ›› 2008, Vol. 10 ›› Issue (3): 251-259. doi: 10.7605/gdlxb.2008.03.004

• 岩相古地理学及沉积学岩相古地理学及沉积学 • 上一篇下一篇

鄂尔多斯盆地庆阳地区晚三叠世延长期长8沉积期物源与沉积体系研究^*

杨斌虎^1,2 白海强¹ 戴亚权^1,2 查理²,李健^1,2 靳文奇² 刘新菊²

1 西北大学大陆动力学国家重点实验室，陕西西安 710069
2 中国石油长庆油田分公司第一采油厂，陕西延安 716000

收稿日期:2007-11-14 修回日期:2008-03-12 出版日期:2008-06-01 发布日期:2008-06-01
作者简介:杨斌虎，男，1965年生，西北大学博士生在读。现为长庆油田公司第一采油厂高级工程师，主要从事沉积学研究和油田勘探与开发方面的管理工作。
基金资助:
国家重点基础研究发展计划（973计划）“多种能源矿产共存成藏（矿）机理与富集分布规律”项目(编号：2003CB214603)和西北大学地质学系国家基础科学人才培养基地创新基金资助项目（编号：XDCX03-14）联合资助

Provenance and depositional systems during the depositional period of interval 8 of Upper Triassic Yanchang Formation in Qingyang area，Ordos Basin

Yang Binhu^1,², Bai Haiqiang¹, Dai Yaquan^1,2, Zha Li², Li Jian^1,², Jin Wenqi², Liu Xinju²

1 State Key laboratory of Dynamics，Northwest University，Xi'an 710069，Shaanxi
2 The First Petroleum Production Division of PetroChina Changqing Oilfield Company，Yanan 716000，Shaanxi

Received:2007-11-14 Revised:2008-03-12 Online:2008-06-01 Published:2008-06-01
About author:Yang Binhu，born in 1965， is a candidate for doctoral degree in Northwest University and a senior engineer at the First Petroleum Production Division of Changqing Oilfield Company. Now he is engaged in sedimentology and management for hydrocarbon exploration and development.

摘要/Abstract

摘要： 通过野外露头古流向实测，结合砂岩骨架矿物、重矿物组合特征，利用碎屑岩地球化学方法，分析了鄂尔多斯盆地庆阳地区晚三叠世延长期长8沉积期的物源。结果显示，研究区长8沉积期古水流主要为SW→NE方向，次为NW→SE、SE→NW方向；重矿物特征具有明显的分区性。长8油层组的REE配分型式为“右倾型”，δEu值平均0.67；其微量元素协变图特征与盆地西南缘陇西古陆中的陇山群基本一致。推测庆阳地区长8油层组母岩主要来自盆地西南缘陇西古陆中上元古—古生界、祁连造山带花岗岩类和秦岭造山带奥陶系—二叠系，源区母岩主要为变质岩和火成岩。通过野外露头资料，结合最新钻探成果，认为长8沉积期研究区主要为扇三角洲沉积体系，发育扇三角洲前缘亚相和(半)深湖亚相浊积扇，而扇三角洲前缘水下分流河道的砂体带，构成了研究区油气聚集的有利相带。

关键词: 物源分析, 古流向, 扇三角洲, 长8油层组, 庆阳地区, 鄂尔多斯盆地

Abstract: Based on the field outcrop palaeo-current measurements and studies of the sandstone framework mineralogy and heavy mineral assemblages, we utilized clastic rock geochemical methods to define the provenance during the deposition of interval 8 of the Upper Triassic Yanchang Formation in Qingyang area，Ordos Basin. The results show that the palaeo-current in the study area was mainly SW-NE and NW-SE and SE-NW currents were of secondaryimportance. Distribution of heavy minerals is also characterized by obvious zoning patterns. The REE matching pattern of the interval 8 is a “right-declined” type. The average value of δEu is 0.67. The variation characteristics of trace elements are largely consistent with those shown by the Longshan Group of the Longxi Palaeo-land in the southwestern margin of the basin. According to the sandstone clastic components especially the lithic components and heavy mineral characteristics，the source rocks of interval 8 in Qingyang area were mainly derived from the Meso-Proterozoic to Paleozoic of the Longxi Palaeo-land, the granitoids along the Qilian Orogenic Belt and the Ordovician-Permian along the Qinling Orogenic Belt. The detrital source rocks are dominated by metamorphic and igneous rocks. According to the current drilling results combined with the field outcrops，it is proved that the interval 8 of Yanchang Formation was dominated by the fan delta depositional system with fan deltaic front and(semi)deep lacustrine turbidite fan subfacies being developed. The subaqueous distributary channel sandbodies of the delta front constitute the favorable facies belt for petroleum accumulation.

Key words: provenance analysis, palaeo-current, fan delta, interval 8 of Yanchang Formation, Qingyang area, Ordos Basin

中图分类号:

P531

杨斌虎, 白海强, 戴亚权, 查理,李健, 靳文奇, 刘新菊,. 鄂尔多斯盆地庆阳地区晚三叠世延长期长8沉积期物源与沉积体系研究^*[J]. 古地理学报, 2008, 10(3): 251-259.

Yang Binhu, Bai Haiqiang, Dai Yaquan, Zha Li, Li Jian, Jin Wenqi, Liu Xinju. Provenance and depositional systems during the depositional period of interval 8 of Upper Triassic Yanchang Formation in Qingyang area，Ordos Basin[J]. JOURNAL OF PALAEOGEOGRAPHY, 2008, 10(3): 251-259.

http://www.gdlxb.cn/CN/Y2008/V10/I3/251

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鄂尔多斯盆地庆阳地区晚三叠世延长期长8沉积期物源与沉积体系研究*

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