JOURNAL OF PALAEOGEOGRAPHY ›› 2011, Vol. 13 ›› Issue (4): 443-455. doi: 10.7605/gdlxb.2011.04.008

• PALAEOGEOGRAPHY AND MINERAL RESOURCES • Previous Articles     Next Articles

Sedimentary facies of the Middle-Upper Triassic Yanchang Formation in Ordos Basin and breakthrough in petroleum exploration

Deng Xiuqin1,2,3, Fu Jinhua1,2, Yao Jingli1,2, Pang Jinlian1,2, Sun Bo1,2   

  1. 1 Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company，Xi'an 710018，Shaanxi
    2 National Engineering Laboratory for Exploration and Development of Low-permeability Oil & Gas Fields，Xi'an 710018，Shaanxi
    3 Key Laboratory for Continental Dynamics of Ministry of Education，Northwest University，Xi'an 710069，Shaanxi
  • Received:2010-08-10 Revised:2011-01-26 Online:2011-08-01 Published:2011-08-01
  • About author:Deng Xiuqin，born in 1972，is a Ph.D.candidate of Northwest University, and is a senior engineer in Research Institute of Exploration and Development，PetroChina Changqing Oilfield Company. Now she is engaged in oil and gas geology research.E-mail: dxq1_cq@petroChina.com.cn.

鄂尔多斯盆地中及上三叠统延长组沉积相与油气勘探的突破*

邓秀芹1,2,3 付金华1,2 姚泾利1,2 庞锦莲1,2 孙勃1,2   

  1. 1 中国石油长庆油田分公司勘探开发研究院，陕西西安 710018
    2 低渗透油气田勘探开发国家工程实验室，陕西西安 710018
    3 西北大学大陆动力学教育部重点实验室，陕西西安 710069
  • 作者简介:邓秀芹，女，1972年生，西北大学博士研究生，现为中国石油长庆油田公司高级工程师，从事沉积学及油气地质研究。E-mail: dxq1_cq@petroChina.com.cn。
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”（编号：2011ZX05044，2011ZX05001-004）资助

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Abstract: The Ordos Basin lies across Shaanxi，Gansu，Ningxia，Inner Mongolia and Shanxi Provinces of middle-western China.Its area reaches 2.5×105 km2.The Middle-Upper Triassic Yanchang Formation，more than 1000 m thick，is widely developed in the basin.Alluvial fan，fluvial，delta and lacustrine facies developed well during the Middle and Upper Triassic，and formed the key oil- and gas-bearing layers of the basin.According to the data collected from more than 100 drilling wells in the hinterland basin and many outcrops in the surrounding areas，as well as the long-term exploration and research experiences，we compiled 7 sedimentary facies maps of different oil-bearing intervals of the Middle-Upper Triassic Yanchang Formation of the Ordos Basin.The features of sedimentary facies in different depositional periods of the Yanchang Formation，especially the distribution and evolution of the dark mudstone and shale of the deltas and lacustrine facies，as well as the sand body of the various strand-bars and the gravity flow facies，were illustrated in detail.By the theoretical guidance of the sedimentary facies and lithofacies palaeogeography，the oil exploration of the Yanchang Formation has made great breakthrough constantly in the Ordos Basin.Several large oilfields，with the proved reserve more than 1×108t，such as Shanbei，Xifeng，Jiyuan and Huaqing oilfields，have been discovered in recent years.

Key words: Ordos Basin, Yanchang Formation, sedimentary facies, sedimentary evolution, petroleum exploration

摘要： 鄂尔多斯盆地位于中国的中西部，跨陕、甘、宁、蒙、晋5省区，盆地本部面积25万km2。中及上三叠统延长组在盆地内广为展布，厚逾千米，发育冲积扇、河流、三角洲、湖泊等沉积相，是该地区重要的油气产层。根据盆地腹地100多口井的钻井资料及盆地周边地区的露头资料，以及长庆油田长时期对延长组的油气勘探经验，编制出了鄂尔多斯盆地中及上三叠统延长组各油层组的沉积相图7幅，详细阐述了各油层组沉积时期的沉积相展布及演化，尤其是三角洲相、湖泊相以及其中的暗色泥岩和页岩、各种滩坝砂体及重力流砂体的展布及演化。在沉积相及岩相古地理理论的指导下，鄂尔多斯盆地延长组的油气勘探不断获得重大突破，相继发现了陕北、西峰、姬塬、华庆等亿吨级大油田。

关键词: 鄂尔多斯盆地, 延长组, 沉积相, 沉积演化, 石油勘探

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