| 陕北地区延长组层序地层划分与含油气性 |
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| 引用本文： | 杨雷,梅志超,熊伟.陕北地区延长组层序地层划分与含油气性[J].古地理学报,2001,3(3):83-88. |
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| 作者姓名： | 杨雷 梅志超 熊伟 |
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| 作者单位： | [1]石油大学（北京）盆地中心;
[2]西北大学地质系;
[3]胜利石油管理局 |
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| 摘 要： | 陕北地区上三叠统延长组是以河流－湖泊沉积体系为主的陆源碎屑岩系。依据野外剖面和井下资料，本文对陕北地区上三叠统延长组进行了层序地层划分，共划分出了四个三级层序，其中一个属于湖相层序，另外三个为冲积层序。每个层序包括三个体系域，它们分别是低位体系域、水进体系域和高位体系域，每个体系域由不同的相组合构成，呈现不同的堆砌样式。湖相层序和冲积层序的层序界面和层序内部单元的构成特征均不相同。由于河流冲刷在陆相地层中普遍发育，以冲刷面为层序界面时要综合考虑多种因素进行综合判断，如砂体厚度的展布和相的构成等，而且纵向的比较也很重要，纵向的相变是划分陆相层序的一个重要标志。最大洪泛面和水进面在冲积地层中较难确定，往往以一套地层的出现为标志，而不是某个单层为代表。在陕北地区延长组陆相层序地层中，控制层序形成的主要因素是构造运动和气候变化。陕北地区陆相层序对盆地含油气性的控制主要表现在三个方面：1、层序控制了生储盖的组合；2、层序控制着储层的展布；3、层序影响着储层的储集性能。
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| 关 键 词： | 陕北地区 延长组 层序地层 含油气性 |
| 文章编号： | 1671-1505-(2001)03-0083-6 |
| 修稿时间： | 2000年9月26日 |
STRATIGRAPHIC SEQUENCE AND PETROLIFEROUS CHARACTERS OF YANCHANG GROUP IN NORTH SHAANXI PROVINCE |
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| Yang lei,Mei zhichao,Xiong Wei.STRATIGRAPHIC SEQUENCE AND PETROLIFEROUS CHARACTERS OF YANCHANG GROUP IN NORTH SHAANXI PROVINCE[J].Journal of Palaeogeography,2001,3(3):83-88. |
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| Authors: | Yang lei Mei zhichao Xiong Wei |
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| Institution: | Petroleum Un.;
Northwest Un. ;
Shengli Petroleum Bureau |
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| Abstract: | Based on the outcrop and underground data, four 3 order sequences are recognized in the Yanchang Group of Upper Triassic in North Shaanxi Province. The Yanchang Group is continental clastic sediment composed of fluvial and lacustrine system. The first one of these four sequences is lacustrine sequence while others are fluvial ones. According to the surfaces and genetic units of sequence,every stratigraphic sequence can be divided into three parts of low stand systems,transgressive systems and high stand systems. The fluvial sequence developed overflow and marshy sediments during maximum flooding period while the lacustrine sequence developed dark shale. Sequence boundary is the key to recognize sequence on which developed thick multi storey sandstone. To determine the sequence boundary is challenge because the fluvial surface is so normal in continental sediments,and using comprehensive ways is necessary. The main control factors of sequence formation are tectonics and climate change in continental sequences of Yanchang Group in North Shaanxi Province. The controls of continental sequence on petroliferous characters imply following aspects:1) the control on the assemblage of source, reservoirs and caps;2) the control on distribution of reservoirs; and 3) the control on performance of reservoirs. |
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| Keywords: | North Shaanxi Yanchang Group sequence depositional systems petroliferous characters |
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