| 青海砂西油田古近系下干柴沟组下部沉积相定量研究 |
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| 引用本文： | 金振奎,张响响,邹元荣,王邵华,明海慧,周新科,杜社卿.青海砂西油田古近系下干柴沟组下部沉积相定量研究[J].古地理学报,2002,4(4):99-108. |
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| 作者姓名： | 金振奎 张响响 邹元荣 王邵华 明海慧 周新科 杜社卿 |
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| 作者单位： | 石油大学资源与信息学院地球科学系 北京昌平102249 |
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| 摘 要： | 随着油田开发难度的加大，开发中仅仅把储集砂体的沉积相类型确定下来是远远不够的，还要求准确地预测砂体的宽度、长度等定量参数，这就是本文所指的沉积相定量研究。本文根据大量钻井资料，在地层精细划分对比的基础上，对青海砂西油田E31辫状河三角洲平原和曲流河三角洲平原进行了定量研究，确定了分流河道砂体的宽度、宽/厚比等参数。研究表明，本区辫状河三角洲平原的分流河道砂体宽多为 1200-3000m，厚多为5-10m，宽/厚比200-280。曲流河三角洲平原的分流河道砂体宽多为 400-700m，厚多为3-6m，宽/厚比80-110。辫状分流河道砂体比曲流分流河道砂体普遍宽、厚是由于辫状分流河道频繁摆动改道引起砂体的横向拼合和垂向叠置所致。这种河道可称复合河道。利用“厚度中心法”可区分复合河道与单河道。由于不同沉积相的砂体宽度不同，在油田开发中井网部署方案应该不同。
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| 关 键 词： | 青海 砂西油田 古近系 下干柴沟组 沉积相 定量研究 厚度中心法 |
| 文章编号： | 1671-1505(2002)04-0099-10 |
QUANTITATIVE STUDY OF SEDIMENTARY FACIES OF THE LOWER PART OF XIAGANCHAIGOU FORMATION OF PALEOGENE OF SHAXI OILFIELD IN QINGHAI PROVINCE |
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| Jin Zhenkui,Zhang Xiangxiang,Zhou Yuanrong,Wang Shaohua,Ming Haihui,Zhou Xinke,Du Sheqing.QUANTITATIVE STUDY OF SEDIMENTARY FACIES OF THE LOWER PART OF XIAGANCHAIGOU FORMATION OF PALEOGENE OF SHAXI OILFIELD IN QINGHAI PROVINCE[J].Journal of Palaeogeography,2002,4(4):99-108. |
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| Authors: | Jin Zhenkui Zhang Xiangxiang Zhou Yuanrong Wang Shaohua Ming Haihui Zhou Xinke Du Sheqing |
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| Institution: | Department of Geosciences, University of Petroleum, Beijing 102249 |
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| Abstract: | Now in the development of oilfields, it is far from enough to determine only the sedimentary facies of sandbodies, and the width, length and other parameters of the sandbodies should be predicted precisely.—This is quantitative study of sedimentary facies referred to in this paper. On the basis of drilling data and fine division and correlation of strata, quantitative study was made on the sedimentary facies of the lower member of Lower Tertiary Xiaganchaigou Formation of Shaxi Oilfield, Qinghai Province. The lower member of the Ganchaigou Formation consists of clastic rocks, about 250m thick. It is divided into four oil-containing formation sets, i.e. I, II, III and IV. Formation set IV is deposited in delta plain environments of a braided river delta, and formation sets I, II and III are deposited in delta plain environments of a meandering river delta. In the delta plain of the braided river delta, sandbodies are mainly deposited in distributary channels. These sandbodies are wide ribbons in shape and SW-NE in trend. They are commonly 1200-3000m wide and 5-10m thick. Their width/thickness is commonly 200-280. In the delta plain of the meandering river delta, sandbodies are mainly deposited in distributary channels. These sandbodies are narrow ribbons in shape. They are commonly 400-700m wide and 3-6m thick. Their width/thickness is commonly 80-110. Sandbodies of the braided delta plain are wider and thicker than those of meandering delta plain. This is because frequent shifting of braided distributary channels leads to lateral combining and vertical superimposing of sandbodies. Due to diffenrent width of sandbodies of different facies, inter-well distance of development wells should be different for braided delta plain and meandering delta plain. |
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| Keywords: | Qinghai Shaxi Oilfield Paleogene Xiaganchaigou Formation sedimentary facies quantitative study braided delta plain meandering delta plain |
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