| 塔里木盆地东河砂岩沉积和储层特征及综合分析 |
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| 引用本文： | 贾进华,张宝民,朱世海,朱运成,李占银.塔里木盆地东河砂岩沉积和储层特征及综合分析[J].古地理学报,2006,8(3):339-352. |
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| 作者姓名： | 贾进华 张宝民 朱世海 朱运成 李占银 |
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| 作者单位： | 中国石油勘探开发研究院，北京 100083 |
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| 基金项目： | 中国石油塔里木油田公司勘探生产项目(2004)的部分研究成果 |
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| 摘 要： | 东河砂岩是一套海侵初期的沉积产物，东河砂岩不是一个等时沉积体，相当于晚泥盆世晚期至早石炭世早期沉积，具体沉积时间各地有差异。由于东河砂岩是覆盖广泛的海侵初期沉积，因此具有海侵初期填平补齐的特征，其沉积相决定于海侵的速度、沉积物的供给和海侵前的古地貌。塔北地区受塔北古隆起的阻挡，海水在古隆起周围滞留时间较长，又有较粗粒的物源供给，其沉积产物主要是滨岸海滩沉积；塔中地区由于地形复杂，沉积类型也比较复杂，底部砾岩段有河流相沉积，而块状砂岩段和砂砾岩段有河口湾和滨岸海滩沉积，不同段在成分、分选性和粒级上有较大的差异；而其它低平地区主要是海侵期快速的滨岸和陆架沉积。受沉积因素影响，东河砂岩有效储层的分布具有地域性；除沉积因素外，低的地温梯度和短期的深埋藏是优质储层发育的重要控制因素。
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| 关 键 词： | 塔里木盆地 志留纪 地层 沉积特征 岩相古地理 |
| 文章编号： | 1671-1505（2006）03-0339-14 |
| 收稿时间： | 2005-11-10 |
| 修稿时间： | 2006-01-10 |
Stratigraphy, sedimentary characteristics and lithofacies palaeogeography of the Silurian in Tarim Basin |
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| Jia Jinhua,Zhang Baomin,Zhu Shihai,Zhu Yuncheng,Li Zhanyin.Stratigraphy, sedimentary characteristics and lithofacies palaeogeography of the Silurian in Tarim Basin[J].Journal of Palaeogeography,2006,8(3):339-352. |
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| Authors: | Jia Jinhua Zhang Baomin Zhu Shihai Zhu Yuncheng Li Zhanyin |
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| Institution: | Research Institute of Petroleum Exploration and Development, Beijing 100083 |
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| Abstract: | A great attention has been repaid to the study of the Silurian in the Tarim Basin due to the discovery of petroleum in the interval,but there still exists some basic geologic problems which hinder the exploration. Based on the division and correlation of different lithologic members between the field outcrops and the wells,the depositional systems and sedimentary facies and microfacies of these members have been studied in detail. Then,the lithofacies palaeogeographic evolution of the Silurian in the Tarim Basin has been reconstructed. According to the stratigraphic and sedimentary developing features,the Silurian in the Tarim Basin can be divided into Keping-Tazhong and Tadong stratigraphic regions,and be subdivided into six stratigraphic sub regions including Keping,Bachu,Tazhong,Tabei,Mandong and Yingjisu. Mainly four types of depositional systems were developed in the Silurian in the Tarim Basin.They were the shore-neritic shelf system,detrital tidal flat (intercalated tempestites),detrital tidal flat-shore composite and braided delta systems. Sedimentary facies are dominated by detrital tidal flat,shore beach,offshore subaqueous sand bar,neritic shelf and braided delta.The Tarim Basin experienced a process of marine domain gradually decreasing and paleoclimate changing from warm and humid to hot and dry during the Silurian.The topography of the Silurian basin was higher in the south and lower in the north and the sediments mainly came from Tadong and Tadongnan areas.There were a relatively shallow and extensive waterbody in western area,and a relatively euxinic body in eastern area.Marine transgression was from the north and northwest.The palaeoenvironmental and palaeogeographic characters show that subtidal channel and bar sandbodys were developed along the shore-line.Although the single sandbody was thin,relatively abundant sandbody assemblages can be formed by the vertical stacking of many sets of single sandbodys.Thus the geologic conditions for forming litho-stratigraphic traps are favorable. |
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| Keywords: | Tarim Basin Silurian stratigraphy sedimentary characteristics lithofacies palaeogeography |
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