| 新疆库车坳陷克拉苏冲断带白垩系辫状河三角洲沉积特征及其与储集层发育的关系* |
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| 引用本文： | 潘荣,朱筱敏,刘芬,李勇,马玉杰,邸宏利,张荣虎.新疆库车坳陷克拉苏冲断带白垩系辫状河三角洲沉积特征及其与储集层发育的关系*[J].古地理学报,2013,15(5):707-716. |
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| 作者姓名： | 潘荣 朱筱敏 刘芬 李勇 马玉杰 邸宏利 张荣虎 |
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| 作者单位： | 1.中国石油大学(北京)地球科学学院, 北京102249;2.中国石油塔里木油田公司, 新疆库尔勒841000;3.中国石油杭州地质研究院, 浙江杭州310023 |
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| 基金项目： | 国家科技重大专项项目“岩性地层油气藏沉积体系、储集层形成机理与分布研究”专题(编号:2011ZX05001-002)、“大型油气田及煤层气开发”专题(编号:2011ZX05009-002);国家973计划项目“中国西部叠合盆地深部油气复合成藏机制与富集规律”(编号:2011CB201104);国家自然科学基金项目(编号:41272133)联合资助 |
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| 摘 要： | 新疆库车坳陷克拉苏冲断带白垩系巴什基奇克组一、二段是一套由细砂岩、中粗砂岩、含砾砂岩、粉砂岩及泥岩组成的碎屑岩组合。通过30余口钻井(包括6口新取心井)的岩心、测井、录井、薄片及粒度等资料的分析, 结合区域地质资料, 确认克拉苏冲断带巴什基奇克组一、二段发育砂质辫状河三角洲沉积。其岩性以岩屑砂岩为主；粒度概率曲线具有牵引流特征；砂体中发育楔状交错层理及冲刷、充填构造等丰富的强水动力沉积构造及间断正韵律；砂体延伸远、面积大展布稳定, 砂地比值高；发育水下分流河道、分流间湾等微相。据三角洲砂体的岩性、沉积构造及沉积序列等特征, 建立了三角洲沉积模式。稳定的构造背景、开阔的盆地、丰富的物源供给使得研究区辫状河三角洲前缘沉积非常发育, 其以水下分流河道沉积为主体, 物性好, 砂体延伸远, 可向盆地中央方向推进35～60km, 砂体纵横叠置, 为岩性油气藏的形成提供了有利的储集空间。
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| 关 键 词： | 库车坳陷 巴什基奇克组 辫状河三角洲 沉积特征 沉积模式 储集层 |
| 收稿时间： | 03 April 2013 |
Sedimentary characteristics of braided delta and relationship to reservoirs in the Cretaceous of Kelasu tectonic zone in Kuqa Depression,Xinjiang |
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| Pan Rong;Zhu Xiaomin;Liu Fen;Li Yong;Ma Yujie;Di Hongli;Zhang Ronghu.Sedimentary characteristics of braided delta and relationship to reservoirs in the Cretaceous of Kelasu tectonic zone in Kuqa Depression,Xinjiang[J].Journal of Palaeogeography,2013,15(5):707-716. |
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| Authors: | Pan Rong;Zhu Xiaomin;Liu Fen;Li Yong;Ma Yujie;Di Hongli;Zhang Ronghu |
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| Institution: | 1.College of Geosciences, China University of Petroleum(Beijing), Beijing102249;2.Tarim Oilfield Company, PetroChina, Korla841000, Xinjiang;3.Hangzhou Institute of Petroleum Geology, PetroChina, Hangzhou 310023, Zhejiang |
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| Abstract: | The Member 1 and Member 2 of Bashijiqike Formation mainly comprised a set of terrigenous clastic rocks including fine sandstone, moderate-coarse sandstone, pebbled sandstone, siltstone and mudstone of Kelasu tectonic zone in Kuqa Depression, Xinjiang. Based on the analysis of data of well logging, thin section, grain size and core observation of over 30 wells(include 6 new cored wells), together with data of regional geology,|it was confirmed that there existed typical deposits of braided delta in the Bashijiqike Formation in Kelasu tectonic zone. The braided delta was characterized by composition of lithic sandstones, sedimentary structures such as wedge-shaped cross bedding and scour-and-fill tectonic formed by strong hydropower and several non-continuous normal cycles vertically, large sandbodies extended far towards the central basin, high sand-shale ratio, and the main microfacies were braided subaqueous distributary channel and subaqueous inter-distributary channel and mouth bar. According to lithologic characteristics, sedimentary structures and sedimentary sequence of the braided delta, a depositional model for the braided delta was established. The large delta front was well developed in the study area under the stable tectonic backgrounds with open basin and rich sediment supply. Subaqueous distributary channel deposits were well developed with the best physical property, and sand bodies extended towards the center of the basin for 35～60 km with good vertical and horizontal connection, so that it could be favorable reservoir space for lithologic reservoirs. |
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| Keywords: | Kuqa Depression Bashijiqike Formation braided delta sedimentary characteristics depositional model reservoir |
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