| 塔河油田4区奥陶系风化壳古岩溶作用标志及控制因素分析 |
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| 引用本文： | 曹建文,金意志,夏日元,梁彬,邹胜章.塔河油田4区奥陶系风化壳古岩溶作用标志及控制因素分析[J].中国岩溶,2012,31(2):220-226. |
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| 作者姓名： | 曹建文 金意志 夏日元 梁彬 邹胜章 |
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| 作者单位： | 1. 中国地质科学院岩溶地质研究所/国土资源部、广西壮族自治区岩溶动力学重点实验室,广西桂林,541004
2. 中国石化西北石油局勘探开发研究院,新疆乌鲁木齐,830011 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）项目：碳酸盐岩缝洞型油藏开采机理及提高采收率基础研究（2011CB201001）; 国土资源部公益性行业科研专项：塔里木盆地古潜山奥陶系风化壳油藏岩溶储层预测（201211082） |
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| 摘 要： | 奥陶系碳酸盐岩是塔河油田的重要勘探领域之一,其储层类型主要为风化壳古岩溶作用下形成的岩溶缝洞系统。通过对塔河油田4区岩心、钻井、录井、测井以及地震等资料进行系统分析,发现研究区内风化壳古岩溶发育,作用标志明显:岩心中具有与原岩岩性不一致的沉积充填物;钻进中常有放空、井漏、井涌等现象发生;测井曲线上各物性参数大幅度变化;地震反射剖面见杂乱反射、弱反射、串珠状反射等特征。研究区风化壳古岩溶发育主要受可溶性岩石、不整合面、风化壳古地貌及古气候等因素控制,其中可溶性岩石和不整合面控制了古岩溶的空间分布,古地貌决定了风化壳古岩溶的深度、范围及强度,古气候决定了古岩溶的总体发育程度,在各因素共同作用下,形成了一系列岩溶缝洞系统。
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| 关 键 词： | 塔河油田 奥陶系 风化壳古岩溶 控制因素 |
| 收稿时间： | 2011/12/29 0:00:00 |
Marks and controlling factors of the paleo-karstification in the Ordovician weathered crust at the 4th block of Tahe oilfield |
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| CAO Jian-wen,JIN Yi-zhi,XIA Ri-yuan,LIANG Bin and ZOU Sheng-zhang.Marks and controlling factors of the paleo-karstification in the Ordovician weathered crust at the 4th block of Tahe oilfield[J].Carsologica Sinica,2012,31(2):220-226. |
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| Authors: | CAO Jian-wen JIN Yi-zhi XIA Ri-yuan LIANG Bin and ZOU Sheng-zhang |
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| Institution: | 1 (1. Institute of Karst Geology, CAGS, Karst Dynamics Laboratory, MLR ＆ GZAR, Guilin, Guangxi 541004, China 2. Reserch Institute of Petroleum Exploration and Development, Northwest petroleum Bureau, Sinopec, Urumqi , Xinjiang 830011, China) |
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| Abstract: | Ordovician carbonate is an important exploration area in Tahe oil field. The major reservoir type is karst seam and hole system in weathered crust formed by paleo-karstification. This paper analyzes core, well drilling, mud-logging, well-logging and seismic datas in the 4th block systematically. It is found that paleo- karst with obvious karst marks is well developed in karst seam and hole system in the study area. The paleo- karst marks including following features, such as infillings that different from the primary lithology in the core ; the phenomena of lost circulation and kicking when drilling ;great changes in physical property parame- ters in well-logging curves; irregular,weak or beaded reflection in seismic reflection profiling. The overall development degree of the paleo-karst is controlled mainly by soluble rock, unconformity plane, paleo land- scape and climate. The spatial distribution of paleo-karst is controlled by soluble rock and unconformities; the weathering range, depth and intensity decided by paleo-landscape; and the paleo-climate decides the total extent of the paleo-karst. A lot of karst seam and hole systems are formed under the influence of these factors. |
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| Keywords: | Tahe oil field Ordovician paleo-karst in weathered crust controlling factors |
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