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

曹建文; 金意志; 夏日元; 梁彬; 邹胜章

doi:10.3969/j.issn.1001-4810.2012.02.017

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

doi: 10.3969/j.issn.1001-4810.2012.02.017

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
2.
中国石化西北石油局勘探开发研究院

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)及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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出版历程
- 收稿日期: 2011-12-29
- 发布日期: 2012-06-25

Marks and controlling factors of the paleo-karstification in the Ordovician weathered crust at the 4th block of Tahe oilfield

1.
Institute of Karst Geology, CAGS, Karst Dynamics Laboratory, MLR & GZAR
2.
Reserch Institute of Petroleum Exploration and Development, Northwest petroleum Bureau, Sinopec

摘要

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。
- 塔河油田 /
- 奥陶系 /
- 风化壳古岩溶 /
- 控制因素
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 parameters 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 landscape and climate. The spatial distribution of paleo-karst is controlled by soluble rock and unconformities; the weathering range, depth and intensity decided by paleo-land scape; and the paleo-climate decide the total extent of the paleo-karst. A lot of karst seam and hole systems are formed under the influence of these factors.
- Tahe oilfield /
- Ordovician /
- paleo-karst in weathered crust /
- controlling factors

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