中国岩溶2012，Vol.31Issue(2)：220-226,7.
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
Marks and controlling factors of the paleo-karstification in the Ordovician weathered crust at the 4th block of Tahe oil field
摘要
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-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.关键词
塔河油田/奥陶系/风化壳古岩溶/控制因素Key words
Tahe oil field/Ordovician/paleo-karst in weathered crust/controlling factors分类
天文与地球科学引用本文复制引用
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):220-226,7.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) （973计划）
