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

作　　者：曹建文[1] 金意志[2] 夏日元[1] 梁彬[1] 邹胜章[1] 

机构地区：[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

出　　处：《中国岩溶》2012年第2期220-226,共7页Carsologica Sinica

基　　金：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)

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。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.

关 键 词：塔河油田 奥陶系 风化壳古岩溶 控制因素 

分 类 号：P618.130.21[天文地球—矿床学]