轮古西奥陶系潜山洞穴型岩溶储层发育特征与充填规律  

Development Characteristics and Filling Rule of Ordovician Buried-hill Karst Caved Reservoirs in the West Part of Lungu Oilfield,Tarim Basin

作　　者：李世银[1] 罗春树[1] 邓兴梁[1] 李保华[1] 常少英 王轩[1] 裴广平[1] 

机构地区：[1]中国石油塔里木油田公司勘探开发研究院 [2]中国石油杭州地质研究院

出　　处：《海相油气地质》2012年第2期70-74,共5页Marine Origin Petroleum Geology

摘　　要：洞穴型岩溶储层是塔里木盆地轮古油田缝洞型碳酸盐岩油藏的主要储集空间类型,多数高效井均钻遇大型洞穴型岩溶储层。依据轮古西奥陶系潜山大量单井资料分析,洞穴型岩溶储层可分为充填洞穴、半充填洞穴和未充填洞穴三种类型。结合古地貌精细刻画与岩溶垂向分带成果,认为古地貌位置由岩溶台地向岩溶缓坡和岩溶盆地逐渐降低,而洞穴发育和充填程度在逐渐增高。未充填与半充填洞穴主要发育在岩溶台地和岩溶缓坡的溶峰边坡、溶丘边坡及沟槽谷洼地边坡等地貌单元。表层岩溶带、径流溶蚀带洞穴型岩溶储层发育频率最高,其次为垂直渗滤带和潜流溶蚀带。未充填与半充填洞穴型岩溶储层主要发育在表层岩溶带。Karst caved reservoir is a main types of reservoir space in fractured/vuggy reservoirs in Lungu Oilfield, in which most efficient wells met large karst caved reservoirs in drills. Based on analysis of a large number of data of drilled wells in the western part of Lungu Oilfield, it is shown that the karst caves in Ordovician buried-hill reser- voirs can be divided into filled, partly filled and unfilled ones in type. Combined with fine depiction of paleogeomor- phology and the cognition of vertical karst zoning, it is accounted that the positions of paleolandforms decrease lower with transition from karst platforms to karst gentle slopes and karst basins, and meanwhile development and fillings of caves tend to increase in extent. The unfilled and partly filled karst caves are mainly distributed in （1） karst plat- forms, （2） the side slopes of karst hills in karst gentle slopes, and （3） the slopes in ravines and depressions. The karst cave reservoirs develop most in frequence in epigenic karst zones and runoff dissolved zones, and next common in vertical percolation dissolved zones and groundwater flow zones. The unfilled and partly filled karst caves develop mainly in epigenic karst zones.

关 键 词：塔里木盆地 轮古油田 奥陶系 古潜山油气藏 岩溶型油气藏 储层特征 

分 类 号：TE112.23[石油与天然气工程—油气勘探]