塔中地区下奥陶统岩溶风化壳储层特征与勘探领域  

CHARACTERISTICS AND EXPLORATION FIELDS OF PALEO-KARST RESERVOIRS AT THE TOP OF EARLY ORDOVICIAN IN CENTRAL TARIM UPLIFT

作　　者：苗继军[1] 贾承造[2] 邹才能[2] 邓述友[3] 苟柱明[3] 宋玉斌[3] 侯向辉[3] 

机构地区：[1]中国石油大学(北京)盆地与油藏研究中心,北京102249 [2]中国石油勘探开发研究院,北京100083 [3]中国石油塔里木油田分公司,新疆库尔勒841000

出　　处：《天然气地球科学》2007年第4期497-500,606,共5页Natural Gas Geoscience

摘　　要：继在塔里木盆地塔中地区塔中Ⅰ号带上奥陶统发现含油气礁滩体[资源量约（3～5）×10^8t油当量]之后，又在其下奥陶统顶部风化壳获重大油气勘探突破。指出塔中地区下奥陶统风化壳岩溶为加里东中期构造运动的产物，分布广泛，溶蚀孔洞与裂缝发育，储集条件良好，呈准层状展布；上奥陶统含泥灰岩与下奥陶统岩溶储层可以构成有利的储盖组合，具有油气大规模聚集的有利地质基础。认为塔中地区北部斜坡区成藏条件较有利，资源潜力大，是近期天然气勘探的现实领域。The oil and gas discoveries in the early Ordovician paleo-karst reservoirs are another big breakthrough, after the reef-shoal complex reservoirs were found in the Tarim basin. The Paleo-karst reservoirs were the result of middle Caledonian tectonic movements happened in middle Ordovician. Solution cavities, corrosion holes, and fractures were developed, which made it possible to collect and accumulate hydrocarbons along the top of the early Ordovician Yinshan Formation. The paleo-karst reservoirs extended along the top of the early Ordovician Yingshan Formation in cross sections, and spread over a considerable extent, so that the paleo-karst reservoirs of the Yinshan Formation had abilities to form large-scale hydrocarbon accumulations. Analyses of hydrocarbon accumulations indicate that the potential for oil and gas entrapment in the northern slope of Central Tarim uplift is much better than other areas.

关 键 词：碳酸盐岩 风化壳 岩溶作用 储层 油气勘探 塔里木盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]