塔里木盆地塔河油田奥陶系碳酸盐岩油气成藏特征  

Study on the hydrocarbon reservoir forming characteristics of the Ordovician carbonate rock in Tahe Oilfield,Tarim Basin

作　　者：杨宁[1] 吕修祥[1] 陈梅涛[2] 

机构地区：[1]中国石油大学(北京)盆地与油藏研究中心 [2]中国石油化工股份有限公司,北京100029

出　　处：《西安石油大学学报（自然科学版）》2008年第3期1-5,共5页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家重点基础研究发展规划项目(973);“中国海相碳酸盐岩层系油气富集机理与分布预测”(编号:2005CB422108)资助

摘　　要：塔里木盆地塔河油田碳酸盐岩储层主要发育于奥陶系,油气储量丰富,对其油气藏的研究表明,奥陶系碳酸盐岩的主要油源区为南东方向的满加尔寒武—奥陶系生油坳陷,其生成的多期次油气通过断裂、储层、不整合面持续向北部凸起之上的奥陶系储层运移聚集.同时多期次的运聚与成藏造成了油气在平面上分布具有北东密度大、南西密度小的特点.塔河油田碳酸盐岩孔、洞、缝3种储集空间组合构成裂缝型、孔洞-裂缝型、裂缝-孔洞型和生物礁(滩)相孔隙型储层,为油气聚集提供了良好的储集空间.海西期的构造活动使得裂缝发育,同时为岩溶发育提供通道,并进一步改善了早期缝洞的连通性.石炭系卡拉沙依组及巴楚组泥岩作为良好的区域盖层为油气保存提供了必要条件.The carbonate reservoir in Tahe Oilfield mainly develops in the Ordovician,and its hydrocarbon reserves is abundant.The study on the hydrocarbon reservoirs shows that the hydrocarbon sources of the Ordovician carbonate rock are mainly from Manjiaer oil generating depression of Cambrian-Ordovician in the southeast of the oilfield and the hydrocarbon generated in multi-stages continuously migrates through faults,reservoirs and unconformities and accumulates in the Ordovician reservoir located in the upper part of the northern uplift.Furthermore,the multi-stages migration and accumulation causes a hydrocarbon distribution characteristic in plane:the density of the hydrocarbon in the northeast is greater and that in the southwest is less.There are three reservoir space types of pore,hole and fracture,and they form four reservoir types of fracture type,pore and hole--fracture type,fracture--pore and hole type,and organic reef (bank) pore type,which provides the excellent reservoir spaces for the accumulation of the hydrocarbon.The structural activity in Hercynian makes the fractures developed,and which provides the channels for the formation of karst,and improves the connectivity of earlier fractures and holes furthermore.The Kalashayi formation and Bachu formation of Carboniferous are excellent regional cap rocks and provide a necessary condition for the preservation of hydrocarbon.

关 键 词：塔里木盆地 塔河油田 碳酸盐岩 油气成藏特征 

分 类 号：TE122.3[石油与天然气工程—油气勘探]