塔中奥陶系优质储集层特征及断裂控制作用  

Characteristics of high quality Ordovician reservoirs and controlling effects of faults in the Tazhong area,Tarim Basin

作　　者：罗春树[1,2] 杨海军[2,3] 李江海[1] 谢会文[2] 黄广建[2] 

机构地区：[1]北京大学地球与空间科学学院 [2]中国石油塔里木油田公司勘探开发研究院 [3]中国地质大学(北京)

出　　处：《石油勘探与开发》2011年第6期716-724,共9页Petroleum Exploration and Development

基　　金：国家科技重大专项"塔中碳酸盐岩礁滩型和层间岩溶型凝析气藏高效勘探开发"示范工程(2011ZX05049)

摘　　要：塔中北坡上奥陶统礁滩体和下奥陶统鹰山组风化壳为两套优质储集层,早期分别受台地边缘高能相带和早奥陶世风化壳的控制,后期受到断裂活动的整体改造。综合研究认为,塔中北坡奥陶系储集层的类型和分布规律均与断裂活动有关。塔中奥陶系两套优质储集层受3期重要断裂运动的控制:早奥陶世末的区域拉张奠定了塔中I号坡折带形成的基础,促进了下奥陶统鹰山组风化壳岩溶储集层的形成及随后上奥陶统礁滩体的沉积;奥陶纪末的大规模挤压运动促使塔中北坡发育盐相关构造(沿中寒武统的膏盐层产生滑脱与盐拱),断裂同时改造礁滩体和风化壳储集层;志留纪末的走滑断裂活动对奥陶系储集层的改造有限,却控制着喜马拉雅期塔中奥陶系气侵的部位。The exploration during recent years in the northern slope of the Tazhong area,Tarim Basin,indicates that the Ordovician strata have two sets of high quality reservoir,i.e.the Upper Ordovician reef-beach body and the Yingshan Formation weathering crust of the Lower Ordovician,which were respectively controlled by high energy facies at platform edges and early Ordovician weathering crust in the early period and modified by faulting in the later period.Comprehensive research shows that the types and distribution rules of Ordovician reservoirs in the northern slope of the Tazhong area are related to faulting.This paper demonstrates the controlling effects of three periods of faulting on the above two sets of Ordovician high quality reservoirs：（1） The Early Ordovician regional extension laid the foundation for the formation of Tazhong No.1 slope break and led to the formation of the Yingshan weathering curst karst reservoirs in Lower Ordovician and the subsequent sedimentation of Upper Ordovician reef-beach bodies;（2） The intense compression at the end of Early Ordovician promoted the development of salt related structures in the northern slope（the detachment and salt arch occurred in the Middle Cambrian gypsum）,and faults modified the reservoirs of reef-beach bodies and weathering crust;（3） The Late Silurian strike-slip faulting had limited modification to the Ordovician reservoir,but controlled the location of gas cutting in Ordovician reservoirs in the Tazhong area in the Himalayan period.

关 键 词：碳酸盐岩 礁滩体 风化壳 塔中Ⅰ号断裂 滑脱 盐拱 走滑断裂 

分 类 号：TE121.1[石油与天然气工程—油气勘探]