摘要
古隆起斜坡区的不整合三角带是形成地层圈闭的重要有利区带。以塔北隆起西部白垩系为例,综合利用地震、测井和岩心等资料,识别不整合面,计算不整合面剥蚀量,进行沉积体系识别及有利区带预测。结果表明:塔北隆起西部白垩系发育2个角度不整合(TK、TE)及1个平行不整合(TK1bs);白垩系底部发育卡普沙良群、顶部发育巴什基奇克组,其中,卡普沙良群主要发育三角洲和滨浅湖沉积,巴什基奇克组主要发育辫状河三角洲沉积。卡普沙良群底部发育的上超不整合三角带是有利圈闭发育的重点部位,向古隆起斜坡区上超尖灭的三角洲砂体可作为良好的储集体,与上覆泥岩盖层形成良好的储盖组合;巴什基奇克组顶部遭受剥蚀形成的剥蚀不整合三角带也具有良好的地层圈闭条件,遭受剥蚀的辫状河三角洲砂体可作为优质储层,上覆的古近系膏—泥岩沉积可作为优质盖层。该结果对研究区的下一步油气勘探具有指导意义。
The unconformity triangle zone in the slope area of paleo-uplift is an important favorable zone for formation of stratigraphic traps.Taking the Cretaceous in the West North-Tarim Uplift as an example,comprehensive use of seismic,logging and core data,undertaking unconformity tracking,calculating unconformity denudation,identifying sedimentary systems and predicting favorable zones.The results show that two angular unconformities(TK,TE)and one parallel unconformity(TK1 bs)developed in the Cretaceous in West North-Tarim Uplif,Kapushaliang Group developed at the bottom and Bashijiqike Formation developed at the top of the Cretaceous.The Kapushaliang Group mainly develops delta and shore-shallow lake deposits;the Bashijiqike Formation mainly develops braided river delta deposits.The onlap unconformity triangle belt developed at the bottom of Kapushaliang Group is the key part of the development of the favorable traps,delta sandbodies onlap pinchout in the slope area of the paleo-uplift can be used as good reservoirs,with the overlying mudstone caprock forming agood reservoir-cap combination.The unconformity triangle zone formed by denudation at the top of Bashijiqike Formation also has good stratigraphic trap conditions.The braided river delta sand bodies denuded can be used as high-quality reservoir,the overlying Paleogene gypsum-mudstone deposits can be used as high-quality caprocks.The results have guiding significance for the next step of oil and gas exploration in the study area.
引文
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