伊拉克哈法亚油田中白垩统Mishrif组MB1-2亚段沉积与储集层构型  

Sedimentary and reservoir architectures of MB1-2 sub-member of Middle Cretaceous Mishrif Formation of Halfaya Oilfield in Iraq

作　　者：孙文举 乔占峰 邵冠铭 孙晓伟 高计县[2] 曹鹏 张杰[3,4] 陈万钢 SUN Wenju;QIAO Zhanfeng;SHAO Guanming;SUN Xiaowei;GAO Jixian;CAO Peng;ZHANG Jie;CHEN Wangang(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;China United Coalbed Methane Corp.,Ltd.,Beijing 100011,China;PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;CNPC Key Laboratory of Carbonate Reservoir,Hangzhou 310023,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中联煤层气有限责任公司,北京100011 [3]中国石油杭州地质研究院,杭州310023 [4]中国石油天然气集团有限公司碳酸盐岩储层重点实验室,杭州310023

出　　处：《石油勘探与开发》2020年第4期713-722,共10页Petroleum Exploration and Development

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05004-002)。

摘　　要：基于岩心、铸体薄片、测井、地震等资料,研究伊拉克哈法亚油田中白垩统Mishrif组MB1-2亚段沉积与储集层构型。Mishrif组MB1-2亚段发育潟湖相、生屑滩相和潮道相3种微相类型,沉积微相构型受层序地层约束。四级层序内,潟湖相垂向加积叠置生长,生屑滩呈透镜状镶嵌于潟湖背景中,层序沉积末期被形似“曲流河”的潮道切割,代表沉积间断面。发育潮道颗粒-泥粒灰岩储集层、生屑滩颗粒-泥粒灰岩储集层和潟湖粒泥灰岩溶蚀改造型储集层3种类型,其中潮道颗粒-泥粒灰岩储集层和生屑滩颗粒-泥粒灰岩储集层构型与沉积构型一致;潟湖粒泥灰岩溶蚀改造型储集层构型受微相构型与溶蚀改造共同控制,发育于层序界面之下。储集层段主要发育于四级层序高位域,垂向上被海侵域隔层分隔,复杂的微相构型与溶蚀改造导致储集层段表现为“阁楼式”构型特征,内部具复杂的渗流关系。研究成果对中东地区同类油藏开发具有指导意义。Based on comprehensive analysis of core,cast thin section,logging and seismic data,the sedimentary and reservoir architectures of the MB1-2 sub-member of Mishrif Formation in Halfaya Oilfield,Iraq,are studied.The MB1-2 sub-member of Mishrif Formation has three types of microfacies,lagoon,bioclastic shoal,and tidal channel,and facies architecture controlled by sequence stratigraphy.In the 4th order sequence,the lagoon facies aggradated vertically,and the bioclastic shoals in lenticular shape embed in the background of lagoon,the end of the sequence is incised by the"meandering river"shape tide channel,which represents the depositional discontinuity.Three types of reservoirs including tidal channel grainstone to packstone reservoirs,bioclastic shoal grainstone to packstone reservoirs and dissolved lagoon wackestone reservoirs are developed.The reservoir architectures within tidal channel and bioclastic shoal are strickly controlled by grainy facies,whereas the dissolved lagoon reservoirs controlled by both facies and dissolution are related to the sequence boundary.The reservoir sections occur mainly in the 4th sequence highstand systems tract(HST)and are separated by barriers formed in the transgressive systems tract(TST).Complicated facies architecture and dissolution modification resulted in strong heterogeneity within the reservoir,which showed the characteristics of"attic type"architecture.The results of this study can guide the development of similar reservoirs in the Middle East.

关 键 词：伊拉克 哈法亚油田 白垩系 Mishrif组 沉积微相 储集层构型 

分 类 号：TE122.1[石油与天然气工程—油气勘探]