摘要
针对白云岩成因、原生白云石沉淀、白云岩孔隙成因等问题,在前人认识的基础上,补充四川和塔里木盆地典型案例的岩石学和地球化学特征分析工作,取得3项进展:(1)提出基于岩石特征、形成环境和时间序列的白云岩成因分类,不同成因白云岩之间的成岩域、特征域界线清晰,演化线索清楚,更具系统性和连续性;(2)建立不同成因白云岩的岩石学和地球化学特征识别标志,白云岩之间的岩石学和地球化学特征的变化具有规律性,是连续时间序列上形成环境变迁的响应;(3)重新评价白云石化作用对孔隙的贡献,阐明白云岩中的孔隙主要来自原岩的沉积原生孔、部分来自表生溶蚀和埋藏溶蚀作用,早期白云石化有利于孔隙的保存。这些认识对白云岩成因的理解、不同成因白云岩的判识具重要的理论意义,同时对白云岩储集层预测具有重要的指导意义。
To find out the origin of dolomite,the precipitation of primary dolomite,and the formation of pores in dolomite,petrologic and geochemical characteristics of typical samples from Sichuan and Tarim Basin were analyzed based on the previous understandings,and three aspects of results were achieved.(1)A classification of dolomite origins based on petrologic features,forming environment and time sequence was proposed,which shows clear boundaries of diagenetic and characteristic realms and evolved clues between different types of dolomite.(2)Petrographic and geochemical identification marks for different types of dolomite were presented,revealing that the orderly geochemical variation of different types of dolomite is the response to the change of forming environment of dolomite during continuous time sequence.(3)The contribution of dolomitization to the formation of porosity was re-evaluated,revealing that the porosity in dolomite was mostly attributed to the primary pores and supergene dissolution and burial dissolution,and early dolomitization was conducive to the preservation of primary pores.These understandings are of great theoretical significance for identifying the origins and types of dolomite,and can guide the prediction of dolomite reservoirs.
作者
赵文智
沈安江
乔占峰
潘立银
胡安平
张杰
ZHAO Wenzhi;SHEN Anjiang;QIAO Zhanfeng;PAN Liyin;HU Anping;ZHANG Jie(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;Hangzhou Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China;Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou 310023,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2018年第6期923-935,共13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)。
作者简介
赵文智(1958-),男,河北昌黎人,博士,中国石油勘探开发研究院教授级高级工程师,中国工程院院士,主要从事石油天然气地质综合研究和科研管理工作。地址:北京市海淀区学院路20号,中国石油勘探开发研究院,邮政编码:100083。E-mail:zwz@petrochina.com.cn。
