塔河油田七区碳酸盐岩的成岩特征

Diagenesis characteristics of carbonate reservoir in 7th zone of Tahe Oilfield

为深入探讨碳酸盐岩成岩作用对储层储集性的影响,基于钻录井、岩心、地化等资料,研究塔河油田七区奥陶系碳酸盐岩储层的成岩特征。结果表明:研究区碳酸盐岩成岩作用主要有溶解、溶蚀、压溶、白云石化、破裂、压实、重结晶、胶结等类型,大多以强压实、强溶蚀、弱胶结为特征。结合烃类演化、有机质成熟度、成岩作用类型及成岩环境分析发现,该区碳酸盐岩成岩阶段可划分为准同生期、早成岩期、晚成岩期、后生期和表生期,并推断研究区奥陶系现处于晚成岩期。

This paper is an in-depth research into the effect of carbonate diagenesis on reservoir.The study building on drilling and logging data,core data,and geochemical data looks at the diagenetic characteristics of Ordovician carbonate reservoirs in 7th zone of Tahe Oilfield.The results show that carbonate diagenesis consists mainly of dissolution,pressure solution,dolomitization,recrystallization,cataclasis,compaction,and cementation,characterized by strong compaction,strong dissolution,and weak cementation.The analysis,combined with the evolution of hydrocarbon,the maturity of organic matter,the diagenetic type,and the diagenetic environment finds the presence of the five stages in the diagenesis stage of Ordovician carbonate rock：penecontemporaneous stage,early diagenesis stage,late diagenesis stage,catagenesis stage,and supergene stage,and infers that the diagenesis stage of ordovician carbonate rock in 7th zone of Tahe Oilfield is in late diagenesis stage.