湖北随州上震旦统灯影组白云岩成岩作用及储层特征

Reservoir and Diagenesis Characteristics of DengyingFormation(Upper Sinian) in Suizhou, Hubei

湖北随州上震旦统灯影组为一套由深变浅的碳酸盐岩沉积序列。在薄片观察的基础上，利用碳、氧同位素、微量元素和包裹体古盐度分析等资料，详细研究了该区白云岩主要成岩作用类型，如白云石化作用、胶结作用、压实压溶作用等。研究表明，该区局限台地相白云岩主要由毛细管浓缩白云石化作用形成；台地边缘浅滩相白云岩由混合水白云石化作用形成；深水斜坡盆地边缘相白云岩由浅水相区高盐度卤水沿斜坡向下流动过程交代灰泥而形成。最后对该区储集空间类型和储层类型进行了分析和评价。

The Dengying formation of upper Sinian in Suizhou,Hubei,China is dominated by carbonate rocks.Based on the observation made on a large number of sections,and analysis of carbon and oxygen isotopes,trace elements and inclusions,the carbonate diagenesis is studied in datail.There are three main diagenesis processes in the interval in Suizhou,they are dolomitization,cementation,and compaction and pressure solution.The dolomite rocks in restricted platform facies were formed by capillary action dolomitization,ones in shoal formed by meteoricmarine mixing dolomitization as well as ones in deep slope and basin margin facies formed by replacement of lime mud with high salinity water. Furthermore, an evaluation of reservoir has been made.