文昌油田群珠江组钙质砂岩层发育规律研究

Study on Development Pattern of Zhujiang Formation Calcareous Sandstone in Wenchang Oilfield Group

根据岩心、薄片鉴定、测井和测试等资料对文昌油田群珠江组储层中钙质夹层的特征和成因进行了研究。结果表明,钙质砂岩层主要分布在介壳碎屑富集区、泥岩或砂质泥岩突变接触带。主要有大气成岩、埋藏成岩2种成因类型,其中以埋藏成岩作用为主。钙质砂岩层的发育主要受沉积微相类型、构造幅度、泥砂岩厚度比3个因素的控制。

Based on cores,thin section identification,logging and analytical tests,characteristics and genesis of the calcareous interbeds in Zhujiang Formation of Wenchang oilfield group were investigated. The results show that the calcareous sandstone mainly distributes in the shell clastic enriched areas,or rapid mutation contact zones of mudstone or arenaceous mudstone. There are mainly two genetic types: atmospheric diagenesis and burial diagenesis,in which burial diagenesis dominates. Development of calcareous sandstone is primarily controlled by three factors: types of sedimentary micro-facies,structural amplitude and mudstone /sandstone thickness ratio.