摘要
塔里木盆地北部震旦系至奥陶系白云岩是油气的主要储集岩类之一。震旦系白云岩中的各种颗粒、微晶基质、纤状胶结物及柱纤伏胶结物是准同生白云石化的产物,前三者为海水白云石化的结果,后者为大气淡水或混合水白云石化的结果;细粒及粗粒状胶结物分别为大气淡水或混合水、埋藏环境中直接沉淀的白云石。寒武系至奥陶系的微晶白云岩、藻纹层白云岩及颗粒白云岩中的颗粒是准同生期海水潜流环境白云石化的产物;细至粗晶白云岩及颗粒白云岩及颗粒白云岩中的粗粒白云石胶结物是深埋藏成岩环境的产物。其间尚有许多过渡类型。
The Sinian-Ordovician dolomites are one of the main reservoir rocks in northern TarimBasin. Detailed petrographic and geochemical studies show that in the Sinian dolomites va-rious grains, micritic matrix, fibrous and fibrous-prismatic cements are products of penecon-temporary dolomitization, the former three resulted from sea-water dolomitization while thelatter is the result of meteoric or mixed water dolomitization. Fine- to coarse-grained cemen-ts are dolomites precipitated respectively from meteoric or mixed waters and in burial envi-ronments. In the Cambrian-Ordovician, micritic dolomite, algal-laminated dolomite andgrains in gradular dolomite resulted from dolomitization in the marine phreatic environment inthe penecontemporary period; fine to coarse crystalline dolomite and coarse-grained dolomite cements in the gradular dolomite were derived from dolomitization in the deeply-burial diageneticenvironment. In addition there are some intermediate types.
出处
《地球化学》
CAS
CSCD
北大核心
1993年第1期1-9,共9页
Geochimica
基金
国家"七五"重点科技攻关课题
