塔里木盆地西克尔中奥陶统礁滩相储层成岩特征与系统划分

通过对塔里木盆地西克尔地区中奥陶统生物礁滩成岩作用方式、成岩演化序列和相对应的地质作用产物、组合及稀土元素和碳、氧、锶稳定同位素地球化学特征综合研究,按"水文体制"将生物礁滩地层划分为不同成岩阶段的近地表海水-海源地层水、大气淡水、温压水和油田卤水4个成岩系统。各成岩系统流体来源、性质、水-岩石相互作用过程及其对储层的影响各不相同,其中与储层发育密切相关的成岩体系和成岩方式主要为:古表生期大气水成岩系统的岩溶作用、再埋藏成岩阶段温压水成岩系统和油田卤水成岩系统的深部溶蚀和各期构造破裂作用。

Diagenetic characteristics and system of Xekar Middle Ordovician organic reef-beach facies reservoirs in Tarim basin

The diagenetic manner and evolution stage as well as the corresponding geological products and geochemical characteristics of REE,carbon,oxygen and strontium stable isotopes of Xekar Middle Ordovician Organic Reef-beach facies reservoirs were comprehensively studied in this paper.According to the "hydrological system",the Middle Ordovician organic reef-beach facies strata were divided into four diagenetic systems,i.e.,pore water,atmosphere water,temperature-pressure water and oilfield brines.The source and property of fluid flow and the interaction process between fluid and rock of each diagenetic system were different from each other,and their effects on the reservoir development were varied.Therefore,the diagenetic systems and manners closely related to the reservoir development mainly include the role of the karstification of atmospheric water at the ancient epigenetic stage,the role of temperature-pressure water and oilfield brines at the re-burial diagenetic stage,and the role of tectonic disruption at the middle-late re-burial diagenetic stage.