塔里木盆地志留系可容空间变化特征及其与油气成藏的关系

Accommodation change and its relationship to hydrocarbon accumulation in the Silurian,Tarim Basin

受构造运动的影响,塔里木盆地志留系可容空间发生变化,沉积中心随之迁移,地层厚度发生变化。在塔里木盆地志留系南北向、东西向剖面基础上建立了单盆和双盆两种可容空间的变化模式,并根据其不同特征将地层按可容空间分为3个带:可容空间增加带、转换带、减小带。根据南北向和东西向连井剖面及地层的沉积模式,分析不同可容空间变化带的特点,证实了塔里木盆地志留系地层垂向和横向上存在的可容空间变化。从单井油气成藏研究入手,分析可容空间变化带与油气成藏的关系,说明可容空间增加带也存在有利于油气成藏的条件。

Influenced by tectonic movements, the accommodation, the center of sedimentation and the formation thickness changed in the Silurian of Tarim Basin. Two models of the accommodation changes are established based on the north-south and west-east sections, one is the single-basin model; the other is the double-basin model. According to the change of the accommodation, the stratum is divided into increase zone, decrease zone and transitional zone. Based on the north-south and west-east sections and the stratigraphic sedimentary model, the accommodation zones are analyzed and the accommodation changes in vertical and horizontal directions are identified. The relationship of the accommodation change zones and reservoirs is analyzed in terms of the hydrocarbon accumulation of single well, showing the increase zone is also a good zone for the accumulation of oil and gas.