苏里格气田砂岩流体包裹体特征及成藏史

FEATURES OF FLUID INCLUSIONS IN SANDSTONES AND RESERVOIRING HISTORY OF SULIGE GAS FIELD

苏里格气田上古生界砂岩中,发育了丰富的流体包裹体。因此,可以利用流体包裹体的特征及其均一温度特征来定量研究该气田的油气成藏期次。研究结果表明:苏里格气田发育两期流体包裹体,均发育在石英加大边或(和)愈合缝之中;上石盒子组和山西组的包裹体均一温度分布都有两个主峰温度区间;结合地质背景确定了苏里格气田上石盒子组天然气第一期和第二期成藏时间分别为中—晚侏罗世、早白垩世末期;山西组第一期和第二期成藏时间则分别发生在晚侏罗世—早白垩世和中白垩世。

Numerous fluid inclusions are developed in the Upper Paleozoic sandstones in Sulige gas field and their features and homogenization temperatures can be used to quantitatively study the stages of hydrocarbon reservoiring in this gas field. The study results show that fluid inclusions of two stages are developed and they all occur on the secondary outgrowth edges and/or in the healed lines of quartz. The distributions homogenization temperatures of fluid inclusions in both the Upper Shihezi and Shanxi formations show two main peaks. In combination with the geologic settings, the first and the second stages of gas reservoiring in the Upper Shihezi Formation are determined to be in the Middle-to-Late Jurassic and the late of Early Cretaceous respectively, while that in the Shanxi Formation are determined to be in the Late Jurassic-Early Cretaceous and Middle Cretaceous respectively.