Characteristics of fluid inclusions and determination of gas accumulation period in the Upper Paleozoic reservoirs of Sulige Gas Field

Being the largest gas field ever discovered in China,Sulige Gas Field will become one of the most important main production areas.For the purpose of ascertaining the time of gas charging and the formation period of gas reservoirs in the Upper Paleozoic of Sulige Gas Field,the samples of fluid inclusions from this field were tested and analyzed using the more advanced testing apparatus and techniques.The results show that the fluid inclusions of this area mainly include hydrocarbon-bearing CO2 inclusion,CH4-rich gaseous hydrocarbon inclusion and highly saturated hydrocarbon-rich liquid hydrocarbon inclusion.The homogenization temperature of the fluid conclusion has two special peaks at 90~120℃ and 140~150℃,which shows that there are two main orders and times of gas charging and gas accumulation in the Upper Paleozoic of Sulige Gas Field.The test data of fluid inclusions and the burial history show that two periods from the late stage of Early Jurassic to the late stage of Late Jurassic(190~154Ma bp)and Early Cretaceous(137~96Ma bp)are the main gas accumulation period in the Upper Paleozoic of Sulige Gas Field.