Abstract: Abundant fluid inclusions are found in Jurassic sandstone reservoir of Yinan No.2 W ell in Kuqa depression, Tarim basin, in which oil inclusion, brine inclusion and gaseous hydrocarbon inclusion are mainly developed, with their nniform temperature of 85~110℃, 90~ 120℃ and 128~168℃. The typical oil inclusion and gaseous hydrocarbon inclusion possess their own trapped temperatare and pressure of 115℃, 35.9MPa and 162℃, 54.8MPa, respectively by mnodeling estimation. Considering geologic setting of the reservoir, the time of shaping the inclusions is (12~ 10)×10⁶a for oil inclusion and (7~6)×10⁶a for gaseous inclusion, and the former came from Jurassic coal measure source rocks in Yangxia sag, while the latter from Jnrassic coal measure source rocks in Yinan No.2 W ell Block.

Key words: Tarim basin, Kuqa depression, inclusion, paleotemperature, paleopressure