库车依南2井包裹体形成的古温度古压力

The Paleotemperature and Paleopressure Forming Inclusions in Yinan No.2 Well, Kuqa Depression

塔里木库车坳陷依南2井侏罗系储集层砂岩中流体包裹体较丰富,主要发育有石油包裹体,盐水溶液包裹体及气态烃包裹体。石油包裹体均一温度为85-110℃,盐水溶液包裹体均一温度为90～120℃与128-168℃,分别与石油包裹体及气态烃包裹体共生。模拟计算出典型石油包裹体与气态烃包裹体的捕获温度与捕获压力分别为115℃,35.9MPa及162℃,54.8MPa.结合成藏地质背景,推测石油包裹体形成时间为12×106-10×106a,气态烃包裹体形成时间为7×106-6×106a,石油包裹体来源干阳霞凹陷侏罗系煤系烃源岩,气态烃包裹体源于依南2井区侏罗系煤系烃源岩。

Abundant fluid inclusions are found in Jurassic sandstone reservoir of Yinan No.2 Well in Kuqa depression, Tarim basin, in which oil inclusion, brine inclusion and gaseous hydrocarbon inclusion are mainly developed, with their uniform temperature of 85-110℃, 90-120℃ and 128-168℃. The typical oil inclusion and gaseous hydrocarbon inclusion possess their own trapped temperature and pressure of 115℃, 35.9MPa and 162℃, 54.8MPa, respectively by modeling 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 Jurassic coal measure source rocks in Yinan No.2 Well Block.