准噶尔盆地白家海凸起三工河组储层流体包裹体特征与成藏时间

Hydrocarbon Accumulation Orders and Periods by Fluid Inclusion Characteristics in Sandstone Reservoir of Sangonghe Formation of Baijiahai Swell,Junggar Basin

通过显微偏光．荧光观察和显微测温，对准噶尔盆地自家海凸起三工河组砂岩储集层流体包裹体特征进行了研究；并结合储层埋藏史确定了研究区三工河组油气成藏时间，以便进一步揭示白家海地区油气成藏规律。结果表明：三工河组砂岩储集层发育2期包裹体，第一期主要发育于石英颗粒微裂纹与石英颗粒次生加大边的成岩早期微裂纹中，第二期主要发育于切穿石英颗粒的成岩后期微裂纹及穿石英颗粒加大边中。流体包裹体均一温度系统分析表明，三工河组砂岩储集层发生过2期流体活动，均与油气成藏有关。结合地层沉积埋藏史-热史分析认为，油气成藏分别发生在距今100～91Ma的早白垩世中期-早白垩世中末期和63～30Ma的古新世早期-渐新世中期。

According to the observation of microscopic polarization-fluorescence colors and the measurement of homogenization temperatures, the fluid inclusion characteristics of sandstone reservoir of Sangonghe Formation are studied. In combination with the burial history, hydrocarbon accumulation orders and periods are obtained. The re- suits indicate that two different phases of inclusions have been identified. The first phase of inclusions locates in the microfissures and overgrowth area of quartz. The second phase of inclusions locates in the microfissures of the late diagenetic stages which cut across quartz and overgrowth area. By system analyses of homogenization temperatures of fluid inclusions, there have happened two times of thermal fluid flow in sandstone reservoir of Sangonghe Forma- tion, all of which are relative to hydrocarbon accumulation. Integrating the burial history and geothermal evolution, the hydrocarbon accumulation respectively correspond to the 100 -91 Ma （ the middle of the Early Cretaceous peri- od to the middle-late of the Early Cretaceous period ） and 63 - 30 Ma （ the early paleocene period to the middle Oligocene period ）.