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应用储集层流体包裹体精细描述了鄂尔多斯盆地东部二叠系(太原组、山西组、石盒子组及石千峰组)气藏的成藏时间和成藏过程。研究表明,二叠系储集层流体包裹体类型丰富,主要包括盐水包裹体、含烃包裹体和气态烃包裹体。不同含气层系流体包裹体均一温度分布差异较大,呈单段式、双段式或多段式,成藏期古流体具有高矿化度性质。结合盆地埋藏史和热史分析确定出太原组、山西组、下石盒子组及上石盒子组-石千峰组含气层系的有效成藏时间。研究区二叠系气藏群成藏过程可以分为两个阶段:早期持续埋深阶段(侏罗纪-早白垩世),太原组和山西组原生气藏形成,下石盒子组“泛气藏”形成;晚期抬升调整阶段(晚白垩世),天然气呈束状流快速调整,微裂缝和断裂起沟通作用,下石盒子组气藏和上石盒子组-石千峰组次生气藏形成。
The fluid inclusions of reservoirs are used to elaborate the hydrocarbon accumulation time and accumulation process of the Permian (Taiyuan, Shanxi, Shihezi and Shiqianfeng formations) reservoirs in the eastern Ordos Basin. The study shows that the fluid inclusions in the Permian reservoirs are abundant, including salt inclusions, hydrocarbon inclusions and gaseous hydrocarbon inclusions. The homogenization temperature distributions of fluid inclusions in different gas-bearing strata differ widely, which are single-stage, double-stage or multi-stage, and the paleo-fluid during the reservoir formation has the characteristics of high salinity. Combined with the burial history and thermal history analysis of the basin, the effective accumulation time of the gas reservoirs in the Taiyuan Formation, Shanxi Formation, Xiashihezi Formation and the Upper Shihezi Formation - Shiqianfeng Formation is determined. The process of gas accumulation in the Permian gas reservoirs in the study area can be divided into two stages: the early continuous burial depth (Jurassic-Early Cretaceous), the formation of primary gas reservoirs in Taiyuan and Shanxi formations, Gas reservoirs ". In the later stage of uplift adjustment (Late Cretaceous), the natural gas was rapidly adjusted in a beam-like stream and the microfractures and fractures played the role of communication. The Lower Shihezi Formation gas reservoirs and the Upper Shihezi Formation Shiqifeng Formation secondary gas reservoirs formed .