In this paper, the characteristics of fluid inclusions in the reservoir of Yingcheng formation in Dehui Fault Depression of Songliao Basin are studied in depth by means of single polarized light, fluorescence microscope, laser Raman spectrum analysis and micro-cold and hot table temperature measurement observation, and the main stages and formation and evolution processes of oil and gas accumulation in the region are revealed. The results show that the reservoir inclusions in the Yingcheng formation of the Dehui Fault are mainly distributed in the quartz particle microfissures and pore-filling calcite minerals, and the gas composition is mainly alkane gas. In addition, there are many fluid inclusions in the reservoir. The hydrocarbon accumulation time of Yingcheng formation in Deshen 63 Well in Baojia Depression is early, and the first stage is early Quantou formation (100 ~ 94Ma). The second stage is late Nenjiang Formation (80 ~ 72Ma); The hydrocarbon accumulation time of Yingcheng formation in Deshen 36 Well in Nong’annan Sag is late, and the first stage is late Qingshankou formation-early Nenjiang Formation (92~82Ma); the second stage is the late Nenjiang formation (76 ~ 72Ma); the overall presents the “north early south late” reservoir formation characteristics, further confirmed that the region has a multi-period oil and gas accumulation evolution history. This study is of great theoretical and practical significance for in-depth understanding of the mechanism of oil and gas accumulation in this area and optimizing the exploration and development plan.

Wang Han. Characteristics of Fluid Inclusions and Hydrocarbon Accumulation Stages of Yingcheng Formation in Dehui Fault Depression. Academic Journal of Environment & Earth Science (2024), Vol. 6, Issue 1: 75-83. https://doi.org/10.25236/AJEE.2024.060111.

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