Eastern Section Meeting

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Fluid Inclusions Characteristics and Hydrocarbon Accumulation Period Analysis of the Lixian Slope Northern Section Reservoir (the Bohai Gulf Basin in China)

Abstract

Objectives: Lixian Slope at the west of Raoyang depression is an inheritance, extensive, wide and gradual depositional slope developed in ancient uplift of anterior Paleogene. A large amount of hydrocarbon inclusions and salt-water inclusions has been discovered in reservoir of Shahejie formation. This study aims at analyzing the fluid inclusions characteristics and hydrocarbon accumulation period of the Lixian slope northern section reservoir (the Bohai Gulf basin in China), providing the basis for the analysis of the hydrocarbon accumulation process, the analysis of hydrocarbon distribution and petroleum exploration.

Procedures: An in-house fluid inclusions analysis system was used to analyze the reservoir sandstone samples from the slope. The resultant data was further applied to draw homogenization temperature - fine burial history projection. The projection was used to analyze hydrocarbon accumulation times and historical period of each accumulation in the research area.

Results: Sub-segmental of the No. 1 group of Shahejie formation at the Lixian slope northern segment has two periods hydrocarbon filling in geological history: the homogenization temperatures of the fluid inclusions with yellow-green fluorescence were 80–90°C, and the corresponding buried time was 7.5–5.5Ma; the homogenization temperatures of fluid inclusions with blue-green fluorescence were 105–115°C, and the corresponding buried time was 2–0Ma.

Conclusions: Fluid inclusions characteristics and hydrocarbon accumulation period of the Lixian slope northern section reservoir was analyzed. This study provided the basis for the analysis of the hydrocarbon accumulation process, the analysis of hydrocarbon distribution and petroleum exploration of the area.