Relationship Between Reservoir Densification and Hydrocarbon Charging: A Case Study of Cretaceous Fuyu Reservoir of the Sanzhao Sag

doi:10.19657/j.geoscience.1000-8527.2021.195

Abstract

Abstract:

To clarify the correlation between reservoir densification and hydrocarbon charging in the Fuyu reservoir of the Sanzhao sag (Songliao Basin), the micro-pore/-throat characteristics of the reservoir were studied with micro-CT, fluid inclusion micro-analysis and basin simulation, and the accumulation period was quantitatively analyzed. According to the reservoir pore evolution, the relation between reservoir densification and hydrocarbon accumulation is analyzed. The results show that the Fuyu tight reservoir in Sanzhao sag contains mainly feldspathic lithic sandstone and lithic arkose, and the pore throat is featured by narrow throat, wide pore, poor configuration, and large total volume. Compaction and cementation are important for reservoir densification, and the compaction likely occurred before the end of Nenjiang Formation deposition. Fluid inclusion analysis results show that oil charging in the Fuyu reservoir can be divided into an early and late stage, with corresponding charging time of 77 to 74 Ma and 67 to 65 Ma, respectively, corresponding to the sedimentary period of Nenjiang Formation and the end of Mingshui Formation. Comprehensive comparison of hydrocarbon accumulation history and reservoir pore evolution characteristics of the Fuyu oil layer suggest that after reservoir densification occurred during the oil charging, the reservoir was first compacted and then generated.

Key words: reservoir densification, hydrocarbon accumulation, formation period, Fuyu reservoir, Sanzhao sag

CLC Number:

TE122.1

SI Shanghua, HU Zhangming, LIU Ji, LIU Yunfei, ER Chuang, YANG Zheheng, HE Junhao. Relationship Between Reservoir Densification and Hydrocarbon Charging: A Case Study of Cretaceous Fuyu Reservoir of the Sanzhao Sag[J]. Geoscience, 2021, 35(06): 1854-1863.

Figures/Tables 12

Fig.1 Structural location and distribution of fluid inclusion sampling wells in the Sanzhao sag

Fig.2 General Mesozoic stratigraphy of the Sanzhao sag

Fig.3 Ternary tight sandstone classification diagram of the Fuyu reservoir, Sanzhao sag

Fig.4 Grain contact relationship of tight sandstone in the Fuyu reservoir, Sanzhao sag

Fig.5 Correlation between average pore diameter and physical properties of tight sandstone in the Fuyu reservoir, Sanzhao sag

Fig.6 Micro (red)-and nano (blue)-pore distribution of Fuyu reservoir in the Sanzhao sag (CT scan image)

Fig.7 Intergranular pore types of clay minerals in Fuyu reservoir of the Sanzhao sag (SEM)

Fig.8 Oil inclusions with different fluorescence colors and the fluorescence spectral characteristics in the Fuyu reservoir, Sanzhao sag

Fig.9 Homogenization temperature histogram of oil inclusion and coeval brine inclusion in the Fuyu reservoir, Sanzhao sag

Fig.10 Diagram of hydrocarbon charging age by single-well burial history and homogenization temperature projection in the Sanzhao sag

Fig.11 Diagenetic types of Fuyu reservoir in the Sanzhao sag

Fig.12 Comprehensive models of burial history (a) pore evolution and diagenetic sequence (b) of the Fuyu reservoir, Sanzhao sag

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