Relationship Between Densification and Hydrocarbon Filling of the Gaotaizi Oil Layer in the Qijia Area

doi:10.11885/j.issn.1674-5086.2018.12.10.01

Abstract

Abstract:

To determine the relationships between the densification and hydrocarbon filling of the Gaotaizi reservoir in the Qijia Area, Songliao Basin, this study employed various methods, such as casting thin sections, scanning electron microscopy, nanoCT, mercury intrusion experiments, fluid inclusion analysis, and the compaction-recovery curve, to examine the microscopic characteristics of the Gaotaizi tight reservoir in detail. And fine description of the formation period of the tight reservoir was made. The findings were integrated with the evolutionary characteristics of reservoir pores to discuss the relationship between the densification processes and hydrocarbon filling in the region. The results indicate that the Gaotaizi tight reservoir in the Qijia Area is dominated by lithic feldspar-bearing sandstones followed by feldspar-bearing lithic sandstones. The reservoir pores are mainly residual intergranular and dissolution pores and they are mostly submicron-nano in size, with good pore and throat connectivity. Reservoir densification occurred in the Lower Mingshui Formation. There are two phases of hydrocarbon filling in the Gaotaizi oil layer in the region. The first occurred during the period 79~75 Ma, corresponding to the formation of the Upper Nenjiang Formation. The second phase occurred during the period 69~65 Ma, when the Lower Mingshui Formation formed. The Gaotaizi reservoir in the Qijia Area, Songliao Basin has undergone multiple formation periods which were accompanied by densification.

Key words: reservoir densification, hydrocarbon filling, reservoir formation period, Gaotaizi oil layer, Qijia Area

CLC Number:

TE112

SI Shanghua, REN Xiang, ZHAO Yutao, WU Weitao, LI Xu. Relationship Between Densification and Hydrocarbon Filling of the Gaotaizi Oil Layer in the Qijia Area[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 56-66.

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