Characteristics and main controlling factors of Lower Triassic Feixianguan Formation carbonate reservoir in Puguang gas field

doi:10.3969/j.issn.1672-7703.2017.06.005

Abstract

Abstract: In order to realize the exploration and development aim of "high efficiency with fewer wells" in Puguang gas field, it is of great significance to search for the good-quality reservoir development zones. In Puguang gas field, the platform margin shoal-platform front ramp of Feixianguan Formation marine carbonates are characterized by shallow sedimentary water and strong evaporation. In this environment, the reservoir combination of oolitic dolomite in T₁f₁₊₂ platform margin shoal and muddy-micritic dolomite in T₁f₃ evaporative platform lagoon is developed, and the reservoir space is mainly in the form of secondary pores and less fractures and vugs. The T₁f₁₊₂ oolitic dolomite is characterized advantageously by large pore, medium-coarse throat, moderate-high porosity and high permeability, but the T₁f₃ muddymicritic dolomite presents the characteristics of poor reservoirs, e.g. micro pore, tiny throat, low porosity and low permeability. It is indicated that the quality of reservoir development is mainly controlled by the joint effect of sedimentation, diagenesis and tectogenesis. Among them, sedimentation is the foundation, thus the platform margin shoal is the most favorable reservoir facies. Diagenesis is the key effect, and a large amount of secondary solution pores are formed due to the dolomitization and the stacked dissolution of two periods of hydrocarbon generation, thus the physical properties of the reservoirs are improved greatly. The formation and evolution of source rocks reservoirs are controlled by the early tectonic uplift, the dominant oil and gas migration pathways are dominated by the late NE-striking fault system, and the seepage channels are acted by fractures and faults. Consequently, potential good-quality reservoir development areas are formed.

Key words: Puguang gas field, Feixianguan Formation, carbonate gas reservoir, reservoir characteristics, main controlling factor

CLC Number:

TE112.2

Liu Ran, Huo Fei, Wang Xin, Yang Tao, Li Xiwei, Chen Ketong. Characteristics and main controlling factors of Lower Triassic Feixianguan Formation carbonate reservoir in Puguang gas field[J]. China Petroleum Exploration, 2017, 22(6): 34-46.

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