Influence of Alkaline Environment Diagenetic Evolution on Reservoir Performance in the Second Member of Shahejie Formation of Qibei Slope

doi:10.3969/j.issn.1006-6535.2023.03.005

Abstract

Abstract: In order to deepen the understanding of the diagenetic environment, evolution mode and pore development mechanism of the reservoir in the Second Member of Shahejie Formation of Qibei Slope, the characteristics of alkaline environmental diagenesis, diagenetic evolution mode, alkaline environmental genesis mechanism and its influence on pore development of the dense sandstone reservoir in the Second Member of Shahejie Formation were studied by means of rock (cast) thin section, scanning electron microscopy and X-ray diffraction analysis. The results show that there are various alkaline environment diagenesis phenomena in the reservoir, such as quartz dissolution, multi-phase carbonate mineral cementation and metasomatism, anhydrite metasomatism and alkaline clay mineral assemblage; the current reservoir diagenctic stage is in the mesogenetic A₂ sub-stage, and the diagenetic environment has experienced alkaline-acidic-alkaline changes during the whole diagenetic evolution; in the early diagenetic stage, the formation of the alkaline diagenetic environment was closely related to the saltwater lake basin environment in the same sedimentary stage. In the mesogenetic A₂ sub-stage, due to the enrichment of metal cations, the acidic water source was reduced and heavily depleted, resulting in the increase of the pH value of the pore water medium and a return to the alkaline diagenetic environment; the multi-phase carbonate cement formed in the alkaline environment filled the pores in large quantities, which significantly reduces the reservoir space, and at the same time, the early alkaline fluid medium in the reservoir also suppressed the dissolution modification intensity of the acidic fluid to the reservoir, but the quartz dissolution in the alkaline environment formed a large number of secondary pores, which is the main mechanism of pore development in the reservoir within the study area. The research results are of guiding significance for predicting the distribution of high-quality reservoirs in the study area.

Key words: reservoir pore, diagenetic evolution, quartz dissolution, alkaline environment, reservoir performance, Qibei slope

CLC Number:

TE122

Liu Jinku, Deng Mingjie, Zhang Ze, Li Guoliang, Fang Jinwei, Wang Chunpu, Wang Feiyang, Tan Quan. Influence of Alkaline Environment Diagenetic Evolution on Reservoir Performance in the Second Member of Shahejie Formation of Qibei Slope[J]. Special Oil & Gas Reservoirs, 2023, 30(3): 38-46.

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