Q uantitative pore evolution model of sandstone reservoirs for Member 3 of Shahejie Formation in the northern subsag of Laizhouwan sag
Wang Tong1,2, Zhu Xiaomin1,2, Zhang Zili1,2, Liu Yu1,2, Guo Cheng3, Li Zhuo3
1. College of Geosciences, China University of Petroleum, Beijing 102249, China;
2. State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China;
3. Tianjin Branch, CNOOC China Limited, Tianjin 300459, China
The Laizhouwan sag, located in the southern part of the Bohai Bay Basin, is small but rich in hydrocarbons, and there is little research on reservoir diagenesis. The analysis results obtained by various technical means such as thin sections, SEM, X-ray diffraction, and cathodoluminescence show that the lithology of the middle-deep reservoirs in Member 3 of Shahejie Formation is mainly medium-fine grained lithic feldspar sandstone in the Laizhouwan sag, with medium-high compositional and textural maturity, good reservoir performance characterized by medium porosity and medium-low permeability, and at the stage A1 of mesodiagenesis. The comprehensive analysis of stratigraphic burial history, thermal evolution history, hydrocarbon generation history of source rocks and diagenetic evolution history indicates that the evolution of the reservoir pore spaces has mainly experienced four stages including mechanical compaction for porosity reduction, early cementation for porosity reduction, acidic dissolution for porosity increase and late cementation for porosity reduction, and the corresponding changes in porosity are 7.73%, 4.61%, 5.99% and 2.54%, respectively. On this basis, a comprehensive model of quantitative evolution of reservoir pores can be established. Affected by the long-term shallow burial environment and the diagenetic evolution stage, the porosity of ancient reservoir of Member 3 of Shahejie Formation in the Laizhouwan sag was ca. 25% in the accumulation period under good hydrocarbon charging conditions. At present, the pore type is still dominated by primary intergranular pores, showing good oil and gas preservation conditions and great exploration potentials. This understanding can provide theoretical support for further exploration and development in the study area.
王彤, 朱筱敏, 张自力, 刘宇, 郭诚, 李卓. 莱州湾凹陷北洼沙河街组三段砂岩储层孔隙定量演化模式[J]. 石油学报, 2020, 41(6): 671-690.
Wang Tong, Zhu Xiaomin, Zhang Zili, Liu Yu, Guo Cheng, Li Zhuo. Q uantitative pore evolution model of sandstone reservoirs for Member 3 of Shahejie Formation in the northern subsag of Laizhouwan sag[J]. Acta Petrolei Sinica, 2020, 41(6): 671-690.
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