文昌A凹陷珠海组低渗砂岩成岩特征与孔隙演化

徐燕红; 杨香华; 梅廉夫; 王萌; 王宁

doi:10.3799/dqkx.2020.055

Volume 45 Issue 6

Jun. 2020

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Article Navigation > Earth Science > 2020 > 45(6): 2172-2185

Xu Yanhong, Yang Xianghua, Mei Lianfu, Wang Meng, Wang Ning, 2020. Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation, Wenchang A Sag. Earth Science, 45(6): 2172-2185. doi: 10.3799/dqkx.2020.055

Citation:

Xu Yanhong, Yang Xianghua, Mei Lianfu, Wang Meng, Wang Ning, 2020. Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation, Wenchang A Sag. Earth Science, 45(6): 2172-2185. doi: 10.3799/dqkx.2020.055

Citation:

Xu Yanhong, Yang Xianghua, Mei Lianfu, Wang Meng, Wang Ning, 2020. Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation, Wenchang A Sag. Earth Science, 45(6): 2172-2185. doi: 10.3799/dqkx.2020.055

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Diagenetic Characteristics and Porosity Evolution of Low Permeability Sandstone Reservoir in Zhuhai Formation, Wenchang A Sag

doi: 10.3799/dqkx.2020.055

Xu Yanhong^{1, 2
,
,},
Yang Xianghua^{1, 2
,
,},
Mei Lianfu^{1, 2},
Wang Meng^{1, 2},
Wang Ning^{1, 2}

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2019-08-11
Publish Date: 2020-06-15

Abstract

Abstract

Petrology and diagenesis of low permeability sandstone reservoirs in Zhuhai Formation were studied by means of thin sections identification, scanning electron microscopy (SEM), physical property, X-ray diffraction (XRD) analysis and carbon and oxygen isotope. The research of Wenchang A sag, Zhuhai Group of low permeability sandstone reservoir petrology characteristics and characteristics of diagenesis and the quantitative analysis was carried out on the rock strength, compaction, cementation, dissolution, the impact on the reservoir pore evolution. Quantitative analysis of diagenetic strength was carried out to evaluate the effects of compaction, cementation and dissolution on reservoir pore evolution. The results show as follows. (1) The Zhu-3 south fault zone is mainly composed of lithic sandstone and feldspar lithic sandstone with high content of medium and coarse sandstone. However the 6th fault zone is mainly feldspar lithic sandstone and lithic quartz sandstone with high fine sandstone content. The storage space is dominated by secondary dissolution pores, and the physical properties change greatly and show obvious zonation in both longitudinal and plane. (2) Mechanical compaction caused a large number of loss of primary intergranular pores in Zhuhai Formation. Iron-bearing carbonate, authigenic illite and siliceous cement further reduced the intergranular pores, while early chlorite inhibited quartz overgrowth. The dissolution improves the physical properties of deep reservoirs and two secondary dissolution zones developed in the Zhuhai Formation. According to the diagenetic facies prediction, the subaqueous distributary channel with thick layers, coarse-grained sandstones is a high-quality reservoir development zone in the study area.(3) Through quantitative analysis of porosity evolution, it is concluded that diagenesis has different effects on the porosity evolution of coarse and fine-medium grained sandstones.
- low permeability sandstone,
- diagenesis,
- diagenetic facies,
- porosity evolution,
- petroleum geology

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References(41)

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