鄂尔多斯盆地南部延长组长8油藏油气充注期次

doi:10.12108/yxyqc.20190403

Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 21-31.doi: 10.12108/yxyqc.20190403

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Hydrocarbon charging time of Chang 8 reservoir of Yanchang Formation in southern Ordos Basin

DING Chao¹, GUO Shun², GUO Lan³, GUO Xiaobo¹, DU Guichao¹, WU Hongshuai¹

1. School of Earth Sciences & Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2. Department of Resource Exploration and Development, Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China;
3. Yanchang Oil Field Co., Ltd., Yan'an 716000, Shaanxi, China

Received:2018-12-19 Revised:2019-04-28 Online:2019-07-21 Published:2019-06-21

Abstract

Abstract: In order to determine hydrocarbon charging time of Chang 8 reservoir of Yanchang Formation in southern Ordos Basin,the diagenetic evolution sequence of sand reservoir and homogenization temperature of fluid inclusion(FI)analysis were carried out. The results show that:(1)the Chang 8 reservoir show three stages of geochronology of hydrocarbon charging,the first stage of hydrocarbon FI that show brine inclusions are mainly hosted early fracture and dissolution area of quartz,and the homogenization temperature of associated brine inclusions is in the range from 61.1℃ to 121.7℃. The second stage of hydrocarbon FI that show brine inclusions are mainly hosted quartz overgrowths and calcite cement,and the homogenization temperature of associated brine inclusions is in the range from 106.2℃ to 155.7℃. The third stage of hydrocarbon FI that show brine inclusions are mainly hosted late fractures cutting through quartz and its overgrowths,and the homogenization temperature of associated brine inclusions is in the range from 92.2℃ to 130.5℃.(2)Combining with the tectonic thermal evolution history of the study area,it can be concluded that the first hydrocarbon charging stage is early oil-gas accumulation processes from Early Jurassic to Late Jurassic(192.5-152.0 Ma),the second stage is key processes of hydrocarbon occurred from Late Jurassic to Early Cretaceous(152.0-126.0 Ma),and the third stage is processes of adjustment and accumulation of hydrocarbon occurred in Paleogene(60.0-36.5 Ma). The study results is of great significance to secondary hydrocarbon reservoir exploration in southern Ordos Basin.

Key words: fluid inclusion, homogenization temperature, hydrocarbon charging, Yanchang Formation, Triassic, southern Ordos Basin

CLC Number:

TE122.1

DING Chao, GUO Shun, GUO Lan, GUO Xiaobo, DU Guichao, WU Hongshuai. Hydrocarbon charging time of Chang 8 reservoir of Yanchang Formation in southern Ordos Basin[J].Lithologic Reservoirs, 2019, 31(4): 21-31.

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Hydrocarbon charging time of Chang 8 reservoir of Yanchang Formation in southern Ordos Basin

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