Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (3): 20-26.doi: 10.12108/yxyqc.20190303

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of fluid inclusions and hydrocarbon accumulation stages of Yanchang Formation in Fengfuchuan area,Ordos Basin

TANG Jianyun1,2, ZHANG Gang3, SHI Zheng4, ZHANG Xing2, CHEN Yubao5   

  1. 1. Karamay Vocational and Technical College, Karamay 834000, Xinjiang, China;
    2. China University of Petroleum(Beijing) at Karamay, Karamay 834000, Xinjiang, China;
    3. Dingbian Oil Production Plant, Yanchang Petroleum Co., Ltd., Yulin 719000, Shaanxi, China;
    4. Wuxi Institute of Petroleum Geology, Sinopec Research Institute of Petroleum Exploration and Production, Wuxi 214126, Jiangsu, China;
    5. Yanchang Petroleum Co., Ltd., Yan'an 716005, Shaanxi, China
  • Received:2018-12-17 Revised:2019-02-19 Online:2019-05-21 Published:2019-05-06

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Abstract: In order to determine hydrocarbon accumulation period and characteristics of oil-gas fluid inclusion in Chang 2 and Chang 6 reservoir in Fengfuchuan area of Ordos Basin, fluorescence microscope identification and hot and cold temperature experimental analysis were carried out, and the homogenization temperature of inclusions and burial history and thermal evolution history were applied to determine the oil and gas filling time of the target zone.The results show that:(1) fluid inclusions in the study area mainly consist of saline inclusions and liquid hydrocarbon inclusions; (2) the homogenization temperatures of fluid inclusions in Chang 6 and Chang 2 reservoir are 100-120℃ and 90-110℃, respectively, and the stratum was in diagenetic A stage when fluid inclusions were captured, with salinity less than 10.5‰, which belonged to moderate salinity; (3) both Chang 2 and Chang 6 were filled with oil and gas in the first stage, which was Early cretaceous. The oil and gas filling time of Chang 2 is 115-100 Ma, and that of Chang 6 is 120-105 Ma. The research results confirm that Yanchang Formation in Fengfuchuan area is a continuous filling reservoir.

Key words: fluid inclusion, hydrocarbon accumulation, Yanchang Formation, Fengfuchuan area, Ordos Basin

CLC Number: 

  • TE122.1
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