Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (6): 21-28.doi: 10.12108/yxyqc.20210603

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Hydrocarbon accumulation phases of Yanchang Formation in Wuqi area, Yishan slope

LI Bo1, CUI Junping1,2, LI Ying3, LI Jinsen4, ZHAO Jin5, CHEN Yanwu1   

  1. 1. Department of Geology, Northwest University, Xi'an 710069, China;
    2. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
    3. No.6 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710000, China;
    4. No.1 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710069, China;
    5. No.3 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan 750003, China
  • Received:2021-03-22 Revised:2021-06-01 Online:2021-12-01 Published:2021-11-25

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Abstract: Yishan slope is an important oil and gas producing area in Ordos Basin. The study of hydrocarbon accumulation phases is helpful to judge the accumulation process and distribution of Triassic reservoirs. To clarify the hydrocarbon accumulation phases of Chang 4+5 and Chang 6 reservoirs of Triassic Yanchang Formation, a systematic analysis of reservoir fluid inclusion characteristics was carried out based on homogenization temperature and authigenic mineral(illite) K-Ar isotopic dating of the inclusions-burial history indirect projection dating method. The results show that: (1) The Chang 4+5 and Chang 6 reservoirs of Triassic Yanchang Formation in Wuqi area of Yishan slope are mainly composed of brine inclusions and liquid hydrocarbon inclusions, and the shape is mainly ellipsoid-spheroid. (2) Homogenization temperature analysis shows that the reservoir inclusions can be divided into two phases: the main homogenization temperature peaks of the brine inclusions in the first and second phases are 90-110 ℃ and 120-140 ℃ respectively. (3) Based on the analyses of salinity and composition of the inclusions, thermal evolution history of the basin and K-Ar isotopic dating of reservoir illite, there are two stages of hydrocarbon charging in Chang 4+5 and Chang 6 reservoirs: the first stage is the middle Early Cretaceous(130-115 Ma); the second stage is the late Early Cretaceous(108-96 Ma). The two stages of hydrocarbon charging indicate that the hydrocarbon accumulation phase of Yanchang Formation in Yishan slope is Early Cretaceous(130-96 Ma). This understanding provides a basis for the exploration and development of Triassic oil and gas in Wuqi and its adjacent areas.

Key words: fluid inclusion, homogenization temperature, hydrocarbon accumulation phases, Triassic, Yishan slope, Ordos Basin

CLC Number: 

  • TE121.3
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