Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (4): 141-149.doi: 10.12108/yxyqc.20220413

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Water-rock interaction in deep strata under high temperature and high pressure in Pearl River Mouth Basin

LI Chengze1,2,3, CHEN Guojun1,2,3, TIAN Bing4, YUAN Xiaoyu5, SUN Rui6, SU Long1,2   

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. Key Laboratory of Petroleum Resources Research, Gansu Province, Lanzhou 730000, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Inner Mongolia University of Science and Technology, Baotou 014000, China;
    5. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    6. Research Institute of CNOOC, Beijing 100028, China
  • Received:2021-08-24 Revised:2022-03-30 Online:2022-07-01 Published:2022-07-07

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Abstract: Acidic fluid is the main medium of material migration and energy exchange in petroliferous basins and an important material basis for forming secondary pores and improving reservoir physical properties. Through high temperature and high pressure water-rock reaction experiment on the core samples from the Pearl River Mouth Basin, combined with the analysis and test methods of scanning electron microscope,cast thin section, reservoir physical properties,XRD and ICP-OES,the dissolution of deep clastic reservoirs and the development mechanism of secondary pores were revealed. The results show that:(1)Organic acid fluid has the effect of dissolution on rocks minerals Under high temperature and high pressure, and ion migration occurs, releasing cations such as K+,Ca2+,Na+ and Mg2+. After the reaction, the porosity of the samples was increased by 5.6% on average,and the increase was 31.5%. The content of soluble components in rocks and the primary structure of soluble minerals can affect the development of secondary pores.(2)Using representative core samples to conduct experiments of deep water-rock reaction is an effective way for reservoir evaluation in areas with less well or without well. Under the current tendency of high cost and risk for oil and gas exploration,it is a meaningful way to predict and explore resources in deep reservoir. The experiment can simulate the dissolution process and characterize the dissolution mechanism. Nowadays, under the background of high cost and high risk of deep oil and gas exploration,the experiment results have important reference value for deep reservoir prediction and exploration target optimization.

Key words: water-rock interaction, clastic reservoirs, organic acid fluid, dissolution, high temperature and high pressure, deep reservoir, Pearl River Mouth Basin

CLC Number: 

  • TE122.2
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