Journal of Southwest Petroleum University(Science & Technology Edition) ›› 2021, Vol. 43 ›› Issue (2): 23-35.DOI: 10.11885/j.issn.1674-5086.2019.12.18.01

• GEOLOGY EXPLORATION • Previous Articles     Next Articles

Fine Characterization of Reef Limestone Reservoirs in Pearl River Mouth Basin, South China Sea

XIE Ribin1,2, LI Haitao1, YANG Yong2, LIU Yuanzhi2, QU Changwei3   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. CNOOC China Limited, Shenzhen Branch, Nanshan, Shenzhen 518000, China;
    3. Schlumberger China, Chaoyang, Beijing 100015, China
  • Received:2019-12-18 Online:2021-04-10 Published:2021-04-23

Abstract: The reef limestone reservoir of L Oilfield is characterized by strong heterogeneity with the development of fractures and dissolution pores, which brought out big challenge for reservoir evaluation and production. Logging while drilling (LWD) image logging can provide resistivity images with high resolution, which can give decision-makers an in-depth understanding on the sedimentary and structural characteristics of reservoirs. The high-resolution resistivity image is utilized for the first time to identify reef limestone category, evaluate fracture, analyze secondary dissolution porosity and investigate productivity controlling factors. The results show that rock types of reef limestone can be distinguished accurately by high-resolution resistivity image data. Moreover, fracture types and characteristics can be evaluated precisely by LWD image. Furthermore, qualitive and quantitative analysis of dissolution pores are carried out based on LWD image logging. In addition, the main control factors of reef limestone reservoir productivity are discussed based on all the interpretation results. All related evaluation results are consistent with the operation output of oilfield production and water control technology. The comprehensive analysis of highresolution resistivity imaging not only achieve the objective of fine characterization of reef limestone reservoir, but also provide a strong reference for the design of reef limestone reservoir completion plan and give decision-makers a specific interpretation model for similar oil/gas field.

Key words: reef limestone, LWD borehole image log, reservoir characteristics, detailed characterization, Pearl River Mouth Basin

CLC Number: