Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 159-168.doi: 10.12108/yxyqc.20230215

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Reservoir sensitivity of Neogene Guantao Formation in Zhanhua Sag, Bohai Bay Basin

YAO Xiutian, WANG Chao, YAN Sen, WANG Mingpeng, LI Wan   

  1. Gudao Oil Production Plant, Shengli Oilfield Company, Sinopec, Dongying 257000, Shandong, China
  • Received:2022-08-21 Revised:2022-09-01 Published:2023-03-07

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Abstract: Reservoir sensitivity analysis is an important means to evaluate the degree of reservoir damage, which is of great significance for the later efficient development and remaining oil tapping. The core samples from Neogene Guantao Formation in Kenxi oilfield of Zhanhua Sag in Bohai Bay Basin were selected to analyze the damage index and sensitivity characteristics of reservoirs of Guantao Formation in combination with thin section observation, X-ray diffraction analysis, mercury injection test and flowing water drive experiment. The results show that:(1) The Guantao Formation in Zhanhua Sag of Bohai Bay Basin is loosely cemented. The pore structure is characterized by large pore size, uniform distribution of pore throat and good connectivity. The rock minerals are mainly composed of quartz, plagioclase, K-feldspar and rock debris, and the clay minerals mainly include kaolinite, illite, chlorite and chlorite-illite mixed layer. The upper member of Guantao Formation is dominated by fine grains, while the lower member is dominated by medium grains.(2) The reservoirs of Guantao Formation are generally characterized by medium velocity sensitivity, weak alkali sensitivity and weak salt sensitivity. The acid sensitivity characteristics of the upper and lower members are quite different. The upper member has non-acid sensitivity characteristics, while the lower member has strong acid sensitivity characteristics with index of 78.25%.(3) The content of ankerite and chlorite and pore structure of Guantao Formation in the study area control the reservoir sensitivity.(4) Controlling of injection-production flow rate is an important content of the development plan in the study area, while the reservoir damage caused by acid sensitivity in the lower member of Guantao Formation should be protected and treated.

Key words: reservoir sensitivity, pore structure, clay mineral, reservoir damage, Guantao Formation, Neogene, Zhanhua Sag, Bohai Bay Basin

CLC Number: 

  • TE122.2+3
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