Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (5): 49-61.doi: 10.12108/yxyqc.20230505

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Reservoir diagenesis and pore evolution of Paleogene Pinghu Formation in Kongqueting area of Xihu Sag，East China Sea Basin

LI Shengqian1,2, ZENG Jianhui1, LIU Yazhou1, LI Miao3, JIAO Panpan1   

  1. 1. PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    2. State Key Laboratory of Oil and Gas Resources and Exploration, China University of Petroleum(Beijing), Beijing 102249, China;
    3. PetroChina Changqing Oilfield Company, Xi'an 710200, China
  • Received:2022-02-21 Revised:2022-03-21 Online:2023-09-01 Published:2023-09-28

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Abstract: Kongqueting area in Xihu Sag of the East China Sea Basin is highly explored and rich in oil and gas. Through the data of cast thin section，scanning electron microscope and X-diffraction，the diagenesis of Pinghu Formation and its influence on pore evolution in Kongqueting area of Xihu Sag were analyzed. The results show that：（1）The Pinghu Formation in Kongqueting area of the East China Sea Basin is mainly delta-bay sedimentary environment. The lower and upper parts of the lower member of Pinghu Formation are mainly tidal flat sedimentary environment，and the middle and upper members of Pinghu Formation transit from tidal flat to delta sedimentary environment.（2）The reservoir rocks of Pinghu Formation in Kongqueting area are mainly feldspathic lithic sandstone，with medium composition maturity and high structural maturity. It is a low porosity and low permeability reservoir，with an average porosity of 10.44% and an average permeability of 25.65 mD.（3）The study area has experienced a variety of diagenesis. Compaction reduces reservoir physical properties，cementation makes the reservoir physical properties poor，but to a certain extent，the cements can resist compaction and protect the primary intergranular pores，and dissolution is an important factor to improve reservoir physical properties.（4）The reservoir in the study area is mainly in the late diagenetic A2 stage. Two secondary pore development zones were formed at 3 000-3 500 m and 4 000-4 400 m. The relatively high quality reservoirs are conducive to hydrocarbon accumulation.

Key words: diagenesis, pore evolution, Paleogene, Kongqueting area, Xihu Sag, East China Sea Basin

CLC Number: 

  • TE122.2
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