Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 118-125.doi: 10.12108/yxyqc.20220610

• PETROLEUM EXPLORATION • Previous Articles    

Lithology prediction technology and its application of Paleogene Wenchang Formation in Panyu 4 depression，Pearl River Mouth Basin

ZHANG Weiwei1, LIU Jun1, LIU Lihui2, ZHANG Xiaozhao1, BAI Haijun1, YANG Dengfeng1   

  1. 1. Shenzhen Branch, CNOOC China Limited, Shenzhen 518054, China;
    2. Beijing Rockstar Petroleum Technology Co., Ltd., Beijing 100083, China
  • Received:2022-04-29 Revised:2022-06-12 Published:2022-11-09

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Abstract: The Paleogene of Panyu 4 depression in the Pearl River Mouth Basin has great exploration potential， and several wells produce oil and gas in Paleogene. The ray elastic impedance was expressed as a function of P-wave impedance and S-wave impedance， and Poisson reflectance data with Poisson impedance meaning were extracted from the gathers. Poisson impedance inversion was carried out through angle scanning sensitive angle stacking data， and the plane distribution of sandstone of Paleogene in Panyu 4 depression of Pearl River Mouth Basin was predicted. The results show that： （1）the lithology of Paleogene Wenchang Formation in Panyu 4 depression is complex， including mudstone，carbonaceous mudstone，siltstone and sandstone. The sandstone is characterized by high Poisson impedance， corresponding to the peak reflection on the seismic profile， and the mudstone is characterized by low Poisson impedance，corresponding to wave trough reflection on seismic profile.（2）Different lithology has different sensitive angles. Through forward modeling and angle scanning of actual data，it is considered that 20°-25° stacking data can highlight the seismic response of sandstone.（3）Sandstone reservoirs are developed in the second， third and fourth members of Wenchang Formation in the study area， the sandstone reservoirs of the third member vary greatly laterally，and the favorable areas are mainly distributed in the east of well A，which is the next favorable exploration target.

Key words: prestack inversion, ray domain, Poisson impedance reflectance, lithology prediction, Wenchang Formation, Paleogene, Panyu 4 depression, Pearl River Mouth Basin

CLC Number: 

  • TE122
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