岩性油气藏 ›› 2022, Vol. 34 ›› Issue (6): 118–125.doi: 10.12108/yxyqc.20220610

• 地质勘探 • 上一篇    下一篇

珠江口盆地番禺4洼古近系文昌组岩性预测技术及应用

张卫卫1, 刘军1, 刘力辉2, 张晓钊1, 白海军1, 杨登锋1   

  1. 1. 中海石油 (中国) 有限公司深圳分公司, 深圳 518054;
    2. 北京诺克斯达石油科技有限公司, 北京 100083
  • 收稿日期:2022-04-29 修回日期:2022-06-12 出版日期:2022-11-01 发布日期:2022-11-09
  • 第一作者:张卫卫(1979-),男,硕士,高级工程师,主要从事油气勘探及储层预测和烃类检测方面的研究工作。地址:(518054)广东省深圳市南山区后海滨路3168号。Email:zhangww@cnooc.com.cn。
  • 基金资助:
    中国海洋石油集团有限公司“十四五”重大科技项目“陆缘裂谷盆地深层/超深层油气成藏条件与成藏机制研究——珠江口盆地珠一坳陷”（编号： KJGG2022-0403）资助

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 Online:2022-11-01 Published:2022-11-09

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摘要： 珠江口盆地番禺4洼古近系具有较大的勘探潜力，多口钻井在古近系产出油气。将射线弹性阻抗表示为纵波阻抗和横波阻抗的函数，从道集内提取具有泊松阻抗意义的泊松反射率数据，并通过角度扫描敏感角度叠加的数据进行泊松阻抗反演，预测了珠江口盆地番禺4洼古近系砂岩平面展布。研究结果表明：①番禺4洼古近系文昌组岩性复杂，包括泥岩、炭质泥岩、粉砂岩及砂岩等，砂岩为高泊松阻抗特征，对应地震剖面上的波峰反射，泥岩为低泊松阻抗特征，对应地震剖面上的波谷反射。②不同岩性的敏感角度不同，通过正演模拟及实际资料的角度扫描，认为20°～25°叠加数据可以突出砂岩的地震响应。③研究区文昌组二段、三段和四段均有砂岩储层发育，其中文三段砂岩储层横向变化大，有利区域主要分布于A井东侧，为下一步有利勘探目标。

关键词: 叠前反演, 射线域, 泊松阻抗反射率, 岩性预测, 文昌组, 古近系, 番禺4洼, 珠江口盆地

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

中图分类号: 

  • TE122
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