岩性油气藏 ›› 2023, Vol. 35 ›› Issue (5): 49–61.doi: 10.12108/yxyqc.20230505

• 地质勘探 • 上一篇    下一篇

东海盆地西湖凹陷孔雀亭地区古近系平湖组储层成岩作用及孔隙演化

李盛谦1,2, 曾溅辉1, 刘亚洲1, 李淼3, 焦盼盼1   

  1. 1. 中国石油塔里木油田公司, 新疆 库尔勒 841000;
    2. 中国石油大学 (北京)油气资源与探测国家重点实验室, 北京 102249;
    3. 中国石油长庆油田公司, 西安 710200
  • 收稿日期:2022-02-21 修回日期:2022-03-21 出版日期:2023-09-01 发布日期:2023-09-28
  • 第一作者:李盛谦（1997—），男，硕士，主要从事油气藏的形成机理与分布规律等方面的研究工作。地址：（841000）新疆库尔勒市石化大道26号。Email：2683780144@qq.com。
  • 通信作者: 曾溅辉（1962—），男，博士，教授，主要从事油气成藏机理方面的教学与研究工作。Email：zengjh@cup.edu.cn。
  • 基金资助:
    国家自然科学基金面上项目 “基于润湿性影响下的深层低渗透砂岩油气成藏机理研究”（编号： 41972147） 资助。

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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摘要： 东海盆地西湖凹陷孔雀亭地区勘探程度高，油气资源丰富。根据薄片、扫描电镜及X射线衍射等资料，分析了孔雀亭地区平湖组成岩作用及其对孔隙演化的影响。研究结果表明： ①东海盆地孔雀亭地区平湖组主要为三角洲-海湾沉积环境，平下段下部和上部主要为潮坪沉积环境，平中段和平上段由潮坪沉积环境过渡为三角洲沉积环境。②孔雀亭地区平湖组储层岩石类型主要为长石岩屑砂岩，储层砂岩成分成熟度中等，结构成熟度高，为低孔低渗储层，平均孔隙度为10.44%，平均渗透率为25.65 mD。③研究区经历了多种成岩作用，压实作用降低了储层物性，胶结作用使储层物性变差，但在一定程度上也使得岩石具有抗压实作用，保护了原生粒间孔，溶蚀作用对储层物性具有一定的改善作用。④研究区储层主要处于晚成岩A2期，在3 000～3 500 m和4 000～4 400 m处形成了2个次生孔隙发育带，相对优质的储集性有利于油气的聚集成藏。

关键词: 成岩作用, 孔隙演化, 古近系, 孔雀亭地区, 西湖凹陷, 东海盆地

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

中图分类号: 

  • TE122.2
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