石油勘探与开发 >

2020 , Vol. 47 >Issue 1: 98 - 109

DOI: https://doi.org/10.11698/PED.2020.01.09

油气勘探

东海西湖凹陷中央反转构造带古近系花港组致密砂岩储集层控制因素

  • 徐昉昊 ,
  • 徐国盛 ,
  • 刘勇 ,
  • 张武 ,
  • 崔恒远 ,
  • 王亦然
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  • 1. 油气藏地质及开发工程国家重点实验室（成都理工大学）,成都 610059;
    2. 中国石化西南油气分公司采气四厂,重庆 402160;
    3. 中海石油（中国）有限公司上海分公司,上海 200335
徐昉昊（1988-）,男,江苏泰州人,博士,成都理工大学讲师,主要从事储集层地质学、流体地球化学与油气成藏等方面的研究工作。地址：成都市成华区二仙桥东三路1号,成都理工大学能源学院,邮政编码：610059。E-mail：xufanghao17@cdut.edu.cn

收稿日期: 2018-12-02

  网络出版日期: 2020-01-17

基金资助

“十三五”国家科技重大专项（2016ZX05027-002-006）; 油气藏地质及开发工程国家重点实验室（成都理工大学）开放基金（PLC20180305）

收起

Factors controlling the development of tight sandstone reservoirs in the Huagang Formation of the central inverted structural belt in Xihu sag, East China Sea Basin

  • XU Fanghao ,
  • XU Guosheng ,
  • LIU Yong ,
  • ZHANG Wu ,
  • CUI Hengyuan ,
  • WANG Yiran
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  • 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu 610059, China;
    2. No. 4 Gas Production Plant of Sinopec Southwest Oil & Gas Company, Chongqing 402160, China;
    3. CNOOC (China) Co., Ltd. Shanghai Branch, Shanghai 200335, China

Received date: 2018-12-02

  Online published: 2020-01-17

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摘要

采用岩石薄片鉴定、锆石U-Pb测年、扫描电镜、电子探针、激光微区碳氧同位素组成分析等技术手段,对东海盆地西湖凹陷古近系花港组致密砂岩储集层开展了岩石学特征、成岩环境演变以及储集层发育控制因素的综合研究。研究发现,中央反转构造带花港组砂岩物性整体较差,岩石类型以长石岩屑质石英砂岩为主,石英含量高,碎屑颗粒粗,杂基、高岭石、胶结物含量低;有机酸和大气淡水所形成的酸性成岩环境对次生孔隙的形成意义重大;花港组致密砂岩中相对优质储集层的发育与分布受控于沉积物源、沉积相带、成岩环境演变及异常高压。沉积物源及优势沉积相使得花港组砂岩具有良好的原始物性,是后期相对优质储集层发育的先决条件,异常高压对花港组储集层物性的改善主要体现在对原生孔隙的保护。纵向上,成岩环境演变差异性导致了花港组相对优质储集层集中分布于酸性成岩环境中;横向上,中北部相对优质储集层集中分布于异常高压发育的花港组下段,中南部集中分布于埋藏相对较浅的花港组上段。图13表4参27

关键词： 东海盆地; 西湖凹陷; 古近系花港组; 致密砂岩; 沉积物源; 沉积相带; 成岩环境; 控制因素

本文引用格式

徐昉昊 , 徐国盛 , 刘勇 , 张武 , 崔恒远 , 王亦然 . 东海西湖凹陷中央反转构造带古近系花港组致密砂岩储集层控制因素[J]. 石油勘探与开发, 2020 , 47(1) : 98 -109 . DOI: 10.11698/PED.2020.01.09

Abstract

By means of thin section analysis, zircon U-Pb dating, scanning electron microscopy, electron probe, laser micro carbon and oxygen isotope analysis, the lithologic features, diagenetic environment evolution and controlling factors of the tight sandstone reservoirs in the Huagang Formation of Xihu sag, East China Sea Basin were comprehensively studied. The results show that: the sandstones of the Huagang Formation in the central inverted structural belt are poor in physical properties, dominated by feldspathic lithic quartz sandstone, high in quartz content, low in matrix, kaolinite and cement contents, and coarse in clastic grains; the acidic diagenetic environment formed by organic acids and meteoric water is vital for the formation of secondary pores in the reservoirs; and the development and distribution of the higher quality reservoirs in the tight sandstones of the Huagang Formation are controlled by sediment source, sedimentary facies belt, abnormal overpressure and diagenetic environment evolution. Sediment provenance and dominant sedimentary facies led to favorable initial physical properties of the sandstones in the Huagang Formation, which is the prerequisite for development of reservoirs with better quality later. Abnormal overpressure protected the primary pores, thus improving physical properties of the reservoirs in the Huagang Formation. Longitudinally, due to the difference in diagenetic environment evolution, the high-quality reservoirs in the Huagang Formation are concentrated in the sections formed in acidic diagenetic environment. Laterally, the high-quality reservoirs are concentrated in the lower section of the Huagang Formation with abnormal high pressure in the middle-northern part; but concentrated in the upper section of Huagang Formation shallower in burial depth in the middle-southern part.

Key words： East China Sea Basin; Xihu sag; Paleogene Huagang Formation; tight sandstone; sediment provenance; sedimentary facies belt; diagenetic environment; controlling factors

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