东海盆地西湖凹陷花港组储层孔隙演化与油气充注关系

刘勇; 徐国盛; 曾兵; 徐昉昊; 张武; 高耀; 袁海锋

doi:10.11781/sysydz201802168

东海盆地西湖凹陷花港组储层孔隙演化与油气充注关系

doi: 10.11781/sysydz201802168

刘勇¹,
徐国盛^1, ,,
曾兵¹,
徐昉昊¹,
张武²,
高耀¹,
袁海锋¹

1.
成都理工大学油气藏地质及开发工程国家重点实验室, 成都 610059
2. 中海石油(中国)有限公司上海分公司, 上海 200335

基金项目: “十三五”国家重大专项项目“深层优势储层孔喉结构及成岩环境分析技术”（2016ZX05027002-006）资助。

详细信息

作者简介:
刘勇(1988-),男,博士研究生,从事油气藏地质学及油气成藏地球化学研究。E-mail:917200799@qq.com。

通讯作者:
徐国盛(1962-),男,博士,教授,从事储层评价与油气藏研究。E-mail:xgs@cdut.edu.cn。

中图分类号: TE122.23
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出版历程
- 收稿日期: 2017-08-15
- 修回日期: 2018-01-26
- 刊出日期: 2018-03-28

Relationship between porosity evolution and hydrocarbon charging in tight sandstone reservoirs in Oligocene Huagang Formation, Xihu Sag, East China Sea Basin

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology), Chengdu, Sichuan 610059, China
2. Shanghai Branch of CNOOC(China) Co. Ltd., Shanghai 200335, China

摘要

摘要: 采用岩石薄片鉴定、扫描电镜、电子探针、流体包裹体分析等测试技术，在储层基本特征分析基础之上，结合埋藏史、热演化史，利用孔隙恢复定量计算方法，对东海盆地西湖凹陷中央反转构造带中北部渐新统花港组致密砂岩储层的孔隙演化进行系统恢复，并探讨了孔隙演化与油气充注关系。研究表明，花港组储层孔隙演化主要经历了早成岩B期末的14.28%，中成岩A期末的10.35%，中成岩B期的8.75%。伴随储层成岩-孔隙演化，花港组储层先后接受了3期油气充注。第一、二期（19~17 Ma和17~9 Ma）油气充注发生于储层尚未致密的中成岩A期末以前，尽管其成藏意义不大，但充注带入的有机酸性流体却对储层物性改善起到了关键性作用，为后续油气充注提供了有利条件。第三期（7~0 Ma）大规模油气充注发生于储层逐渐致密化的中成岩A期末-中成岩B期，主要充注对象为埋深较浅且尚未完全致密化的花港组H3小层。因此，H3小层是现今花港组在总体致密化背景下相对最为有利的油气勘探目标。
- 孔隙演化 /
- 油气充注 /
- 花港组 /
- 渐新统 /
- 西湖凹陷 /
- 东海盆地
Abstract: The pore evolution of tight sandstone reservoirs in the Oligocene Huagang Formation in the central and northern parts of the central reversal structural belt in the Xihu Sag of the East China Sea Basin was recovered based on the analyses of reservoir properties, burial history and thermal evolution history, and using cast thin section identification, scanning electronic microscope, electron microprobe, fluid inclusion analyses and porosity recovery quantified calculation. The relationship between porosity evolution and hydrocarbon charging was also discussed. The results showed that the porosity evolution in the Huagang Formation can be classified into three stages:14.28% in the stage B of early diagenesis, 10.35% in the stage A of middle diagenesis, and 8.75% in the stage B of middle diagenesis, accompanied by three stages of hydrocarbon charging. The first (19-17 Ma) and second (17-7 Ma) stages of hydrocarbon charging took place before the end of stage A of middle diagenesis. The reservoirs were not tight yet, and the acidic fluid brought by hydrocarbon charging played an important role in reservoir reformation, providing favorable porosity and permeability for later hydrocarbon charging. The third stage (7-0 Ma) of massive hydrocarbon charging happened from the end of stage A to the stage B of middle diagenesis, when reservoirs compacted gradually. The third section of Huagang Formation, buried shallow and was not tight yet, showed relatively better reservoir properties and became a main charging target. It is now the most favorable hydrocarbon exploration target for the Huaguang Formation in the overall densification background.
- porosity evolution /
- hydrocarbon charging /
- Huagang Formation /
- Oligocene /
- Xihu Sag /
- East China Sea Basin

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