石油学报 ›› 2018, Vol. 39 ›› Issue (3): 247-265.DOI: 10.7623/syxb201803001

• 地质勘探 •    下一篇

陆相湖盆致密砂岩油气储层储集性能表征与成储机制——以松辽盆地南部下白垩统泉头组四段为例

操应长1,2, 葸克来1, 刘可禹1,2, 朱如凯3, 远光辉1, 张响响3, 宋明水4   

  1. 1. 中国石油大学地球科学与技术学院 山东青岛 266580;
    2. 青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室 山东青岛 266071;
    3. 中国石油勘探开发研究院 北京 100083;
    4. 中国石油化工股份有限公司胜利油田分公司油气勘探管理中心 山东东营 257017
  • 收稿日期:2017-10-23 修回日期:2018-02-05 出版日期:2018-03-25 发布日期:2018-04-10
  • 通讯作者: 葸克来,男,1988年8月生,2010年获中国石油大学(华东)学士学位,2016年获中国石油大学(华东)博士学位,现为中国石油大学(华东)博士后、首届全国博士后创新人才支持计划获得者,主要从事油气储层地质学方面的教学与科研工作。Email:kelai06016202@163.com
  • 作者简介:操应长,男,1969年1月生,1992年获石油大学(华东)学士学位,2003年获中国科学院博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事沉积学、层序地层学及油气储层地质学方面的教学与科研工作。Email:cyc8391680@163.com
  • 基金资助:

    国家自然科学基金项目(No.41702141,No.U1762217)、全国博士后创新人才支持计划项目(BX201600154)、中国博士后科学基金面上项目(2016M600568)和中央高校基本科研业务费专项(15CX08001A)资助。

Reservoir properties characterization and its genetic mechanism for tight sandstone oil and gas reservoir in lacustrine basin: the case of the fourth Member of Lower Cretaceous Quantou Formation in the southern Songliao Basin

Cao Yingchang1,2, Xi Kelai1, Liu Keyu1,2, Zhu Rukai3, Yuan Guanghui1, Zhang Xiangxiang3, Song Mingshui4   

  1. 1. School of Geosciences, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Shandong Qingdao 266071, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    4. Exploration Management Center, Sinopec shengli Oilfield Company, Shandong Dongying 257017, China
  • Received:2017-10-23 Revised:2018-02-05 Online:2018-03-25 Published:2018-04-10

摘要:

在致密砂岩油气储层相关研究成果的基础上,结合对松辽盆地南部下白垩统泉头组四段致密砂岩油气储层的研究,认为储集空间类型与特征、孔喉大小与分布、孔喉连通性及不同尺度孔喉物性贡献等是致密砂岩油气储层储集性能表征的核心内容。将铸体薄片观察、扫描电镜分析及微米CT扫描等手段相结合实现了储层储集空间与孔喉结构类型、形貌、分布及连通性等的定性表征;恒速压汞与高压压汞的有机结合实现了致密砂岩储层孔喉大小、分布、连通性及不同尺度孔喉物性贡献等特征的定量表征。致密砂岩油气成储机制研究主要涉及储层成岩演化与致密化机理、致密砂岩油气藏成因类型及致密砂岩油气充注与聚集等方面的内容。以成岩演化为约束,恢复地质历史时期储层物性演化过程,结合关键成岩作用对储层物性的贡献量,明确储层致密化时间与决定因素,是砂岩储层致密化机理研究的重点;以此为基础,将油气充注史与致密化史相结合,可以确定致密砂岩油气藏成因类型。对于"先致密,后成藏"型致密砂岩油气藏,孔喉结构及其配置关系控制油气能否进入致密砂岩储层,而储层润湿性的改变则影响油气在其中如何聚集。

关键词: 储集性能, 成储机制, 致密砂岩, 油气储层, 泉头组, 陆相湖盆

Abstract:

According to the studies on the fourth Member of Lower Cretaceous Quantou Formation tight sandstones in southern Songliao Basin, combined with previous related study achievements, the authors consider that reservoir space types and features, pore-throat size and distribution, pore-throat connectivity and contributions of pore-throats with different sizes on reservoir properties are main contents of reservoir properties characterization. Among them, blue or red epoxy resin-impregnated thin sections, SEM and micro-CT are mainly used for pore space type identification, pore-throat distribution and connectivity characterization qualitatively. Combined with pressure controlled and rate controlled mercury injection, pore-throat size and distribution, pore-throat connectivity and contributions of pore-throats with different sizes on reservoir properties are characterized quantitatively. Studies on genetic mechanism of tight sandstone reservoirs mainly refer to diagenesis evolution and densification mechanism, genetic types of tight sandstone oil reservoirs, oil emplacement and accumulation mechanism etc. Recovering the reservoir evolution process during geological time constrained by diagenesis evolution and clarifying the time and dominated factors of densification combined with contributions of key diagenesis on reservoir properties are the main aspects for densification mechanism studies on tight sandstone reservoirs. Based on the above, genetic types of tight sandstone oil reservoirs can be confirmed by comparing to oil accumulation history and sandstone densification history. As to the reservoirs for oil emplacement occurred later than tight rock formed, pore-throat structures and their matching relationships determine whether the oil can charge into the tight sandstone reservoirs, while wettability changes control how the oil accumulates in the tight sandstone reservoirs.

Key words: reservoir properties, genetic mechanism of reservoirs, tight sandstones, oil and gas reservoirs, Quantou Formation, lacustrine basin

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