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天然气地球科学

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东营凹陷北带沙四下亚段深层砂砾岩储层储集空间特征及成因机制

王淑萍,徐守余，董春梅，王丽萍     

  1. 1.中国石油大学(华东)地球科学与技术学院，山东 青岛 266580;
    2.中国石化胜利油田东胜集团股份公司，山东 东营 257000
  • 收稿日期:2013-08-09 修回日期:2013-10-14 出版日期:2014-08-10 发布日期:2014-08-10
  • 作者简介:王淑萍(1978-)，女，甘肃民勤人，博士研究生，主要从事油气储层评价研究. E-mail:wshpwyzh0619@163.com.
  • 基金资助:
    国家科技重大专项(编号:2011ZX05009-003)；中央高校基本科研业务费专项资金项目(编号:12CX04001A;13CX02035A)联合资助.
     

Reservoir-space Characteristics and Genetic Mechanism of Deep Glutenite Reservoirof  Esx4  in the North Zone of the Dongying Depression

WANG Shu-ping，XU Shou-yu，DONG Chun-mei，WANG Li-ping   

  1. 1.School of Geosciences in China University of Petroleum,Qingdao 266580,China;
    2.Dongsheng Group Co.,Ltd.of Shengli Oil Field,SINOPEC,Dongying 257000,China
  • Received:2013-08-09 Revised:2013-10-14 Online:2014-08-10 Published:2014-08-10

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摘要：

东营凹陷民丰洼陷北带沙四下亚段深层砂砾岩储层储集空间特征及成因机制认识不清的问题，给该地区油气勘探带来了极大的风险。综合运用薄片鉴定、扫描电镜观察、流体包裹体分析及岩心物性分析等多种技术方法，结合压力演化史、油气成藏史、有机质热演化史等研究成果，对东营凹陷北带沙四下亚段砂砾岩储层储集空间特征及成因机制进行了系统研究。结果表明，东营凹陷北带沙四下亚段砂砾岩储层储集空间以残余原生孔隙为主，相对含量占60%以上，含有少量的次生溶蚀孔隙及微裂缝。在早期异常高压、早期油气充注以及膏岩层的发育等多种因素的综合作用下，东营凹陷北带沙四下亚段砂砾岩储层原生孔隙得以有效的保存至深层，从而为油气聚集提供了优质的储集空间；沙四下亚段深层砂砾岩储层经历了酸性→碱性→酸性的溶解过程，溶解作用相对较弱，次生孔隙含量低，对储层物性的贡献量小。
 

关键词: 储集空间, 成因机制, 沙四下亚段, 砂砾岩体, 东营凹陷北带

Abstract:

The reservoir-space characteristics and its genetic mechanism of deep glutenite reservoir in the lower part of the fourth member of the Shahejie Formation(Esx4 )in the north zone of the Minfeng Sag in the Dongying Depression haven′t been clearly understood,and it has brought out great risks to hydrocarbon exploration.Based on a combination of thin-section identification,scanning electron microscope(SEM)observation,fluid inclusion analysis and an analysis of core properties,in addition to knowledge on the pressure evolution history,the history of hydrocarbon accumulation and the thermal evolution of organic matters,systematic study has been carried out about the reservoir-space characteristics and its genetic mechanism of glutenite reservoir in Esx4 in the north zone of the Dongying Depression.The reservoir-space of glutenite reservoir is mainly residual primary pores in Esx4  in the north zone of the Dongying Depression whose relative content is more than 60%,with a small amount of secondary dissolution-pores and microcrack.As a result of the combination of early abnormal high pressure,early hydrocarbon-filling as well as the development of gypsum-salt bed,the primary pores of the glutenite reservoir in Esx4in the north zone of the Dongying Depression are effectively reserved to the deep,which has provided high-quality reservoir-space for hydrocarbon-accumulation.The glutenite reservoir has experienced the dissolution process of “acid-alkaline-acid”,and the dissolution is weaker with a small amount of secondary pores,which contributes little to its physical properties.

Key words: Reservoir space;Genetic mechanism, Esx4, Glutenite body, North zone of the Dongying Depression

中图分类号: 

  • TE122.2+3

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