渤海海域中生界火山岩潜山有效储层特征及控制因素  

Characteristics and Control Factors of Effective Reservoirs in Mesozoic Volcanic Buried Hill of the Bohai Sea Area

作　　者：杨飞 刘娟霞 孙言啟 孙源 穆天喜 YANG Fei;LIU Juanxia;SUN Yanqi;SUN Yuan;MU Tianxi(China-France Bohai Geoservices Co.,Ltd.,Tianjin 300452,China)

机构地区：[1]中法渤海地质服务有限公司,天津300452

出　　处：《西安石油大学学报(自然科学版)》2025年第2期33-41,共9页Journal of Xi’an Shiyou University(Natural Science Edition)

基　　金：中海石油(中国)有限公司“七年行动计划”重大科技专项“渤海油田上产4000万吨新领域勘探关键技术”(CNOOC-KJ 135 ZDXM 36 TJ 08 TJ)。

摘　　要：针对渤海海域中生界火山岩潜山储层特征不清、主控因素不明这一制约油气勘探的关键问题,综合利用岩心、壁心、薄片、实测物性以及测井资料,详细描述了储层类型及特征,并重点讨论了储层发育的主控因素,在此基础上建立了储层发育模式。结果表明:研究区火山岩以碱性系列为主,主要由粗面玄武岩、粗安岩、粗面岩、英安岩以及火山碎屑岩为主;储层原生孔隙与次生孔隙均发育,但以次生溶蚀孔与裂缝占主导。高压压汞资料分析表明,玄武岩与凝灰岩的孔径多小于100 nm,而粗面岩与英安岩具有大孔径占主导的多孔径特征,孔径峰值集中在1μm;火山岩有效储层的发育受岩相与风化作用共同控制,其中近源相带的隐爆角砾岩亚相以及中酸性溢流相上部亚相是主要的成储相带,风化作用控制了储层的宏观分布,不整合面之下300 m是火山岩储层的有利发育区,但喷发间断形成的次级旋回界面处因短期的暴露也可以形成较好的储层,最终建立了“多级风化-优势岩相”耦合下的火山岩潜山储层发育模式。In response to the characteristics and main controlling factors of the Mesozoic volcanic rock buried hill reservoirs in the Bohai Sea,the types and characteristics of the reservoirs were comprehensively described based on wellbore core,well wall core,thin sections,measured physical properties and logging data,and the main controlling factors of reservoir development were discussed.Based on this,a reservoir development mode was established.The results show that the volcanic rocks in the study area are mainly alkaline series,mainly composed of trachybasalt,trachyteandesite,trachyte,dacite,and volcanic clastic rocks.Both primary and secondary pores are developed in the reservoirs,but secondary dissolution pores and fractures dominate.The analysis of high-pressure mercury intrusion data shows that the size of pores in basalt and tuff is mostly less than 100 nm,while trachyte and andesite are dominated by large pore sizes,with peak pore sizes concentrated at 1μm.The development of effective reservoirs in volcanic rocks is controlled by both lithofacies and weathering,with the cryptoexplosive breccia subfacies in the near crater facies zone and the upper subfacies in the overflow facies being the main reservoir formation zones.Weathering controls the macroscopic distribution of reservoirs,with 300 m below the unconformity surface being a favorable development area for volcanic reservoirs.However,the secondary cycle interface formed by volcanic eruptions can also form good reservoirs due to short-term exposure.Finally,a formation mode of volcanic rock buried hill reservoirs was established under the coupling of multi-level weathering and dominant lithofacies.

关 键 词：火山岩潜山 储层特征 主控因素 储层发育模式 渤海海域 

分 类 号：TE132[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]