摘要
松辽盆地南部长岭断陷查干花次凹火石岭组碱性火山碎屑岩储层矿物岩石成分和组构复杂,储层成因机理、成岩作用及主控因素认识不清,制约了优质储层预测和精细刻画,影响了气藏的进一步高效开发。通过镜下观察、全岩矿物分析、压汞和纳米CT扫描,并结合特殊测井,系统开展了岩石学特征、火山岩相特征、储层微观特征和裂缝特征研究。结果表明:研究区主要有脱玻化、溶蚀、蚀变等7种成岩作用,在此基础上明确了查干花次凹火山碎屑岩储层发育主控因素,认为该区火山碎屑岩属于富钠碱性火山岩,碎屑类型、矿物成分和岩石粒度是决定储层品质的物质基础,后期经过脱玻化、溶蚀和蚀变作用产生3种不同类型次生孔隙,同时构造应力作用产生的大量天然裂缝有利于形成次生孔隙,对储层微观渗流起到了改善和沟通作用,形成了具有“三孔一缝”的储层特征和独特的微观渗流场。这一认识对富钠碱性火山碎屑岩储层评价和甜点预测具有一定的指导意义,为气藏后续高效开发奠定了坚实的基础。
The mineral and rock composition and fabric of the alkaline volcanic clastic rock reservoir in the Chaganhua sub-sag of the Changling Fault Depression in the southern Songliao Basin are complex,and the genetic mechanism,diagenesis,and main controlling factors of the reservoir are unclear,which restricts the prediction and fine characterization of high-quality reservoirs and affects the further efficient development of gas reservoirs.Through microscopic observation,whole rock mineral analysis,mercury intrusion,and nano CT scanning,combined with special logging,this article systematically analyzes the petrological characteristics,volcanic lithofacies characteristics,reservoir microscopic characteristics,and fracture characteristics.It is believed that there are seven main types of diagenesis in the area,including devitrification,dissolution,and alteration.Based on this,the main controlling factors for the development of volcanic clastic rock reservoirs in the Chaganhua sub-sag are clarified.It is believed that the volcanic detrital rocks in this area belong to sodium rich alkaline volcanic rocks,and the type,mineral composition,and rock particle size of the detrital rocks are the material basis for determining the quality of the reservoir.In the later stage,three different types of secondary pores are generated through devitrification,dissolution,and alteration.At the same time,a large number of natural fractures generated by tectonic stress are conducive to the formation of secondary pores,which improves and communicates the microscopic seepage of the reservoir.The formation of a reservoir with the characteristics of"three pores and one fracture"and a unique microscopic seepage field has certain guiding significance for the evaluation and dessert prediction of sodium rich alkaline volcanic clastic rock reservoirs,laying a solid foundation for the subsequent efficient development of gas reservoirs.
作者
钟高明
赵向原
石磊
赵密福
孙楠
吴冷
蔡潇
夏威
于涛
Gaoming ZHONG;Xiangyuan ZHAO;Lei SHI;Mifu ZHAO;Nan SUN;Leng WU;Xiao CAI;Wei XIA;Tao YU(Northeast Oil&Gas Branch,SINOPEC,Changchun 130062,China;Petroleum Exploration&Production Research Institute,SINOPEC,Beijing 100083,China;College of Mining,Liaoning Technical University,Fuxin 123000,China;Laboratory of Exploration and Development Research Institute of SINOPEC East China Oil and Gas Branch,Nanjing 210019,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2024年第1期84-95,共12页
Natural Gas Geoscience
基金
中国石油化工股份有限公司科技项目“松南断陷火山岩气藏一体化技术研究与应用”(编号:P21104)资助~~。
关键词
火山碎屑岩
储层特征
成岩作用
火石岭组
松辽盆地
Volcanic clastic rock
Reservoir characteristics
Diagenesis
Huoshiling Formation
Songliao Basin