首页|吉南凹陷二叠系井井子沟组二段致密砂岩储层特征及影响因素

吉南凹陷二叠系井井子沟组二段致密砂岩储层特征及影响因素

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吉南凹陷是准噶尔盆地东部新发现的含油凹陷,其中二叠系井井子沟组二段是该凹陷最主要的含油层系.基于多口井的岩心常规分析、常规薄片、铸体薄片、扫描电镜及黏土矿物X射线衍射分析等资料,系统开展了吉南凹陷井井子沟组二段砂岩储层岩矿特征、储层物性及孔隙特征、影响储层物性的主要因素研究.研究表明,井井子沟组二段砂岩储层为低矿物成熟度、中等结构成熟度,属于低—特低孔、特低—超低渗、纳米级吼道、处于中成岩A期的致密储层特征.通过定性、半定量分析,认为压实作用、胶结作用,特别是早期碳酸盐胶结作用是导致致密储层形成的主要因素,中成岩期的溶蚀作用有效地改善了储层物性.计算结果表明,井井子沟组二段砂岩储层原始孔隙度平均约27.1％,压实作用及胶结作用减孔量平均为11.3％、9.8％,溶蚀作用增孔量平均约为3.4％.
Characteristics and influencing factors of tight sandstone reservoirs in the second member of the Permian Jingjingzigou Formation,Jinan Sag
The Jinan Sag is a newly discovered oil-bearing depression in the eastern Junggar Basin,and the second member of the Permian Jingjingzigou Formation is the most important oil-bearing system in this area.Based on the conventional analysis of cores,conventional sheets,cast sheets,scanning electron microscopy and X-ray diffraction analysis of clay minerals from multiple wells,the rock and mineral characteristics,reservoir physical properties,pore characteristics and main factors affecting reservoir physical properties of sandstone reservoirs in the second member of the Permian Jingjingzigou Formation were systematically studied.The results show that the sandstone reservoir of the second member of the Jingjingzigou Formation has low mineral maturity and medium structural maturity,and belongs to the characteristics of tight reservoirs of low-ultra-low porosity,extra-low-ultra-low permeability,nanoscale pore-throat and in the middle diagenetic A stage.On this basis,in-depth analysis through qualitative,semi-quantitative,it is clarified that compaction and cementation,especially early carbonate cementation,are the main controlling factors leading to the formation of tight reservoirs in this area.Besides,the dissolution in the middle diagenetic effectively improved the reservoir physical properties.The calculations show that the original porosity of the sandstone reservoir of the second member of the Permian Jingjingzigou Formation in Jinan Sag was about 27.1％on average.The average porosity lost by compaction and cementation is about 11.3％and 9.8％,and the porosity resulting from dissolution averages about 3.4％.

Jinan Sag in the eastern Junggar BasinSecond member of the Permian Jingjingzigou FormationReservoir rock and mineral characteristicsReservoir physical characteristicsThe controlling factor of reservoir properties

陈煦、邱波、石湘、白洁、李文霞、陈毓清、何伯斌

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中国石油吐哈油田分公司勘探开发研究院 新疆哈密 839009

中国石油西部钻探吐哈井下作业公司 新疆鄯善 838200

准噶尔盆地东部吉南凹陷 二叠系井井子沟组二段 储层岩矿特征 储层物性特征 储层物性影响因素

中国石油天然气股份有限公司科技项目&&中石油攻关性应用性科技专项

2021DJ18072022DJ21072023ZZ18

2024

10.12017/dzkx.2024.087

地质科学
中国科学院地质与地球物理研究所

地质科学

CSTPCD北大核心
影响因子：0.79
ISSN：0563-5020
年,卷(期)：2024.59(5)
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