松辽盆地北部葡萄花油田泉四段扶余油层致密油成岩特征及成岩相  

Diagenesis characteristics and diagenetic facies of tight oil reservoir in Fuyu oil layer of 4^(th)Quantou Formation in Putaohua Oilfield,North Songliao Basin

作　　者：来广军 LAI Guangjun(No.4 Oil Production Plant,Daqing Oilfield Company Limited,CNPC,Daqing 163357,Heilongjiang)

机构地区：[1]大庆油田有限责任公司第四采油厂,黑龙江大庆163357

出　　处：《长江大学学报（自然科学版）》2024年第6期9-22,共14页Journal of Yangtze University(Natural Science Edition)

基　　金：国家科技重大专项“松辽盆地致密油开发示范工程”(2017ZX05071)。

摘　　要：为明确葡萄花油田扶余油层致密油相对优质储层分布,综合铸体薄片、扫描电镜、核磁和微米CT等测试,在致密油储层特征和成岩作用分析基础上,开展成岩相定量划分。结果表明:①扶余油层以残余粒间孔、晶间微孔为主,次为粒内溶孔、粒间溶孔,孔隙、喉道半径分别为0.82~39.42μm和0.02~1.28μm,平均为4.96μm和0.68μm,为微纳米孔隙+纳米喉道。②扶余油层视压实率和视胶结率高达56%和35%,强烈的机械压实、早期方解石和伊利石充填堵塞粒间孔隙和喉道,是导致储层致密化的重要原因。③绿泥石包壳减缓压实强度、保留了部分原生孔,长石和火山岩岩屑的酸性溶蚀形成各类次生孔隙,是形成相对优质储层的关键。④通过多种成岩强度参数的Q型聚类将扶余油层分为4种成岩相,弱胶结强溶蚀次生溶孔相和弱压实强溶蚀残余粒间孔相物性好、试油产能高,是扶余油层有利储层类型。To clarify the distribution of relatively high-quality reservoirs in Fuyu oil layer of Putaohua Oilfield,a comprehensive study was conducted based on cast thin sections,scanning electron microscopy,nuclear magnetic resonance,and micro-CT analyses.This study involved the characterization of tight oil reservoir features and diagenetic processes,followed by quantitative diagenetic facies division.The results indicate that:①Fuyu oil layer is predominantly characterized by residual intergranular pores and intercrystalline micropores,with intra-granular dissolution pores and intergranular dissolution pores being secondary.Pore and throat radii range from 0.82μm to 39.42μm and 0.02μm to 1.28μm,respectively,with averages of 4.96μm and 0.68μm,classifying them as micro-nano pores+nano throats.②Fuyu oil layer exhibits high visual compaction rates and cementation rates of up to 56%and 35%,respectively.Intense mechanical compaction,along with early calcite and illite infillings that obstruct intergranular pores and throats,are key factors leading to reservoir densification.③Chlorite coatings mitigate compaction intensity and preserve some primary pores,while acidic dissolution of feldspar and volcanic rock clasts forms various types of secondary pores,which are crucial for the formation of relatively superior reservoirs.④Through Q-type clustering of multiple diagenetic intensity parameters,Fuyu oil layer is classified into four diagenetic facies.The weakly cemented,strongly leached secondary pore facies and the weakly compacted,strongly leached residual intergranular pore facies exhibit favorable properties and high oil production in testing,representing the advantageous reservoir types within Fuyu oil layer.

关 键 词：成岩特征 成岩相 微纳米孔 致密油 扶余油层 

分 类 号：TE122.2[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]