松辽盆地古龙页岩油富集耦合机制OA北大核心CSTPCD
Coupling mechanism of Gulong shale oil enrichment in Songliao Basin
大庆油田生产实践证实松辽盆地青山口组古龙页岩油具有巨大的勘探开发潜力,但页岩油富集的耦合机制仍不明确,制约了页岩油成藏理论及油气富集区的认识.通过岩心精描、古地温恢复、常微量元素分析、场发射环境扫描电镜分析、二维核磁分析等技术,明确了古龙页岩油富集的耦合机制.松辽盆地古龙页岩油富集受宏、微观多因素耦合控制:宏观上,古龙页岩油富集受控于43.99~77.28℃/km古地温梯度的高温热盆、大规模发育的富氢高有机质页岩、温湿淡水-微咸水还原水体环境及较强的顶底板封存能力4个地质因素;微观上,古龙页岩油富集受控于以有机质成熟度为主线的生烃与成储同步演化耦合,随着页岩成熟度不断增高,干酪根不断裂解,生烃量增加,有机缝孔的占比逐渐增大,无机孔占比逐渐减少,生成的油气由重质向轻质转化,吸附油占比减小,游离油占比增大.当Ro大于1.3%时,孔壁表面润湿性由亲水性向亲油性转变,原油不断从小尺度孔隙向大尺度孔隙渗流.研究成果可为古龙页岩油成藏理论认识的深化及富集区优选提供重要依据.
Production practice in Daqing Oilfield confirms huge exploration and development potential of Gulong shale oil in Qingshankou Formation of Songliao Basin,but coupling mechanism of shale oil enrichment is still un-clear,restricting the understanding of shale oil accumulation theory and hydrocarbon enrichment areas.Coupling mechanism of Gulong shale oil enrichment is clarified by detailed core description,paleogeothermal restoration,macro and trace elements analysis,field emission scanning electron microscope analysis and 2D nuclear magnetic resonance analysis.The research shows that the enrichment of Gulong shale oil in Songliao Basin is macroscopically and microscopically controlled by several factors coupling.Macroscopically,the enrichment of Gulong shale oil is controlled by 4 geological factors including high-temperature hot basin with paleogeothermal gradient of 43.99~77.28℃/km,large-scale developed hydrogen-rich organic matter-hosted shale,reducing water environment of warm and humid freshwater-brackish water and high sealing capacity of roofs and floors.Microscopically,the en-richment of Gulong shale oil is controlled by synchronous evolution coupling of hydrocarbon generation and accumu-lation with mainline of organic matter maturity.With the increase of shale maturity,kerogen continuously cracks,hydrocarbon generation increases,the proportion of organic fracture pores gradually increases,the proportion of in-organic pores gradually decreases,and the generated oil and gas gradually transform from heavy to light,with the proportion of adsorbed oil decreased and the proportion of free oil increased.When Ro is bigger than 1.3%,the pore wall surface changes from water wet to oil wet,and oil continuously flows from small-scale pores to large-scale pores.The enrichment of Gulong shale oil is controlled by dual coupling of macroscopic geological conditions and microscopic accumulation mechanisms.The research provides important evidence for deepening the understanding on accumulation theory and enrichment areas optimization of Gulong shale oil.
陆加敏;林铁锋;李军辉;付秀丽;崔坤宁;高波;白月;付晓飞
东北石油大学地球科学学院,黑龙江 大庆 163318||多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江 大庆 163712||中国石油大庆油田有限责任公司勘探开发研究院,黑龙江 大庆 163712多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江 大庆 163712||中国石油大庆油田有限责任公司勘探开发研究院,黑龙江 大庆 163712东北石油大学地球科学学院,黑龙江 大庆 163318
石油、天然气工程
耦合机制地温梯度古沉积环境赋存状态封存能力古龙页岩油青山口组松辽盆地
Coupling mechanismgeothermal gradientpaleosedimentary environmentoccurrence statesealing capacityGulong shale oilQingshankou FormationSongliao Basin
《大庆石油地质与开发》 2024 (003)
62-74 / 13
中国石油天然气股份有限公司重大科技专项"陆相页岩油规模增储上产与勘探开发技术研究"(2023ZZ15).
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