摘要
为研究志丹-甘泉地区晚三叠世储层特征以及成岩演化序列,在岩芯、测井分析的基础上,采用普通压汞、恒速压汞等间接测定技术与核磁共振、微米CT等直接观测技术相结合的方式对储层的微观孔隙结构进行研究。结果表明:志丹-甘泉地区晚三叠世储层以次生孔隙为主,发育粒间溶孔、粒内溶孔、填隙物内溶孔及微裂隙,其中常见粒内溶孔,长石溶孔多伴随粒内溶孔发育,填隙物溶孔为少量浊沸石溶蚀形成的孔隙,微裂缝溶孔发育较少;普通压汞确定了志丹甘泉地区储层排驱压力、中值压力的最小值,计算了进汞饱和度值以及退汞效率;恒速压汞试验总结了不同渗透率储层的喉道分布特征,认为喉道是决定渗流率的主要因素;核磁共振T2谱的弛豫时间与储层的孔隙度呈正相关;微米CT技术构建了储层的孔隙网络模型,认为储层孔隙连通性较差。研究结果对志丹-甘泉地区延长组储层特征与成岩演化序列研究提供了理论依据。
In order to study the reservoir characteristics and diagenetic evolution sequence of Late Triassic in ZhidanGanquan area,the microscopic pore structure of the reservoir was examined by combining indirect measurement techniques such as ordinary mercury injection and constant rate mercury injection with direct observation techniques such as nuclear magnetic resonance and micron CT,with the core and logging analysis in view.The results show that the Late Triassic reservoir in ZhidanGanquan area is dominated by the secondary pores,and the intergranular dissolved pores,intragranular dissolved pores,interstitial dissolved pores and microfractures are developed.Among them,the intragranular dissolved pores are common,the feldspar dissolved pores are mostly accompanied by intragranular the dissolved pores,the interstitial dissolved pores are formed by a small amount of laumontite dissolution,and the microfracture dissolved pores are less developed.The minimum values of the reservoir displacement pressure and median pressure in Zhidan-Ganquan area are determined by ordinary mercury injection,and the mercury saturation value and mercury removal efficiency are quantitatively calculated.The throat distribution characteristics of reservoirs with different permeability could be summarized foom,resulting in the fact that the throat is the main factor determining the seepage rate.The relaxation time of nuclear magnetic resonance T2 spectrum is positively correlated with the porosity of the reservoir.The pore network model of the reservoir is constructed by micron CT technology,and the pore connectivity of the reservoir is proved to be poor.The research results provide a theoretical basis for the study of reservoir characteristics and diagenetic evolution sequence of Yanchang Formation in Zhidan-Ganquan area.
作者
陈玉宝
叶政钦
杨海龙
张创
周雪
铁连军
CHEN Yubao;YE Zhengqin;YANG Haiong;ZHANG Chuang;ZHOU Xue;TIE Lianjun(Yanchang Oilfield Co.,Ltd.,Yan’an 716000,China)
出处
《西安科技大学学报》
CAS
北大核心
2024年第3期521-531,共11页
Journal of Xi’an University of Science and Technology
基金
延长油田科技计划项目(ycsy2023ky-B-04)。
