摘要
吐哈盆地胜北洼陷七克台组二段致密油勘探开发起步较晚,为了实现七克台组二段致密油规模效益开采,通过岩心、薄片、扫描电镜观察、全岩X衍射、压汞、核磁共振等实验分析手段,研究了该区致密油混积岩储层特征及储层控制因素,建立储层分类评价标准。结果表明:研究区岩石矿物组成复杂,具有明显的混合沉积特征,主要发育陆源碎屑质混积岩、泥质混积岩、碳酸盐质混积岩等3大类6小类;储层整体物性较差,孔隙度主要为4.00%~8.90%,渗透率小于0.100mD的样品占78.8%,属低孔特低渗储层;储集空间类型以晶间孔、粒间孔及微裂缝为主;饱和水核磁共振T2谱多表现为中断的不明显双峰或三峰,排驱压力较高,进汞饱和度和退汞效率较低,整体表现为孔喉半径小、连通性较差;不同岩石类型的物性、含油性与孔隙结构差异明显,以含灰泥质粉砂岩和粉砂质灰岩最好;储层质量受沉积微相、成岩作用、有机质丰度和构造缝等因素的影响。根据储层特征评价将储层分为3类,Ⅰ、Ⅱ类储层是下一步七克台组二段致密油勘探增储上产的关键。研究结果为胜北洼陷七克台组致密油的勘探开发提供了科学依据。
It is delayed for the tight oil exploration and development within the Qiketai Formation Member-2 in the Shengbei Depression of Tuha Basin.In order to gain the efficient development of tight oil resource in the Member-2 of Qiketai Formation,the tight oil diamictite reservoir properties and the corresponding controlling factors were investigated through core test,thin-section analysis,laboratory scanning electron microscope observation,whole-rock C-ray diffraction,mercury intrusion,nuclear magnetic resonance and other test analysis methods.In addition,the corresponding reservoir classification criteria was also established.Result indicates that The rock mineral in this area shows a complex composition with distinct mixed sedimentation.It mainly consists of 3 major categories and 6 sub-categories,including terrigenous clastic diamictite,argillaceous diamictite and carbonate diamictite,tec.The reservoir shows a poor quality integrally,the reservoir porosity is 4.00%~8.90%,the number of core samples with permeability less than 0.100 mD accounts for 78.8%,and it is considered as a low-porosity and ultra-low permeability reservoir.The reservoir space mainly includes intercrystalline pore,intergranular pore and micro-crack.The nuclear magnetic resonance spectrum of saturated water ( T 2) samples are mostly characterized by the insignificant double or triple peak with interruption.The mercury intrusion test shows a higher discharge pressure,lower mercury saturation and mercury removal efficiency,relatively small pore-throat radius and poor connectivity.The physical properties,oil-bearing properties and pore structure of different rock types vary significantly,and it is best for the ashy argillaceous siltstone and silty limestone.The reservoir quality is mainly dependent on the sedimentary micro-facies,diagenesis,organic matter abundance and structural fracture.The reservoir is classified into 3 categories according to the properties,Category-I and Category-II are the major targets for the tight oil exploration and development in the Member-2 of Qiketai Formation.This research could provide certain scientific basis for the tight oil exploration and development in the Qiketai Formation of Shengbei Depression.
作者
冯越
黄志龙
张华
王健
彭亚中
Feng Yue;Huang Zhilong;Zhang Hua;Wang Jian;Peng Yazhong(China University of Petroleum (Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,Beijing 102249,China;PetroChina Tuha Oilfield Company,Hami,Xinjiang 839009,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2019年第5期56-63,共8页
Special Oil & Gas Reservoirs
基金
“十三五”国家科技重大专项“岩性地层油气藏成藏规律、关键技术及目标评价”(2016ZX05001003-006)
关键词
混积岩储层
储层发育特征
七克台组二段
胜北洼陷
吐哈盆地
diamictite reservoir
reservoir properties
Qiketai Formation Member-2
Shengbei Depression
Tuha Basin
作者简介
冯越(1995-),男,2017年毕业于中国石油大学(北京)地质工程专业,现为该校地质资源与地质工程专业在读硕士研究生,主要从事含油气盆地分析研究工作。
