摘要
采用电子探针、阴极发光、二维核磁共振和激光共聚焦等表征方法,从岩石学特征、含油性和原油组分赋存状态等方面,分析松辽盆地青山口组一段泥页岩中微晶碳酸盐岩的微观特征、油气组分微观赋存状态及二者之间的关系。结果表明:构成微晶碳酸盐岩的矿物为自形程度较高的微晶(30~40μm)方解石矿物组成,孔隙空间以晶间孔为主,原油占岩石体积的15.7%,平均配位数为1.11,均质因数为0.36。储层中油气占总流体体积的29.05%,且原油的不同组分在孔隙中分布发生分异,重质组分主要吸附在岩石矿物晶体表面,少部分游离分布于孔隙喉道,而轻质组分主要以游离态分布在孔腔内部及碳酸盐晶粒外部。微晶碳酸盐岩虽具有显著的页岩油气贮存能力,但重质组分导致孔喉堵塞而不利于工业开采。该结果指出松辽盆地青一段微晶碳酸盐岩微观特征与原油组分赋存状态差异性,为泥页岩的开采工艺改进提供基础数据支撑。
This paper uses the characterization methods by combining electron probe,cathodoluminescence,two-dimensional nuclear magnetic resonance and laser confocal to study the microcosmic characteristics and the microcosmic state of oil and gas composition of microcrystalline carbonate of the first member of Qingshankou Formation in Songliao Basin,and the relationship between them from the petrological characteristics,oil bearing and occurrence state of crude oil components,and so on.The results show that the minerals of microcrystalline carbonate are composed of calcalite minerals with high degree of self-formation(30~40 m),the pore space is dominated by"intercrystalline boles",the content of oil occupies 15.7%of the rock volume,the average coordination position is 1.11,and the mean factor is 0.36.The oil and gas in the reservoir accounts for 29.05%of the fluid,and the distribution of different components of crude oil varies in the pores.The heavy components are mainly adsorbed on the surface of rock and mineral crystals,a small part is distributed in the pore throat,while the light components are mainly distributed in the pore cavity and outside the carbonate grains in a free state.Although microcrystalline carbonate rocks have remarkable shale oil and gas storage capacity,they are not conducive to industrial exploitation due to the blockage of pore throat caused by heavy components.Therefore,this paper studies the microscopic characteristics of microcrystalline carbonate rocks in Qing 1 st Member section of Songliao Basin and the law of the difference in the occurrence state of crude oil components.This result is to provide basic data support for the improvement of shale mining technology.
作者
周华建
孙先达
柳波
罗晓容
申家年
邢济麟
ZHOU Huajian;SUN Xianda;LIU Bo;LUO Xiaorong;SHEN Jianian;XING Jilin(Institute of Unconventional Oil and Gas,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Exploration and Development Institute,JUin Oilfield Company of PetroChina,Songyuan,JUin 138000,China)
出处
《东北石油大学学报》
CAS
北大核心
2020年第5期13-22,I0001,I0002,共12页
Journal of Northeast Petroleum University
基金
黑龙江省博士后科研启动金资助项目(LBH-Q18028)。
关键词
松辽盆地
青一段
微晶碳酸盐岩
储层特征
含油性
原油组分赋存状态
Qing 1st Member
Songliao Basin
microcrystalline carbonate rock
microscopic characteristics of reservoir
oil saturation
occurrence state of crude oil components
