摘要
鄂尔多斯盆地长7致密油储层具相对高孔低渗特征，孔隙类型复杂，常规的测试技术无法识别和表征储集空间特征。通过对长7致密油储层的核磁共振测试和研究，表明盆地长7致密油储层孔隙孔径分布范围宽，储层中大孔、中孔、小孔、微孔及纳米孔隙类型均发育，且孔径分布范围、孔隙类型和主体孔隙类型受储层致密程度的控制作用明显；长7致密油储层大孔隙至纳米孔孔隙均含油，且微孔至纳米孔隙含油饱满。长7致密油储层微孔、纳米孔孔隙类型的识别及其含油的认识对鄂尔多斯盆地非常规油气资源的勘探与开发具有一定的启示意义。
The Chang7 tight oil reservoirs of Ordos basin have relatively high porosity and low permeability characteristics, with com- plex pore types. Conventional testing techniques can not identify and characterize the spatial characteristics of the reservoirs. NMR tests and studies on tight Chang7 oil reservoirs have shown that the pore size distribution of the tight Chang7 oil reservoirs is with a wide range. Pore types of big, medium, small, micro-pores and nano-pores are all developed in the reservoirs. The pore size distri- bution range, pore type and the main pore types are obviously controlled by the tight degree of the reservoirs; The big- to nano-pores of Chang7 tight oil reservoirs are all oil-bearing, and the micro- to nano-pores are full oily. The identification of pore types and the understanding of the oil-bearing of the micro- to nano-pores in Chang7 tight oil reservoirs have certain significance on the explo- ration and development of unconventional oil and gas resources in the Ordos basin.
基金
中国石油天然气股份有限公司“鄂尔多斯盆地致密油勘探开发关键技术研究”重大科技专项（2011E-2602）项目资助.
关键词
鄂尔多斯盆地
长7油层组
致密油
孔隙特征
核磁共振技术
Ordos basin
Chang7 reservoir group
tight oil reservoir
pore characteristic, s
NMR technique
