文档介绍：文章编号:0253-2697(2013)01-
鄂尔多斯盆地致密油、页岩油特征及资源潜力
杨华1,2 李士祥2,3 刘显阳2,3
(1. 中国石油长庆油田公司陕西西安 710018;2. 低渗透油气田勘探开发国家工程实验室陕西西安 710018;
3. 中国石油长庆油田公司勘探开发研究院陕西西安 710018)
摘要:~1mD的超低渗透油藏已实现了规模有效开发。考虑到鄂尔多斯盆地石油勘探开发实际,,赋存于油页岩及其互层共生的致密砂岩储层中,石油未经过大规模长距离运移的油藏称为致密油,包括致密砂岩油藏和页岩油藏2大类。延长组致密油主要发育于半深湖—深湖相区,以延长组7段(简称长7)油层组油页岩、致密砂岩和湖盆中部的延长组6段(简称长6)油层组致密砂岩最为典型。致密油具有分布范围广,烃源岩条件优越,砂岩储层致密,孔喉结构复杂,物性差,含油饱和度高,原油性质好,油藏压力系数低的特点。纳米级孔喉系统广泛发育是致密油储集体连续油气聚集的根本特征,延长组致密砂岩储层中大多连通的孔喉直径大于临界孔喉直径,满足油气在致密储层中运移的条件。根据致密油层与生油岩层的接触关系,确定了3种致密油储集层类型:①致密块状砂岩储层;②砂岩-泥岩互层型储层;③油页岩型致密储层。鄂尔多斯盆地长6和长7油层组致密油分布广泛,初步预测致密油总资源量约30×108 t,其中长7油层组页岩油资源量超过10×108 t,长7油层组致密砂岩油资源量约9×108 t,长6油层组致密砂岩油资源量约11×108 t。致密油资源是长庆油田实现年产油气当量5000×104 t并长期稳产较为现实的石油接替资源。
关键词:致密砂岩油;致密页岩油;致密油;致密油储层;资源潜力;延长组;鄂尔多斯盆地
中图分类号: 文献标识码:A
Characteristics and resource prospects of tight oil and shale oil in Ordos Basin
Yang Hua1,2 Li Shixiang2,3 Liu Xianyang2,3
(1. PetroChina Changqing pany, Xi’an 710018, China; 2. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi’an 710018, China; 3. Research Institute of Exploration and Development, PetroChina Changqing pany, Xi’an 710018, China)
Abstract: Changqing pany has been realized efficient and scale development of the super low permeability reservoir which permeability is situated between and 1mD. Considering the petroleum exploration and development practice of Ordos Basin, the tight oil refers to air permeability of reservoir less than , and an oil that accumulates in oil shale and tight sandstones interbedded with or adjacent to source rocks. Generally, this oil accumulation has not yet experienced a large-scale, long-distance migration. The tight oil include tight sandstone oil reservoir and tight shale oil reservoir. The tight oil of Yanchang Formation is mainly developed in the half deep lacustrine to deep lacustrine zone, for the typical to oil shale and tight sandstone of Chang 7 interval, tight sandstone