摘要
通过对鄂尔多斯盆地沉积盖层露头区和探井岩心裂缝或节理的大量观测,以及对部分裂缝测井资料的分析,认为沉积盖层中构造裂缝较为发育。按产状将其分为直立或陡倾裂缝、倾斜裂缝、水平裂缝3种类型,但不同层系皆以直立或陡倾裂缝为主,且不同地区具有不同的裂缝系统。裂缝常成对出现,组成平面X型共轭剪节理系,其中一组常具压剪性质,而另一组多具张剪性质。先期区域性水平挤压作用和后期区域性不对称水平剪切(或力偶)作用是其形成的力学条件,形成的地球动力学背景是特提斯构造动力体系与滨太平洋构造动力体系的强弱交替联合作用。沉积盖层构造裂缝研究对于鄂尔多斯盆地的油气聚集及其低孔低渗-特低渗油气层的勘探与开发具有重要的意义。
Through the observation of a large number of fractures and joints in the outcrops of sedimentary strata and in the cores of exploration wells in E'erduosi Basin, and the analysis of partial fracture log data of the basin, it was considered that the fractures are relatively developed in the sedimentary strata. According to occurrence, these fractures might be divided into three types, i. e. vertical or steep fractures, inclined fractures and horizontal fractures. The fractures in some strata are mainly the vertical or steep fractures, and different fracture systems exist in distinct areas. The fractures usually appear in pairs and constitute a plane X conjugate shear joint system, in which one group is often possessed of compresso-shear property and the other tensoshear property. The initial regional horizontal compressional function and late regional asymmetrical horizontal shear (or couple) action were the mechanical conditions of their being formed, and the strong-weak alterating joint action of Tethyan tectonic dynamical system and circum-Pacific tectonic dynamical system was the geodynamical background of their being formed. Therefore the research on structural fractures of sedimentary strata is of great importance to the oil and gas accumulation in E'erduosi Basin and the exploration and development of the low porosity and low-ultrolow permeability reservoirs in the basin.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第7期14-16,共3页
Natural Gas Industry
基金
本文为国家"973"项目(2003CB214601)国家"973"预研项目(2002CCC01400)研究成果
