塔巴庙上古储层高角度裂缝测井识别及分布特征研究

Recognition of high angle fractures by logging and study of fracture distribution law in the Tabamiao Upper Paleozoic reservoir,Ordos Basin,China

利用双侧向电阻率和声波测井分析储层中高角度裂缝的测井响应特征,评价裂缝特征参数(裂缝宽度、裂缝孔隙度)的计算方法,并结合实际岩心观察和具体的测试资料,建立适合鄂尔多斯盆地塔巴庙地区上古储层的高角度裂缝测井响应参数场,在此基础上对研究区的高角度裂缝进行精确识别和定量预测,分析和评价了塔巴庙地区裂缝的发育特征和分布规律,认识到塔巴庙地区高角度裂缝在层位上的分布由下至上有变差的趋势,主要集中在山西组第二段和下石盒子组第一段。当计算裂缝宽度大于0.03 mm且裂缝孔隙度大于0.3%时,配合好的储层地质条件,一般都能获得工业产能。

The existence of fractures, particularly high angle fractures, has a decisive meaning to a dense and low permeability reservoir. In this paper, the logging response characteristics high angle fractures are analyzed by dual laterolog resistance and acoustic-wave logging and the method of calculating characteristic parameters （including width, porosity of fractures） are evaluated. Combined with the observation of the core and test data, the parameters to distinguish the high angle fractures in the Tabamiao Upper Paleozoic reservoir are ascertained. Then, on the basis of foregoing cognition, accurate identification and quantitative estimate of high angle fractures are done. At the same time, analyses and evaluation of fractures＇ growth and distribution are also done. Conclusions of the high angle fractures in the Tabamiao Upper Paleozoic reservoir are reached. The distribution of the fractures decrease from low to up and mainly distribute in P1s^2 and P1x^1. When the calculated width and porosity exceed 0. 03 mm and 0. 3% respectively, combined with fine geology conditions of reservoirs, high production capability can be obtained.