致密砂岩储层非均质成因研究

从致密砂岩储层形成过程入手,以分析不同测试化验资料反映的储层差异性为主要方法,开展鄂尔多斯盆地南部红河油田川口条带延长组长8段致密储层非均质成因研究.结果 表明,沉积、成岩和裂缝是致密砂岩非均质性形成的重要因素.沉积作用导致的砂体叠置样式和碎屑颗粒差异形成了宏观非均质性,并且砂体叠置样式对后续成岩作用和裂缝发育有较大的...

A Study on the Cause of Tight Sandstone Reservoir Heterogeneity

Starting from the formation process of tight sandstone reservoir, the main method is to analyse reservoir differences reflected by kinds of test data, the genesis of tight reservoir heterogeneity in Chang 8 Member of Yanchang Section of Chuankou Strip in Honghe Oilfield in the south of Ordos Basin is studied. The superposition of sand bodies and the difference of debris particles caused by sedimentation have formed macro-heterogeneity, and the superposition of sand bodies has a great influence on the subsequent diagenesis and fracture development. The destructive diagenesis formed the basic pattern of reservoir heterogeneity; among them, compaction and calcareous cementation vertically form the characteristics of good physical properties of the middle part of the sand body and poor top and bottom; the overall difference of reservoir quality in the upstream and downstream formed by argillaceous cementation. In the late stage, the dissolution mainly developed in the middle of the sand body, which improved the quality of the reservoir locally and strengthened the heterogeneity of the reservoir. Fractures are mainly developed in thin sandbodies with different superposition patterns, which makes reservoir heterogeneity more complex. According to the drilling verification of Chuankou Strip in Honghe Oilfield, the geological factors at different stages have different effects on reservoir heterogeneity, forming the tight sandstone reservoir heterogeneity distribution.