鄂尔多斯盆地镇北地区长3储层微观非均质性的实验分析

Experimental Analysis on Micro-anisotropy of Chang 3 Reservoirs in Zhenbei Area,Ordos Basin

油气储层的微观非均质性特征是储层地质学研究的重要内容之一。本文的目的是研究鄂尔多斯盆地镇北地区长3储层微观非均质性特征,研究方法是利用真实砂岩微观模型实验。通过实验发现鄂尔多斯盆地镇北地区长3和储层为致密型砂岩,真实砂岩微观模型实验直观地显示出鄂尔多斯盆地镇北地区长3储层具有很强的微观非均质性,砂岩的成岩作用和孔隙结构是影响本区长3储层微观非均质性的主要原因。在低渗透砂岩中,溶蚀作用引起砂岩产生强烈的非均质性,而这些砂岩则形成长3储层的高渗带。

The micro-anisotropy characteristics of the oil and gas reservoirs are one of the important contents in reservoir geology. Based on the authentic sandstone micro-model experiment, the micro-anisotropy characteristic of Chang 3 reservoirs of Zhenbei area in Ordos Basin was analyzed. Chang 3 reservoirs belong to tight sandstone. The authentic sandstone micro-model experiment audio-visually display the intense micro-anisotropy of Chang 3 reservoirs in this area. The sandstone pore structure and diagenesis are main factors influencing Chang 3 reservoirs micro-anisotropy. The dissolution resulted in the intense micro-anistropy of Chang 3 low permeable sandstone, but this sandstone formed high permeable zone of Chang 3 reservoirs in this area.