孤岛馆陶组注水开发储层性质动态变化特征研究

综合利用取心资料、实验室分析化验数据和矿场动态测井资料，研究了孤岛油田低含水期、中高含水期、特高含水期馆陶组砂岩油层岩性、物性、含油性和电性的变化特征。经过长期的注水开发，造成油层泥质含量、碳酸盐含量、含油饱和度和束缚水饱和度降低，平均孔隙直径增大，岩石粒度中值提高，导致渗透率、孔隙度增大。在物性总体增大的同时，孔渗参数的分异度增加；同时，也会由于水敏和速敏的影响使物性变差。声波时差和自然电位、感应电阻率都发生了明显变化，不同岩性的储层参数变化程度有差异，粉砂岩的变化程度小于细砂岩。

Study on the dynamic change feature of reservoir property with injection exploitation in Guantao formation of Gudao oil field

Based on coring information, laboratory test data and dynamic logging information of the formation,the paper elaborated on the changing feature of the lithology, physical property, oil bearing property and electrolysis property for sandstone reservoir in Gudao oil field during low water bearing period,medium water bearing period and high water bearing period respectively. Because of long-term injection exploitation, within the reservoir the clay volume, carbonate content, oil saturation and bound water saturation was reduced, and average pore diameter and rock grain size was increased, which led to an increase of the permeability and porosity. However, with overall growth of physical property, the discrepancy of the parameter for porosity and permeability was raised. At the same time, the physical property became worse due to the water sensitivity and rate sensitivity. Additionally, interval travel, spontaneous potential and induction resistivity changed obviously. There was a difference in change level for reservoir parameter of different lithology. For example, the change level for reservoir parameter of silt is less than that of fine sand.