利用模拟井研究用声波成像资料计算裂缝宽度问题  

Calibrating fracture width using Circumferential Borehole Image Logging data from model wells

作　　者：乔德新[1] 李宁[2] 尉中良[1] 朱世和[3] 伍东[3] 

机构地区：[1]中国地质大学(北京) [2]中国石油勘探开发研究院 [3]中国石油辽河石油勘探局

出　　处：《石油勘探与开发》2005年第1期76-79,共4页Petroleum Exploration and Development

摘　　要：介绍利用模拟井研究用井周声波成像测井资料定量计算裂缝宽度的方法。模拟井是根据真实地层的构造特征,采用不同岩性的岩石加工而成的一组试验井,模拟井壁岩性变化和井壁构造现象,以反映井壁复杂的地质特征。通过综合分析模拟井的井周声波成像测井资料,提出了裂缝回波幅度与裂缝宽度的3种关系模型,根据裂缝的视宽度与回波幅度的变化关系,给出了改进后的裂缝宽度计算公式。采用该方法,用模拟井的井周声波成像测井资料计算裂缝宽度,计算结果的平均误差为7％,在模拟井中验证了该定量计算方法的可靠性。该方法在实际应用中取得了很好的效果。Circumferential Borehole Image Logging (CBIL) is discussed based on model wells, which consists of a group of test wells of different rock types to simulate litology variation and structural phenomena of the well wall, and to reflect the complex geological characters of the well wall on the basis of the structural characteristics of real formation. Three models of amplitude echo-fracture width relationships are presented through integrated analysis of CBIL data from model wells and improved computing equation of fracture width is provided according to the relationship between the apparent fracture width and echo amplitude. The fractural width is calculated by using the CBIL data in model wells with the mean absolute error of less than 7%. The reliability of this method is verified in model wells and satisfactory results are obtained also from real-case test.

关 键 词：模拟井 井周声波成像测井 回波幅度 裂缝宽度 定量计算 

分 类 号：TE122.3[石油与天然气工程—油气勘探] TE122.4