Heave compensation and formation strength evaluation from downhole acceleration measurements while coring

被引：9

作者：

Guerin, G ^{[1
]}

Goldberg, D ^{[1
]}

机构：

[1] Lamont Doherty Earth Observ, Borehole Res Grp, Palisades, NY 10964 USA

来源：

GEO-MARINE LETTERS | 2002年 / 22卷 / 03期

关键词：

Shear Strength; Sample Analysis; Maximum Acceleration; Ocean Drill Program; Acceleration Data;

D O I：

10.1007/s00367-002-0104-z

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

In order to evaluate the efficiency of heave compensation in the Ocean Drilling Program, we developed a device measuring the acceleration of the core barrels. First results show that heave compensation limits bit motion to 10% of the surface heave. We also use the acceleration data to characterize the formation. On rotary corers, acceleration amplitudes decrease with increasing hardness of the formation. Comparison with geophysical logs shows that this relationship can resolve cm-scale features. On piston corers, the maximum acceleration is characteristic of the sediment shear strength. Easy and fast to deploy, this tool allows to characterize formations before any sample analysis.

引用

页码：133 / 141

页数：9