English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Phased array compaction cell for measurement of the transversely isotropic elastic properties of compacting sediments Kurt T. Nihei 1 , Seiji Nakagawa 2 , Frederic Reverdy 3 , Larry R. Myer 2 , Luca Duranti 4 , and Greg Ball 4 ABSTRACT Sediments undergoing compaction exhibit transversely isotropic (TI) elastic properties that are described by five elastic constants. Continuous determination of all five constants in the laboratory during compaction is a difficult task. In this paper, we present a new experimental apparatus, the phased array compaction cell, for measuring the TI elastic properties of clay-rich sediments under uniaxial strain consolidation conditions. This apparatus uses matched sets of P- and S-wave ultrasonic transducers located along the sides of the sample and an ultrasonic P-wave phased array source together with a miniature P-wave receiver on the top and bottom ends of the sample. The phased array provides plane P-waves that are used to measure phase velocities over a range of angles. From these measurements, the five TI elastic constants can be recovered as the sediment is compacted, without the need for sample unloading, re-coring, or reorienting. Descriptions of the apparatus, data processing and an application demonstrating recovery of the evolving TI properties of a compacting marine sediment sample are provided in this paper. Formerly Lawrence Berkeley National Laboratory, California, U.S.A.; presently Chevron ETC, California, U.S.A. Email: knih@chevron.com. Lawrence Berkeley National Laboratory, California, U.S.A. Email: snakagawa@lbl.gov. Formerly Lawrence Berkeley National Laboratory, California, U.S.A.; presently CEA, Gif sur Yvette, France. Email: frederic.reverdy@cea.fr. Chevron ETC, California, U.S.A. Email: ludu@chevron.com; bagj@chevron.com. INTRODUCTION Anisotropy in the overlying reservoir strata, when left uncorrected for, can detrimentally affect efforts to image reservoir structure and estimate reservoir properties using seismic methods. While clay-rich rocks often constitute the major fraction of sedimentary basins, only a