Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Forced Fold Amplitude and Sill Thickness Constrained by Wireline and 3-D Seismic Data Suggest an Elastic Magma-Induced Deformation in Tarim Basin, NW China

Version 1 : Received: 30 November 2020 / Approved: 1 December 2020 / Online: 1 December 2020 (10:12:23 CET)

A peer-reviewed article of this Preprint also exists.

Tian, W.; Li, X.; Wang, L. Forced Fold Amplitude and Sill Thickness Constrained by Wireline and 3-D Seismic Data Suggest an Elastic Magma-Induced Deformation in Tarim Basin, NW China. Minerals 2021, 11, 293. Tian, W.; Li, X.; Wang, L. Forced Fold Amplitude and Sill Thickness Constrained by Wireline and 3-D Seismic Data Suggest an Elastic Magma-Induced Deformation in Tarim Basin, NW China. Minerals 2021, 11, 293.

Journal reference: Minerals 2021, 11, 293
DOI: 10.3390/min11030293

Abstract

Disparities between fold amplitude (A) and intrusion thickness (Hsill) are critical in identifying elastic or inelastic deformation in a forced fold. However, accurate measurement of these two parameters is challenging because of the limit in separability and detectability for the seismic data. In the TZ-47 exploring area from the Tarim Basin, Northwest China, we combined wireline data and 3-D seismic data, to accurately constrain the fold amplitude and total thickness of sills that inducing the roof uplift. The measurement results show that the forced fold amplitude is 155 m and the total sill thickness is 148.4 m. When using a magma density of 2.7 g/cm3, and solid rock density of 3 g/cm3, the molten magma thickness at the time of intrusion would be 153.8 m, which is almost no difference from the forced fold amplitude. Therefore, the TZ-47 fold is a pure elastic forced fold induced by emplacement of multiple sills. Measurement solely based on seismic data may not be able to detect some thin interlayers and may result in large errors.

Subject Areas

forced fold; elastic; inelastic; saucer-shaped sill; wireline data; seismic cube; velocity pull up; Tarim flood basalt

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