Hydrothermal Dissolution of Deeply Buried Cambrian Dolomite Rocks and Porosity Generation: Integrated with Geological Studies and Reactive Transport Modeling in the Tarim Basin, ChinaReportar como inadecuado




Hydrothermal Dissolution of Deeply Buried Cambrian Dolomite Rocks and Porosity Generation: Integrated with Geological Studies and Reactive Transport Modeling in the Tarim Basin, China - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Geofluids - Volume 2017 2017, Article ID 9562507, 19 pages - https:-doi.org-10.1155-2017-9562507

Research Article

Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China

Department of Geology, University of Regina, Regina, SK, Canada S4S 0A2

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214151, China

Correspondence should be addressed to Daizhao Chen

Received 12 January 2017; Accepted 20 March 2017; Published 4 May 2017

Academic Editor: Keyu Liu

Copyright © 2017 Wenwen Wei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The burial dissolution of carbonate rocks has long been an interesting topic of reservoir geologists. Integrated with geological studies and reactive transport modeling, this study investigated the Cambrian dolomites that were buried at depths up to 8408 m and still preserved a large amount of unfilled dissolution vugs from the borehole TS1 in the northern Tarim Basin. Studies indicate that these vugs were formed in association with fault-channeled hydrothermal fluids from greater depth through -retrograde dissolution- as the fluid temperature dropped during upward migration. The reactive transport modeling results suggest an important control of the vertical permeability of wall-rock on fluid and temperature patterns which, in turn, would control the spatial distribution of dissolving-originated porosity. The hydrothermal dissolution mainly occurred in dolomite wall-rocks with higher vertical permeability extensive development of tensional fractures and connected pore spaces, producing additional dissolved porosity there during deep burial. This study implicates the importance of multidisciplinary approaches for understanding the burial-hydrothermal dissolution of dolomite rocks and predicting favourable deep-ultradeep carbonate reservoirs.





Autor: Wenwen Wei, Daizhao Chen, Hairuo Qing, and Yixiong Qian

Fuente: https://www.hindawi.com/



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