Download or read book Subsidence Prediction in New Zealand Geothermal Fields written by R. G. Allis and published by . This book was released on 1998 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modelling of Subsidence in Geothermal Fields written by Wesley Kipng'enoh Koros and published by . This book was released on 2019 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Subsidence is an environmental issue at New Zealand geothermal fields, particularly Wairakei. It has resulted in submissions to geothermal resource consent hearings, subsequent operational consent conditions and long-term monitoring programs. Wairakei geothermal field has a complex subsidence history. It is an example of where withdrawal of geothermal fluid for generation of electricity and the presence of weak and soft highly compressible rocks have caused surface subsidence. For predicting subsidence, there was a need to develop coupled thermal-hydro-mechanical (THM) models. A hierarchy of 1-D, R-Z and 3-D THM models were set up using data and knowledge from the comprehensive investigation programme conducted by Contact Energy Ltd. This subsidence analysis was performed using a coupled approach where two codes (TOUGH2 and ABAQUS) were used to model subsidence. The TOUGH2 code is an established finite volume code that simulates complex multiphase, multi-component subsurface flows. It is used worldwide to model geothermal reservoirs. ABAQUS code is a special general purpose finite element code that can be used to provide solutions to geomechanical problems. It can handle 3-D problems for heterogeneous geological materials together with simple or complex constitutive modelling laws such as those applied in the study carried out here. Pressure and temperature information from the reservoir model over 50 years of production history are interpolated to provide input for the ABAQUS rock mechanics model where subsequent calculation of subsidence takes place. The subsidence model utilised both elastic and nonlinear elasto-plastic deformations and allowed for varied geological strata each characterised by distinct elastic constants and elasto-plastic parameters. Calibration of the reservoir model and geomechanics model was achieved by matching the models output to the measured pressure profiles and subsidence history at a few representative points. Automatic calibration with PEST was used in calibrating the R-Z model. PEST calibration software (Doherty, 2004) was integrated with the TOUGH2 and ABAQUS simulators to carry out a joint inversion of both reservoir and rock mechanics models together, after a reasonably good TOUGH2 model had been obtained. Using parameters determined from field and laboratory measurements together with calibration yielded good subsidence results. The match of the modelled subsidence to the data showed that these models are capable of well representing subsidence that has occurred at Wairakei geothermal field. The subsidence results were compared with measured subsidence in the Wairakei geothermal field and agreed very well for the 1-D and R-Z models. But for the 3-D model, pressures in the shallow zones did not satisfactorily match. This affected prediction of subsidence and therefore the match to the shape of the bowl is qualitatively satisfactory but does not match the magnitude. This study shows that the shape of the subsidence profile over a period of time can be predicted well by using non-linear elastoplastic constitutive model and realistic material properties.
Download or read book Subsidence written by D.J. Reddish and published by Elsevier. This book was released on 2012-12-02 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface subsidence is recognised as a problem in most countries, particularly those with significant mining and other underground resource extraction industries. This book addresses the problems relating to subsidence whether caused naturally, or arising from mining or other forms of underground extractive activity.The main purpose of this book is to bring together subsidence knowledge, experiences and research findings in many countries and rationalise such information especially in respect of its particular field of application. Emphasis has been given to collating field data on subsidence from different countries in order to make direct comparisons. Prediction of subsidence, particularly its occurrence and general characteristics has been seen as an important area where the book can contribute significantly in terms of reviewing available knowledge, methods, scope of application and orders of accuracy achieved. The book also examines methods of controlling subsidence and discusses the response of surface structures to and protection against subsidence.
Download or read book Proceedings of The 20th New Zealand Geothermal Workshop 1998 written by S. F. Simmons and published by . This book was released on 1998 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Analysis of Subsidence Associated with Geothermal Development Handbook written by and published by . This book was released on 1976 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Analysis of Subsidence Associated with Geothermal Development Information bank written by and published by . This book was released on 1976 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subsidence of Cover Sequences at Kawerau Geothermal Field Taupo Volcanic Zone New Zealand written by Scott David Kelly and published by . This book was released on 2015 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determining the Origin of Localised Subsidence Features in the Kawerau Geothermal Field Bay of Plenty New Zealand written by Hayden Thomas Mackenzie and published by . This book was released on 2012 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book National Geothermal Information Resource written by Sidney L. Phillips and published by . This book was released on 1978 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Earthquake Prediction and Rock Mechanics written by WYSS and published by Birkhäuser. This book was released on 2013-11-11 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geothermal Energy Update written by and published by . This book was released on 1978-06 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geothermal Energy Resources and Research written by United States. Congress. Senate. Interior and Insular Affairs and published by . This book was released on 1972 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Subsidence in Sedimentary Basins Due to Groundwater Withdrawal for Geothermal Energy Development written by and published by Utah Geological Survey. This book was released on with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1976 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Rapporteurs' summaries": pages [xxxi]-cxxxii.
Download or read book Land Subsidence Symposium written by and published by . This book was released on 1977 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1986 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Man induced Land Subsidence written by Thomas L. Holzer and published by Geological Society of America. This book was released on 1984 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
