气候变化领域集成服务门户(CCPortal): Shale transformations and physical properties—Implications for seismic expression of mobile shales

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DOI	10.1016/j.earscirev.2021.103746
	Shale transformations and physical properties—Implications for seismic expression of mobile shales
	Soto J.I.; Hudec M.R.; Mondol N.H.; Heidari M.
发表日期	2021
ISSN	00128252
卷号	220
英文摘要	Seismic interpretation of mobile shales is challenging, mostly because of their unclear seismic expression. Imaging of mobile shales is difficult because of their low seismic-impedance contrast with many sedimentary rocks, spatial variation of their seismic properties, complex geometries of mobile-shales structures, and their complex internal structures. Furthermore, their seismic properties depend strongly on both overpressure and fluid content, which are difficult to predict. To unravel this problem, we reviewed the physical properties of shales, merging data from in situ determinations of density and sonic velocities with experimental data and modeling results. We analyzed how diagenetic transformations during shale burial modify their physical properties and seismic characteristics. We reviewed conditions for smectite-illite transformation and gas generation (mostly methane) by oil cracking to evaluate how thermal gradient, shale composition, and hydrocarbon content modify the densities, sonic velocities, and seismic expressions of mobile shales. We then incorporated the amount and type of fluids released in shales during diagenesis into a study of seismic reflectivity of mobile shales. Results derived theoretically for various types of mobile-shale contacts are compared with high-quality seismic examples, including mud volcanoes and a variety of complex shale diapirs. Observed reflectivity and seismic fabrics are discussed to infer clay composition, fluid content and type, and temperature. © 2021 Elsevier B.V.
关键词	Clay transformations Hydrocarbons Mobile shales Seismic interpretation Shale diapirs Shale tectonics
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/204139
作者单位	Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, University Station, Box X, Austin, TX 78713-8924, United States; Department of Geosciences, University of Oslo, Oslo, 0316, Norway; Norwegian Geotechnical Institute, Oslo, 0855, Norway
推荐引用方式 GB/T 7714	Soto J.I.,Hudec M.R.,Mondol N.H.,等. Shale transformations and physical properties—Implications for seismic expression of mobile shales[J],2021,220.
APA	Soto J.I.,Hudec M.R.,Mondol N.H.,&Heidari M..(2021).Shale transformations and physical properties—Implications for seismic expression of mobile shales.Earth Science Reviews,220.
MLA	Soto J.I.,et al."Shale transformations and physical properties—Implications for seismic expression of mobile shales".Earth Science Reviews 220(2021).