Topic
Effective porosity
About: Effective porosity is a research topic. Over the lifetime, 1199 publications have been published within this topic receiving 26511 citations.
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TL;DR: The magnetotelluric (MT) sounding method has been employed to study the deep aquifer of Senegal and the results from nine soundings measured along a 350 km long east-west profile demonstrate that the method provides valuable information about the geometry on the bottom of the Maestrichtian aquifer and that it can be used as a tool for estimating the effective porosity of the aquifer as mentioned in this paper.
14 citations
TL;DR: In this article, the key laboratory for mechanics in fluid solid coupling systems was used to study fluid solid couplings systems in the Chinese National Museum of Natural Resources and Life Sciences (CNRL).
Abstract: Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China University of Natural Resources and Life Sciences, Vienna, Austria Qingdao Institute of Marine Geology, Qingdao, China State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China State Key laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
14 citations
TL;DR: In this article, the authors used the radioactive tracer technique for the determination of the effective porosity of a ground water-bearing formation in the Wadi El-Natrun area in the U.S.A.
14 citations
Patent•
28 Sep 1987TL;DR: In this paper, the authors measured the intensity of fluorescence generated by bombarding the impregnated thin section with sufficiently energetic X-rays and rationing that intensity to the intensity generated by subjecting a sample containing only epoxy to the same conditions.
Abstract: Total porosity of impregnated thin sections can be measured using X-ray fluorescence. The technique requires an impregnating fluid which contains an element not contained in more than trace quantities by the rock. By measuring the intensity of fluorescence generated by bombarding the impregnated thin section with sufficiently energetic X-rays and rationing that intensity to the intensity of fluorescence generated by subjecting a sample containing only epoxy to the same conditions, and scaling the resulting measures of fluorescence, a measure of total effective porosity is produced.
14 citations
01 Jan 1979
TL;DR: Secondary leached porosity is in the form of leached feldspar grains, volcanic rock fragments, carbonate cements, and carbonate-replaced grains as discussed by the authors.
Abstract: Secondary leached porosity is common to dominant in near surface to deep subsurface lower Tertiary sandstone reservoirs along the Texas Gulf Coast. This secondary porosity is in the form of leached feldspar grains, volcanic rock fragments, carbonate cements, and carbonate-replaced grains. Leached porosity occurs in sandstones with compositions ranging from volcanic litharenite and lithic arkose to quartzose sublitharenite and quartzose subarkose. A generalized diagenetic sequence indicates that leaching is a multi-staged phenomenon occurring at or near surface, at burial depths of 4000 to 6000 ft, and at burial depths of 7000 to 10,000 ft. Feldspar grains are dissolved during the first stage, whereas grains, cements, and replacement products are dissolved during the last two stages. Intensity of leaching in each stage varies in different formations and in different areas. Plots of secondary porosity as a percent of total porosity versus burial depth show that secondary porosity is dominant beneath 10,000 ft, ranging from 50 to 100 percent of total porosity. Above 10,000 ft more than half the samples have secondary porosity as the dominant type. Similarly, individual plots for the Wilcox, Yegua, Vicksburgs, and Frio sandstones all demonstrate the predominance of secondary leached porosity. Primary porosity is destroyed by compaction and cementation with increasing depth of burial. If this were the only porosity type, no deep, high-quality reservoirs would exist. Leaching, however, restores reservoir quality after primary porosity has been reduced. Most productive lower Tertiary sandstone reservoirs, especially deep reservoirs, along the Texas Gulf Coast exist only because of secondary leached porosity.
14 citations