WebInduced porosity can be subdivided into three groups based on the most dominant geological process: (1) Solution porosity: Channels due to the solution of rocks by circulating warm or hot solutions; openings caused by weathering, such as enlarged joints and solution caverns; and voids caused by organisms and later enlarged by solution. (2) WebJan 1, 2024 · Where e: Effective porosity from Neutron-Density lo gs; N: Porosity by Neutron log; D: Porosity by Density Log. The porosity can be calculated by neutron-sonic equa tion [42]:
Detecting vuggy porosity in carbonate reservoirs by well logs
WebJun 24, 2015 · The neutron-porosity log first appeared in 1940. It consisted of an isotopic source, most often plutonium-beryllium, and a single detector. Many variations were produced exploiting both thermal and epithermal neutrons. In most of the early tools, neutrons were not detected directly. WebSep 9, 2015 · Porosity is the volumetric void space in the rock to log analysts the space not occupied by solid material (Figure 1). Without the presence of hydrocarbons, porosity—which is directly related to production potential—and permeability may be of little interest to log analysts. Figure 1. Porosity. chronic swelling in feet
Standard interpretation - AAPG Wiki
WebMay 5, 2015 · Vuggy porosity is a type of porosity in carbonate rocks. This kind of porosity significantly affects the permeability, pressure drop and recovery factor in the reservoir. Therefore, their identification and modeling is important for the reservoir characterization and history matching. Image logs, RCAL and SCAL tests are main tools to determine vugs, … Web1. n. [Formation Evaluation] An indicator of the porosity that does not contribute to a sonic measurement of interval transit time.The transit time is little affected by vugs, fractures and other irregular events because the sonic wave finds a faster path around them. Spherical pores such as oomolds also have less effect on traveltime than oblate pores. . Thus, when … Webporosity can be known by using a combination of at least two of these logs. The lack of these porosity tools makes the determination of porosity difficult. At present, there are … derivative copy and paste