... water resistivity which requires the Static Spontaneous Potential (SSP) computed from the SP. In order to correct these effects, many correction charts have been created. However, in very complicated logging environments, the charts cannot completely correct the mentioned effects. So, more useful...

.... Doll, discovered the spontaneous potential (SP) log, typically used to broadly classify rocks as permeable or impermeable. Quantitatively speaking, the SP log finds one relevant application in the estimation of formation water resistivity based on Nernst's equation: = K log Rmf , Rw (1) where...

... log analysis calculation salinity well logging SP measurement static sp measurement tool Schlumberger potential difference principle application mud resistivity permeable formation diffusion potential vertical resolution SSPT Upstream Oil & Gas spwla 50 log principle...

... SPE Members Abstract A new method is presented to determine formation water resistivity (R w) in sandstones. This procedure does not use the Spontaneous Potential (SP) log. Instead formation R w is Potential (SP) log. Instead formation R w is obtained from the overlying shale zones...

.... On some specialized services such as the Microlog or Dipmeter an expanded depth scale of 25 in. =100 ft or 60 in. = 100 ft is frequently used. In very rare cases the expanded scale of 120 in. = 100 ft can be recorded. The Spontaneous Potential Curve The SP log (spontaneous or self-potential log...

... ABSTRACT Formation water resistivity (Rw) is one of the most important parameters in log interpretation. Spontaneous potential or SP logs have been used in Rw calculation, which is especially effective in clean sand. However, when the sand contains clay, the clay interferes with the ion...

...) data, formation water analysis and conventional well logging data, the distribution area of surface water invasion reservoirs were captured. The difference of the spontaneous potential (SP) and natural gamma ray (GR) log response between such type of formation with common reservoir was extracted...

... Abstract Spontaneous Potential (SP) and Gamma Ray (GR) logs are often the only measurements available in many old hydrocarbon fields. Reliable coupled petrophysical interpretation of GR and SP logs requires previous accurate quantitative calibration for the effects of shale laminations, water...

... conventional sp analysis SPE Society of Petroleum Engineers SPE 17516 Water Resistivity From Spontaneous Potential Logs in the Minnelusa Formation, Powder River Basin, Wyoming by B.A. Policky, Marathon Oil Co., and W.P. Iverson, U. of Wyoming SPE Members Copyright 1988 Society of Petroleum Engineers...

... resiativity ohm/meter K&o: invaded zone resistivity ohm/meter Sl+ spontaneous potential (mV) SP.O,:deconvolved SP (mV) SP,.C:reconstructed SP (mV) SSl? static spontaneous potential (mV) SW: water saturation 12 SPWLA lknty-Eighth Annual Logging Symposium, June 29-July 2, 1987 References [1] Log Interpretation...

... steady production. Spontaneous Current Log CSCL) and Improved Spontaneous Potential Log CISPL) are new logg!ilg methods which~ ar·e developed on the basis of conventional SP log. n-,ese methods can be used to effectively distinguish thin beds and determine their flooded state. The SCL and ISPL...

... that we used are resistivity, spontaneous potential (SP), elements from nuclear spectroscopy, bulk density, neutron, NMR and, of course, Core_Swt to compare to. The plot at the end of the abstract shows our goal: compare core Sw to log derived Sw_surface so that one compares both log and core at the same...

... in porosity and water saturation in the pay zones. The porosity and water saturation in the pay zones. The correlations of the Spontaneous Potential (SP), Gamma ray and resistivity traces of wells from the West Sak field are used to determine lateral and vertical gradients of the lithofacies of various...

... wells are drilled by local production institutes called Neft, for the purpose of developing and producing delineated fields. Most research wells are evaluated with open hole logs such as spontaneous potential (SP), a combination of lateral and normal resistivities, conductivity, microlog, caliper...

... is often unknown. Several log-based techniques can be used to estimate the water resistivity, which can be used to calculate the equivalent formation water salinity, such as the Pickett's plot technique or spontaneous potential (SP log) but remain subjected to some uncertainties. Although captured down...

... and with suitable interpolation for uncatalogued formations. Spontaneous potential (SP) logs for each well are examined by the computer to determine the tops and bottoms of each sand of interest. The recorded SP values are corrected for the effects of bed thicknesses, formation re- sistivities and depth of invasion...