Well Logging

Nicely Logging

One of many main purposes of nicely logging is for the placement of petroleum sources. The nicely logging strategies are getting used to complement the information gained from different strategies reminiscent of core evaluation, cuttings, and aspect wall samples.The Hydrocarbons are extra resistive than an adjoining water zone. {Most electrical} measurements may be made even when the nicely isn’t cased. If the deep resistivity is excessive, it may be a sign that the hydrocarbons are current. If the deep resistivity is relatively decrease, it does point out the presence of rocks reminiscent of shale or moist sand. Resistivity is measured in ohm-meters.The spontaneous or self potential logging includes the measurement of naturally occurring electrical potential distinction within the earth. The self potential curve is a steady recording of the info with respect to depth. It reveals {the electrical} potential distinction between a movable electrode within the nicely and a hard and fast electrode on the floor. An electrode is lowered down the nicely, and {an electrical} potential is measured at a number of areas within the nicely with respect to that of the mounted electrode on the floor. Logging charge is about 1.5 kilometers per hour. The required instruments are: electrodes, a galvanometer, and a small battery.In induction logging methodology, the sensing half does include an array of transmitter and receiver coils. The transmitter coils are energised with an alternating present which does outcome within the technology of an electromagnetic area within the formations inside the nicely. The receiver coils that are positioned between 12 to 40 inches from the transmitter coils, can sense or register the entire resultant area. The full resultant area is the sum of the first area which is produced by the transmitter and the secondary area which is produced by the interplay of the first area with the encompassing rock formations. The secondary area needs to be analysed for its amplitude and the part traits. The evaluation can be utilized to derive the values of the resistivity and the magnetic susceptibility of the lithological formations. The induction logging does really measure the conductivity of the formations, and therefore can be referred to as because the conductivity logging methodology.Gamma-ray logs are also referred to as the shale logs. This methodology does measure the naturally occurring gamma radiation. Shales normally do emit extra gamma rays than the opposite varieties of sedimentary rocks reminiscent of sandstone, limestone, and so forth. The radioactive potassium is a standard element within the shales. Thus the gamma-ray logging does facilitate to differentiate between shales and non-shales.The lithology may be recognized from the lithology logs. The deflection to the fitting aspect on each gamma-ray logs and self potential logs does point out the presence of shale. The deflection to the left on each the logs does point out the presence of sand.The porosity logs may facilitate for the identification of porous and non-porous formations. The deflections in the direction of the left aspect on the log may be a sign of the presence of extra porous rocks. The deflections to the fitting aspect, is usually a signal for the presence of much less porous formations.