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Reserve Estimation
Volumetric Reserve estimation involves integration of geological data with reservoir geometry .Recoverable reserve is the volume of hydrocarbon that can be profitably produced from the reservoir. Reserve estimation can be done...
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Oil Discovery in Filicudi prospect
A major announcement has been made by the Lundin Petroleum about oil and gas discovery in the well 7219/12-1. Currently, they are drilling a sidetrack well 7219/12-1A on the Filicudi prospect....
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Log quality control procedure
Log Quality Check:- Quality check of all logs available is first step before starting any interpretation.Given below are the details of basic quality check that should be performed on log.Details...
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Basic Well Planning checklist
Successful well planning needs proper collaboration between geoscientist and engineers.Basic consideration to keep in sight before starting to a well planning:- Target(s) to be evaluated. Drilling method to reach the...
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Hydrocarbon Migration
Hydrocarbon migration stands for the movement of hydrocarbon from source rock to reservoir rocks. In a petroleum system, there are mainly two types of migration 1.Primary Migration: In primary migration process, hydrocarbons are expelled from fine grained source rock into an adjacent permeable carrier bed. . Oil Phase Migration: Most of the hydrocarbons are expelled in liquid state from the source rock . The dynamic process of expulsion of the oil out of the source rock is driven itself by oil generation. The total organic carbon or TOC of Good source rocks range from 3 to 10%. When the TOC is high, then the kerogen is main load-bearing part. With the conversion of organic matter into oil, the load-bearing kerogen will convert into liquid. Most source rocks are carboniferous shales(also called black shales)There will be high fluid pressure of the oil within these carboniferous shales which leads to the formation of micro fractures in the rock. After the formation of micro fractures, the oil is squeezed out followed by collapse of source rock. Such kind of Micro fractures are found in most productive source rocks which are full of remnants of oil. 2.Secondary Migration: Secondary migration is a process of migration which involves the movement of hydrocarbons through fracture network in the source rock to reach reservoir rock. Migration mostly happens for only one or more separate hydrocarbons phases (gas or liquid depending on pressure and temperature conditions). Buoyancy is the key driving force which functions vertically and is proportional to the density difference between water and the hydrocarbon. Hence, migration will be quite stronger for gas as compare to heavier oil.
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Spontaneous Potential Logs
Spontaneous potential (SP) results due to two factors which are 1. salinity difference between formation connate water and mud filtrate (liquid junction potential) 2.Presence of ion selective shale membrane(membrane potential)....
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Resistivity tools
Induction logging tools were designed to work in oil-based drilling mud as laterolog does not works in the absence of conductive medium.In their simplest form induction tools are made of...
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Resistivity logs and its applications
Resistivity of material is an intrinsic property of material which measures how strongly that material opposes the flow of electric current.Its unit is Ohm-meter. The potential difference V between two...
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Mud Logging
Mud logging involves rig-site monitoring , recording and assessment of various type of data related to borehole which comes to surface by drilling process.Mud logging is also called as surface...
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Seismic Data Acquistion
Seismic data acquisition is done on land and in marine environment also.land acquisition mainly needs geophone as receiver and explosives (gelatin dynamite or ammonium nitrate) as source other sources used on land...
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