ANALYSIS OF OGOM-1 WELL USING MUD LOGGING EXPLORAT ION TOOL BY Ighrakpata C Fidelia. (M.Sc) 2 , MOLUA,O.Collins(Ph.D) 1 and Igherighe C Edwin (M.Sc) 3 1, Physics Dept. College of Education, Warri 2,3 Physics Dept. College of Education, Agbor Abstract A mud logging process was carried out on OGOM-1 well using its equipment. The well name is a hypothetical one (for security reasons). It is located in delta state and owned by the SPDC. The mud logging formation data was interpreted geologically, revealing their physical parameters such as depths, lithological tops, colour and description. Intervals 8900ft-9910ft of well shows strata of sand and shales, intervals 9910ft-10920ft of well consists mainly of thick columns of sand with occasional intercalation of shale which appears to be slightly sticky. While intervals 10920ft-11920ft of well consists of an alternating sequence of thick shale beds and sand beds. From the lithological analysis obtained, the reservoir could be concluded as a hydrocarbon bearing formation. KEY WORDS : Lithological, Well, Ogom-1, Shales, Sands, Hydrocarbon Mudloging. Introduction Mud logging, also known as hydrocarbon well logging, is the creation of a detailed record (well log) of a borehole by examining the bits of rock or sediment brought to the surface by the circulating drilling medium (most commonly mud). Mud logging is usually performed by a third-party mud logging company. This provides well owners and producers with information about the lithology and fluid content of the borehole while drilling. Historically it is the earliest type of well log. Under some circumstances compressed air is employed as a circulating fluid, rather than mud. Although most commonly used in petroleum exploration, mud logging is also sometimes used when drilling water wells and in other mineral exploration, where drilling fluid is the circulating medium used to lift cuttings out of the hole. In hydrocarbon exploration, hydrocarbon surface gas detectors record the level of natural gas brought up in the mud. A mobile laboratory is situated by the mud logging company near the drilling rig or on deck of an offshore drilling rig, or on a drill ship. Mud logging includes observation and microscopic examination of drill cuttings (formation rock chips), and evaluation of gas hydrocarbon and its constituents, basic chemical and mechanical parameters of drilling fluid or drilling mud (such as chlorides and temperature), as well as compiling other information about the drilling parameters. Then data is plotted on a graphic log called a mud log. Journal of Research and Development, Volume 3 No 1 December 2011 1