petroleum reservoirs
classification of the reservoir rocks
Is tha portion of acontainer that contains the oil and gas found under ground
petroleum reservoirs
consists of two necessary element
categorization of the reservoir rock
Nearly all reservoirs are in unmetamorphased sedimentry displace and most of them in limestones,sandstones,dolomites
categorization of the thing rocks should be simplex and effortless but decisive becouse the petroleum geologist deals with galore categories of
non geologists in the create and should transport his noesis as simple and as cuneate as viable to them
a simpe primary classification of reservoir rocks based largely on
:the origin of the rock divides them into three groups
Chimically or biochemically precipitated reservoir rocks
Fragmental or clastic reservoir rocks
Miscellaneous reservoir rocks
chimical reservoir rocks
The consist of mineral matter that was precipated at the place where the rocks were formed and arent transported
The chief chemical reservoir rock are carbonate sediment mostly limestone and dolomites as pricipitated as crystalline but some time consist of chalk an marl
The main biochimical agents in forming limestones are the algae,bacteria,corain,molluses,bryozoa,brachiopoda,and foraminifera
Limestone and dolomites are the most important of the chimical reservoir rock they contain nearly half of the world petroleum resirvoir
fragmental or clastic reservoir rocks
Fragmental reservoir rocks are aggregate of particales fregments of mineral or fregments of older rocks
They are also cslled clastic rock becouse they consist of mineral and rock particles washed from areas that have been eroded
Particle size of rocks range from colloidal to boulders and pebbles
miscellaneous reservoir rocks
miscellaneous reservoir rocks include the igneous and metamorphic rocks mixtures of both frequeently forming the basement complex the reservoir space is usually in fractures in the brittle basement rocks However these are interesting geologically but rerely important commerically