Analisis Batuan Sedimen-1.pptx

8/18/2019 Analisis Batuan Sedimen-1.pptx

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Origin, classifcation, and occurrence osedimentary rocks

PETROLOGY OFSED!E"T#RY RO$%


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$lassifcation o sed'oggs, (r& )**+


5/23Rono, #& '&, -

Percent o contine0y most im1ortant

rocks as a unction


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2olume 1ercent orocks as a unctio3#ter Rono, #& '


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Tectonic Setting o sediment accumulation


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Tectonic Setting o sediment accumulation


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SL$$L#ST$SED!E"T#RY

RO$%


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Grain Si5e

6dden78ent9ort:scale or sedimen

e


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Grain Si5e #nalysis

Statistical analysis to :o9 is t:e s1read o tsi5e t:roug: t:e sedim

P:i standard deiation

> *&/? 2ery

*&/?to *&?*

*&?to *&@* !oderately

*&@to -&** !oderately

-to )&** Poorly


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# li ti d i if i i d t


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grain si5e and sorting aect

t:e 1orosity and1ermea0ility o sedimentaryrocks

grain;si5e c:aracteristicsreect de1ositionalconditions and 1rocesses

and t:us de1ositionalenironments

#11lication and signifcance o grain;si5e data

Signifcance o orm and roundness


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t:ese 1arameters :ae not 1roen to 0ees1ecially relia0le guides to t:e 1roenanc

and trans1ort :istories o siliciclastic sedims:a1e does :ae an inuence on t:e settlinelocity o 1articles in a uid and t:at de1ao a grain rom a s1:erical s:a1e causes a

decrease in settling elocitys:a1e 3orm4 is kno9n to aect t:etrans1orta0ility o 1articles moing 0y tract

Signifcance o orm and roundness

SE! analysis o grain surace teture


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scanning electron microsco1e 3SE!4 in t:e late -+H*s, t:etec:ni


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Folk 3-+?-4 suggested t:attetural maturity o sandstonesencom1asses t:ree tetural1ro1ertiesJ

3-4 t:e amount o clay;si5esediment in t:e rock

3)4 t:e sorting o t:erame9ork grains, and

3/4 t:e rounding o t:erame9ork grains&

our stages o tetural maturityJimmature, su0mature, mature,and su1ermature

Tetural maturity

Fa0ric


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PackingJ t:e manner o arrangement or s1acing o1articles in a sediment or sedimentary rockK s1ect:e arrangement o clastic grains entirely a1art romaut:igenic grains t:at may :ae crystalli5ed 0et9ee'ates and Mackson, -+.*&

Pandalai and 'asumallick 3-+.A, 1& .@4 suggest t:ais t:e eectie utili5ation o s1ace 0y mutual arrano t:e constituent grains o an aggregate&I

Fa0ric

concerned 9it: t:e 1orosity and 1ermea0ility o sedim9it: c:anges in t:ese 1arameters as a unction o 0ur

and sediment com1action, 1etro1:ysical rock 1ro1ert

Grain Orientation


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Grain Orientation

T:e 1rimary int1article orientation aits 1otential use

1aleocurrent analysa0sence o directional sestructures in a 1article orientatio1roide t:e only

1aleocurrent directioParticle orientation0elieed to :ae ant:e 1ermea0ilisedimentary rocks moement and t:interest to :ydrolo

1etroleum geologists

Porosity and 1ermea0ility


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n terms o origin, 1orosity may 0e eit:er 1rimary 3de1ositional4 or seconda31ostde1ositional4

Primary 1orosity can 0e o t:ree ty1esJ

3-4 intergranular or inter1article 7 1ore s1ace t:at eists 0et9eenrame9ork grains, suc: as siliciclastic 1articles and car0onate graossils, etc&4,

3)4 intragranular or intra1article 7 1ore s1ace 9it:in 1articles, succaities in ossils and o1en s1ace in clay minerals, and

3/4 intercrystalline 7 1ore s1ace 0et9een c:emically ormed crystdolomites&

Secondary 1orosity may include

3-4solution 1orosity caused 0y dissolution o cements or metasta0

rame9ork grains 3elds1ars, rock ragments4 in siliciclastic sedimrocks or dissolution o cements, ossils, rame9ork crystals, etc& incar0onate or ot:er c:emically ormed rocks

3)4intercrystalline 1orosity arising rom 1ore s1ace in cements or ot:er aut:igenic minerals, and

3/4 racture 1orosity, o9ing to racturing o any ty1e o rock 0y teorces or ot:er 1rocesses suc: as com1action and desiccation&

Porosity and 1ermea0ility

Permea0ility


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Permea0ility

Permea0ility isin darcies or 3*&**- darcy4&# darcy is defno 1ermea0ilityto t:e 1assage centimeter o centi1oise iscin one secon

1ressure diereatmos1:ere 1orous mediumarea o cross;ses


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Permea0ility is a com1le unction o1article si5e, sorting, s:a1e, 1acking,and orientation o sediments& T:eeact relations:i1 o 1ermea0ility toeac: o t:ese aria0les is still not

ully understood, and no attem1t ismade :ere to deelo1 a rigoroustreatment o t:ese relations:i1s

Permea0ility


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Analisis Batuan Sedimen-1.pptx

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