1
meters 10 0 MWPG MWPG MWPG MWPG MWPG MWPG MWPG Internal Architecture and Sequence Stratigraphy of Middle Mississippian (Visean) Grainstones, Eastern Missouri Eugene C. Rankey RSMAS/University of Miami Purposes Geologic and Stratigraphic Setting This project examined of outcrops of the Middle Mississippian (Visean) Warsaw Shale and Salem Limestone in the area of St. Louis Missouri, with general goals of: 1) developing a preliminary sequence stratigraphic framework for these strata; 2) observing and interpreting the facies of Warsaw-Salem strata; 3) qualitatively describing facies architecture of grainstone bodies; and 4) developing qualitative comparative models for the anatomy and origin of the grainstone shoal complexes of this age. These outcrop analogs should be useful for predicting the characteristics and development of North Caspian hydrocarbon reservoirs. Stratigraphy Missouri Arkansas Illinois Iowa KS ?? ?? N 200 km Study area West flank of Illinois Basin Higher-energy ramp profile Subsurface reservoirs in Illinois Basinward Shallow marine facies on west flank of Illinois Basin Overall shallowing upward trend Progradational facies patterns General “shallowing-upward” parasequences & parasequence sets Parasequence continuity complex Paucity of evidence for subaerial exposure 1 mile 1 km DF CR OWR GV BH GB WT SC RQ I-270 I-44 I-55 MO 61 MO 21 MO 30 MO 141 Meramec River Type Meramecian 4 miles 4 km I-70 I-64 I-44 I-55 MO 141 I-255 Kirkwood Fenton St. Louis St. Charles Arnold N Airport I-270

Salem AAPG2003 panel1 - Miami

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meters

10 0

MW

PG

MW

PG

MW

PG

MW

PG

MW

PG

MW

PG

MW

PG

Inte

rnal

Arc

hite

ctur

e an

d Se

quen

ce S

trat

igra

phy

of M

iddl

e M

issi

ssip

pian

(Vis

ean)

Gra

inst

ones

,Eas

tern

Mis

sour

iE

ugen

e C

. Ran

key

RSM

AS/U

nive

rsity

of M

iam

i

Purp

oses

Geo

logi

c an

d St

ratig

raph

icSe

ttin

g

This

pro

ject

exa

min

ed o

f out

crop

s of t

he M

iddl

e M

issi

ssip

pian

(Vis

ean)

W

arsa

w S

hale

and

Sal

em L

imes

tone

in th

e ar

ea o

f St.

Loui

s Mis

sour

i, w

ith

gene

ral g

oals

of:

1)de

velo

ping

a p

relim

inar

y se

quen

ce st

ratig

raph

icfr

amew

ork

for t

hese

stra

ta;

2)ob

serv

ing

and

inte

rpre

ting

the

faci

es o

f War

saw

-Sal

em st

rata

; 3)

qual

itativ

ely

desc

ribin

g fa

cies

arc

hite

ctur

e of

gra

inst

one

bodi

es; a

nd

4)de

velo

ping

qua

litat

ive

com

para

tive

mod

els f

or th

e an

atom

y an

d or

igin

of t

he

grai

nsto

nesh

oal c

ompl

exes

of t

his a

ge.

Thes

e ou

tcro

p an

alog

s sho

uld

be u

sefu

l for

pre

dict

ing

the

char

acte

ristic

s and

de

velo

pmen

t of N

orth

Cas

pian

hyd

roca

rbon

rese

rvoi

rs.

Stra

tigra

phy

Miss

ouri

Ark

ansa

sIllin

ois

Iow

a

KS

??

??N

200km

Stud

yar

ea

•Wes

t fla

nk o

f Illi

nois

Bas

in•H

ighe

r-en

ergy

ram

p pr

ofile

•Sub

surf

ace

rese

rvoi

rs in

Illin

ois

Bas

inw

ard

•Sha

llow

mar

ine

faci

es o

n w

est f

lank

of

Illin

ois B

asin

•Ove

rall

shal

low

ing

upw

ard

trend

•Pro

grad

atio

nalf

acie

s pat

tern

s

•Gen

eral

“sh

allo

win

g-up

war

d”

para

sequ

ence

s& p

aras

eque

nce

sets

•Par

aseq

uenc

eco

ntin

uity

com

plex

•Pau

city

of e

vide

nce

for s

ubae

rial

expo

sure

1m

ile

1km

DF C

RO

WR

GV

BH

GB

WT

SC

RQ

I-27

0

I-44

I-55

MO

61

MO

21

MO

30

MO

141

MeramecRiver

Type

Meramecian

4m

iles

4km

I-70

I-64

I-44

I-55

MO

141

I-255

Kirk

woo

d

Fent

on

St.L

ouis

St.C

harle

s

Arn

old

N

Airp

ort

I-270