MAPPING AND VISUALIZING “DOLOMITE CHIMNEYS”

J. R. WOOD

MICHIGAN TECHNOLOGICAL UNIVERSITY

ORDOVICIAN PRODUCTIONIN MICHIGAN

•CHARACTERIZED BY ELONGATE, LINEAR FIELDS TRENDING NW-SE

•PRIMARY PRODUCTION FROM TRENTON-BLACK RIVER FMS.

•FRACTURING AND SUBSEQUENT SECONDARY DOLOMITIZATION HAVEDEVELOPED IRREGULAR POROSITY ZONES

•MOST FRACTURE ZONES OCCUR ON FLANKS OF MAJOR STRUCTURES TRENDING NORTH OR NORTHWEST

•AVERAGE PAY APPROX. 60 FT.

•FIELDS USUALLY HAVE GAS CAP & SOLUTION GAS DRIVE

SOURCE: OIL & GAS FIELDS SYMPOSIUM, MICHIGAN BASIN GEOLOGICAL SOCIETY

SOURCE: OIL & GAS FIELDS SYMPOSIUM, MICHIGAN BASIN GEOLOGICAL SOCIETY

DEEP RIVER FIELD

DEEP RIVER FIELD

•MIDDLE DEVONIAN DOLOMITES

PRODUCES FROM “ANOMALOUS”SECONDARY DOLOMITE

•5.5 MI. LINEAR TREND - STRIKES•N 60 W, 1/2 MI. WIDE

•ZONE CUTS ACROSS DEEP RIVER DOME

REED CITY & DETROIT RIVERPRODUCTION

DOE PROGRAM:FUNDAMENTAL GEOSCIENCE FOR RESERVOIR CHARACERIZATION

PROJECT TITLE:“ADVANCED CHARACTERIZATION OF FRACTURED RESERVOIRS IN

CARBONATE ROCKS: THE MICHIGAN BASIN”

PRINCIPAL INVESTIGATORS: •JAMES R. WOOD, MICHIGAN TECHNOLOGICAL UNIVERSITY, HOUGHTON, MI

•WILLIAM B. HARRISON, WESTERN MICHIGAN UNIVERSITY, KALAMAZOO, MI.

DOE PROJECT MANAGER: PURNA HALDER

DOE AWARD NUMBER:DE-AC26-98BC15100

NAME AND ADDRESS OF SUBMITTING ORGANIZATION: MICHIGAN TECHNOLOGICAL UNIVERSITY, 1400 TOWNSEND DRIVE, HOUGHTON, MI.

POSSIBLE MODEL FOR MICHIGAN “CHIMNEYS”

POSSIBLE MODEL FOR MICHIGAN

KARSTIFICATION

CONCLUSIONS• KARSTIFICATION & DOLOMITIZATION

ARE PRIMARY PROCESSES IN MICHIGAN RESERVOIRS

• RESERVOIR-SCALE FRACTURES CAN BE RELIABLY MAPPED USING CONVENTIONAL DRILLER’S REPORTS

• GIS SOFTWARE (e.g. ArcView) FACILITATES RE-MAPPING