A quick method to determine subsidence, reservoir compaction, and in-situ stress induced by reservoir depletion

Journal Article · Sun Jan 01 04:00:00 EST 1989 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/17150-PA· OSTI ID:5929461

Morita, N; Whitfill, D L; Nygaard, O; Bale, A

This paper provides a quick method to determine subsidence, compaction, and in-situ stress induced by pore-pressure change. The method is useful for a reservoir whose Young's modulus is less than 20% or greater than 150% of the Young's modulus of the surrounding formation (where the conventional uniaxial strain assumption may not hold). In this work, a parameter study was conducted to find groups of parameters controlling the in-situ stress, subsidence, and compaction. These parameter groups were used to analyze the numerical calculation results generated by a three-dimensional (3D), general, nonlinear, finite-element model (FEM). The procedure and a set of figures showing how to calculate the in-situ stress, subsidence, and compaction induced by pore-pressure changes are provided. Example problems are also included to prevent confusion on sign convention and units. This work showed that Geertsma's results, which are based on no modulus contrast between cap and reservoir rocks, should be extended to simulate more closely real reservoirs, which generally have distinct property differences between the cap and reservoir rocks.

• Research Organization: 9518811; Statoil (NO)
• OSTI ID: 5929461
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 41:1; ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
020300* -- Petroleum-- Drilling & Production
04 OIL SHALES AND TAR SANDS
040201 -- Oil Shales & Tar Sands-- Site Geology-- (-1989)
040401 -- Oil Shales & Tar Sands-- In Situ Methods
True & Modified
42 ENGINEERING
423000 -- Engineering-- Marine Engineering-- (1980-)
ATLANTIC OCEAN
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COMMINUTION
DECOMPOSITION
ENERGY SOURCES
FINITE ELEMENT METHOD
FORMATION DAMAGE
FOSSIL FUELS
FRACTURING
FUELS
HYDRAULIC FRACTURING
IN-SITU PROCESSING
IN-SITU RETORTING
MATERIALS
MECHANICAL PROPERTIES
NORTH SEA
NUMERICAL SOLUTION
OIL SANDS
PARAMETRIC ANALYSIS
PERMEABILITY
POROSITY
PROCESSING
PRODUCTIVITY
RESERVOIR PRESSURE
RESERVOIR ROCK
RETORTING
SEAS
SURFACE WATERS
THREE-DIMENSIONAL CALCULATIONS
WELL CASINGS
YOUNG MODULUS