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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Seismic Modeling of Kerogen Maturity for Source
Rocks: Bakken Shale, Williston Basin, USA
Thermal
maturity of source rock measures the degree to which a formation has been exposed to high heat needed to break down the
organic matter to generate hydrocarbons. The conversion of kerogen to oil/gas will build up overpressure. Overpressure is caused by
conversion of solid kerogen to fluid hydrocarbons in a relatively fixed pore space. The excess pressure caused by kerogen maturity does
have impact on the seismic elastic properties.
Source rock maturity yields oil/gas which develops overpressure (e.g., Meisner, 1978; Luo and Vasseur, 1996). It is important to understand
how the maturity of kerogen will affect the seismic properties that are of interest to geophysicists. Immature source rocks are in the
normal pressured regime and the pressure increases with maturity and over-matured source rocks will be in over-pressured regime. .
The wave propagation, velocities, anisotropy and AVO effects by kerogen maturation
have been obtained as a function of initial kerogen
content (immature), excess pore pressure (mature) for Bakken shale from Williston basin, USA.