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Title: Geochemical prediction of volumes and composition of trapped petroleum

Abstract

Predicting the potential volumes and composition of petroleum trapped in a structure or region before drilling is an integral part of petroleum exploration. The authors methodology for such calculations is based on a fundamental understanding of the geologic processes that create commercial accumulations of petroleum. To calculate the mass of petroleum expelled from the mature source rocks that feed a region or structure, the authors used three methods: (1) a mass balance with immature equivalents of the source, which assumes constant organic matter type; (2) an Arrhenius kinetic scheme that related masses of petroleum generated to source rock thermal history; and (3) calibrations between molecular maturity parameters and kerogen to petroleum conversion. Iteration between the three methods gives us the most likely answers for masses of expelled petroleum, source rock thermal history, and organic matter type. By estimating the gas/oil ratio of the expelled petroleum, based on the organic matter type, the authors can calculate the phase relations of the expelled petroleum and, hence, the subsurface volumes of expelled oil and gas. The authors combine a one-dimensional model of the pore-fluid pressure history with the effects of capillary pressure and buoyancy, to predict the direction and range of migration formore » the oil and gas phases. Losses incurred by migrating oil and gas are expressed as a function of the pore volumes through which they can migrate. Hence, by subtracting these losses from the expelled volumes, the authors obtain volume estimates for the oil and gas remaining to be trapped in a structure or region. After evaluating the sealing capacity of the cap rock, the authors compare the volumes of oil and gas remaining with the volume of the structure or structures to calculate their final answer - volume and composition of petroleum trapped.« less

Authors:
;
Publication Date:
Research Org.:
B.P. Research Centre, Subury-on-Thames, England
OSTI Identifier:
5064010
Report Number(s):
CONF-860624-
Journal ID: CODEN: AAPGB
Resource Type:
Conference
Journal Name:
Am. Assoc. Pet. Geol., Bull.; (United States)
Additional Journal Information:
Journal Volume: 70:5; Conference: American Association of Petroleum Geologists annual meeting, Atlanta, GA, USA, 15 Jun 1986
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; PETROLEUM DEPOSITS; EXPLORATION; SOURCE ROCKS; MATURATION; CHEMICAL COMPOSITION; FORECASTING; GEOLOGIC TRAPS; KEROGEN; PETROLEUM; BITUMINOUS MATERIALS; CARBONACEOUS MATERIALS; ENERGY SOURCES; FOSSIL FUELS; FUELS; GEOLOGIC DEPOSITS; MATERIALS; MINERAL RESOURCES; ORGANIC MATTER; RESOURCES; 020200* - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Mackenzie, A S, and Quigley, T M. Geochemical prediction of volumes and composition of trapped petroleum. United States: N. p., 1986. Web.
Mackenzie, A S, & Quigley, T M. Geochemical prediction of volumes and composition of trapped petroleum. United States.
Mackenzie, A S, and Quigley, T M. Thu . "Geochemical prediction of volumes and composition of trapped petroleum". United States.
@article{osti_5064010,
title = {Geochemical prediction of volumes and composition of trapped petroleum},
author = {Mackenzie, A S and Quigley, T M},
abstractNote = {Predicting the potential volumes and composition of petroleum trapped in a structure or region before drilling is an integral part of petroleum exploration. The authors methodology for such calculations is based on a fundamental understanding of the geologic processes that create commercial accumulations of petroleum. To calculate the mass of petroleum expelled from the mature source rocks that feed a region or structure, the authors used three methods: (1) a mass balance with immature equivalents of the source, which assumes constant organic matter type; (2) an Arrhenius kinetic scheme that related masses of petroleum generated to source rock thermal history; and (3) calibrations between molecular maturity parameters and kerogen to petroleum conversion. Iteration between the three methods gives us the most likely answers for masses of expelled petroleum, source rock thermal history, and organic matter type. By estimating the gas/oil ratio of the expelled petroleum, based on the organic matter type, the authors can calculate the phase relations of the expelled petroleum and, hence, the subsurface volumes of expelled oil and gas. The authors combine a one-dimensional model of the pore-fluid pressure history with the effects of capillary pressure and buoyancy, to predict the direction and range of migration for the oil and gas phases. Losses incurred by migrating oil and gas are expressed as a function of the pore volumes through which they can migrate. Hence, by subtracting these losses from the expelled volumes, the authors obtain volume estimates for the oil and gas remaining to be trapped in a structure or region. After evaluating the sealing capacity of the cap rock, the authors compare the volumes of oil and gas remaining with the volume of the structure or structures to calculate their final answer - volume and composition of petroleum trapped.},
doi = {},
journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 70:5,
place = {United States},
year = {1986},
month = {5}
}

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