--> ABSTRACT: Application of a Three-Dimensional Two-Phase Basin Simulator to the Offshore Niigata Basin, Japan, by T. Tokunaga, T. Nishizuka, H. Tosaka, and K. Kojima; #91021 (2010)

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Application of a Three-Dimensional Two-Phase Basin Simulator to the Offshore Niigata Basin, Japan

TOKUNAGA, TOMOCHIKA, TOMOHISA NISHIZUKA, HIROYUKI TOSAKA and KEIJI KOJIMA

A three-dimensional two-phase basin simulator, BASIN3D2P, was applied to the offshore Niigata basin, Japan, where 3 oil/gas fields were found and developed, to make it clear the problems of basin simulation studies for practical exploration activities.

The simulator treats the one-dimensional compaction of sediments, the chemical kinetics of petroleum generation and the maturation of organic material, three-dimensional two-phase fluid flow, and three-dimensional conductive/advective heat flow.

The studied area was about 40 km x 45 km, and was divided into 1,258 grids horizontally, while 10 horizons were deposited sequentially during about 16 m.y. Input data sets for the calculation were prepared by using data from exploration wells, interpreted seismic reflection profiles, results of geochemical measurements, and so on.

The results showed that three-dimensional evolution process of the basin through geological time scale could be simulated by BASIN3D2P, and by modifying heat flow history, relative permeability curves, amount of initial organic materials, and duration of the calculation, we could improve the fitting of the calculated results with the observation. According to our calculation, oil was formed in the kitchen areas mainly from about 6 Ma to 1 Ma, and was expelled and migrated towards presently pooled areas from about 4 Ma to the present.

We, lastly, will discuss possible practical usage of three-dimensional basin simulation to the estimation of oil accumulation in peripheral structures of the developed/depleted oil fields.

AAPG Search and Discovery Article #91021©1997 AAPG Annual Convention, Dallas, Texas.