Characterizing Geometrical Anisotropy of Petrophysical properties in the middle Shahejie formation, Liaohe Depression, China.

Rotimi, Oluwatosin J. and Zhenli, Wang and Afolabi, Richard Oyekunle (2016) Characterizing Geometrical Anisotropy of Petrophysical properties in the middle Shahejie formation, Liaohe Depression, China. International Journal of Applied Environmental Sciences , 11 (1). pp. 89-109. ISSN 0973-6077

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Abstract

Knowledge of reservoir body lateral extent is important information for estimation of hydrocarbon initially in place and the recoverable quantity. This study reports a stepwise approach to evaluate geometrical anisotropy of the rapidly changing alluvial fan Shahejie formation of Eocene age. This is towards understanding reservoir geometry of the deposit beneath the flank of Bohai bay, Northern China. Computation of Sand net to gross (Volume of shale), porosity and permeability was done on well logs as an initial analytical step, followed by computation of sample variograms, data transformation and property modeling. Computation of semivariance was based on first geometrical anisotropy for autocorrelation by finding major and minor directions of data consistency. Autocorrelation of data with distance of location made upscaled data useful for stochastic simulation. Minor data direction is almost perpendicular to the major direction with the bandwidth of not less than 4000. In the vertical direction, average bandwidth is 50. Porosity for the modeled zone is consistent with values between 17% and 35%. Permeability is consistent briefly away from well location but higher in shale units. These oil impregnated shale units are laterally consistent in the up-dip portion but were overtaken by the clastic units in the distal portion. This made draining of hydrocarbon better done in the down-dip portion of the area. An excellent comparative analysis was made of the litho-facies model, petrophysical properties, and inversion results obtained from the vintage seismic. This has yielded a good result in characterizing variation in rock properties of the subtle laterally inconsistent synsedimentary lithofacies of this are

Item Type:	Article
Uncontrolled Keywords:	Petrophysics, Reservoir, Anisotropy, Variogram, Semivariance, Permeability, Alluvial fan, Shale.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	16 Nov 2017 12:11
Last Modified:	16 Nov 2017 12:11
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/9673

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