Quantitative Characterization of Heterogeneity and Geological Modeling of the Yingmai X1 Dolomite Oil Reservoir

doi:10.11885/j.issn.1674-5086.2017.11.08.01

Abstract

Abstract: The Yingmai X1 dolomite oil reservoir has entered the ultra-high water-cut exploitation stage; therefore, it is particularly important to quantitatively characterize the heterogeneity of the reservoir and determine the distribution pattern of residual oil. This study examines the field geologic outcrop, and the results are integrated with characteristics of individual boreholes. We find that the heterogeneity of the Yingmai X1 dolomite oil reservoir is primarily controlled by sedimentation cycles and lithological properties. High-quality reservoirs are mostly located in fine to medium-grained dolomite. Low-permeability bands formed by micritic dolomite influence fluid seepage behavior. The six low-permeability stratigraphic frameworks developed in the reservoir predominantly govern the distribution pattern of the residual oil. By calculating the true thicknesses of stratigraphic layers and using thin-layer inversion techniques, stratigraphic frameworks were constructed and applied as constraints in establishing geological and numerical models for oil reservoirs. It is estimated that the residual oil reserve in the dolomite region amounts to 133.33×10⁴ t and production can reach 22.9×10⁴ t if appropriate measures are introduced. The methodology of this study can be a valuable reference for exploiting similar oil reservoirs.

Key words: dolomite oil reservoirs, reservoir heterogeneity, low-permeability bands, geological modeling, residual oil

CLC Number:

TE122

CAO Peng, DAI Chuanrui, ZHANG Chao, CHANG Shaoying, LIU Jiangli. Quantitative Characterization of Heterogeneity and Geological Modeling of the Yingmai X1 Dolomite Oil Reservoir[J]. 西南石油大学学报(自然科学版), 2019, 41(1): 18-32.

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