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Geostatistical modeling for fine reservoir description of Wei2 block of Weicheng oilfield, Dongpu depression, China

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Abstract

The Wei2 block of Weicheng oilfield is characterized by complicated structure mainly caused by high degree of fault development. Multiple reservoir types are found in this block and the reservoir heterogeneity is severe. The oil and gas reservoirs have already stepped into the stagnant stage of a great water-cut degree together with a rapid production decline rate. Thereby, both stabilizing the oil and gas production and optimizing adjustment for further exploitation make it urgent for geomodelers to build a useful model to predict the inter-well parameters and the distribution of the remaining oil and gas. A three-dimensional geological model established with the help of stochastic modeling technique may provide a perfect window and carrier for fine structure interpretation and reservoir heterogeneity description, compared with a traditional two-dimensional model. Hence, based on stratigraphical layering points, significant surfaces and fault points as well seismic interpretation, an integrated structure model is developed. Using the truncated Gaussian simulation and taking the existing geological maps as references, the sedimentary microfacies model was successfully constructed. Through the use of sequential Gaussian simulation method and the facies-controlled modeling method, the reservoir physical properties are populated. Meanwhile, the comparison between facies-controlled and non-facies-controlled property models indicates that the former is more loyal to previous researching and the representation of heterogeneity is ideal. Finally, the ideas of sample density and reserves fitting are proposed to evaluate the practicability and accuracy of the property models.

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Acknowledgments

This paper is supported by the Specialized Research Fund for the Doctoral Program of Higher Education (20110003110014) and Shandong province postdoctoral innovation project special funds (no. 201306069). The authors thank SINOPEC Zhongyuan Petroleum Exploitation Bureau Geoscience Institute for supplying researching data and offering convenience for observing the cores.

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Authors and Affiliations

  1. College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao, 266510, China

    Longlong Liu, Jinliang Zhang, Jinkai Wang, Cunlei Li, Guangxue Zhang, Zhongli Fan, Gaoqun Wei, Zhongqiang Sun, Huanhuan Xue, Tao Yu & Guangqun Wang

  2. Energy Engineering College, Longdong University, Qingyang, 745000, China

    Jiangtao Yu

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  1. Longlong Liu
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  2. Jinliang Zhang
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Correspondence to Jinliang Zhang.

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Liu, L., Zhang, J., Wang, J. et al. Geostatistical modeling for fine reservoir description of Wei2 block of Weicheng oilfield, Dongpu depression, China. Arab J Geosci 8, 9101–9115 (2015). https://doi.org/10.1007/s12517-015-1924-2

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  • DOI: https://doi.org/10.1007/s12517-015-1924-2

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