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A Comprehensive Porosity Prediction Model for the Upper Paleozoic Tight Sandstone Reservoir in the Daniudi Gas Field, Ordos Basin

Longwei Qiu, Shengchao Yang, Ningning Xu, Qingsong Gao, Xiangjin Zhang, Xugang Liu, Donghui Wang
School of Geosciences, China University of Petroleum, Qingdao 266580, China

This paper investigated theporosity controlling factors for tight sandstone reservoir in the DaniudiGas field, Ordos Basin based on an intergrated petrographic, petrophsical and geostatistical analyses,and proposed a comprehensive prediction model for reservoir porosity. Compaction was found to be a key factor for causing reservoir densification.The degree of sandstone compaction appears to be affected by grain sizes and sorting. Under normal compaction conditions (e.g. cement content less than 6%, and with no dissolution), the variation in reservoir porosity with burial depth can be well correlated with grain compositions, grain sizes, and sorting. Based on qualitative examination of the controlling factors for reservoir porosities, geostatistics wereused to quantify the effects of various geological parameters on reservoir porosities. A statistical model for comprehensive prediction of porosity was then established, on the assumption that the present reservoir porosity directly relates to both normal compaction and diagenesis.This model is easy to use,and has been validated with measured porosity data. The porosity controlling factors and the comprehensive porosity prediction can be used to quantify effects of the main controlling factors and their interaction on reservoirproperty evolution, and may provide a reference model for log interpretation.

Keywords:tight sandstone reservoir, controlling factors, porosity,Daniudigas field, Ordos Basin

DOI:
10.1007/s12583-016-0935-2
CLC number:
U469.72
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