Oil-bearing property of tight oil reservoir and its influencing factors based on physical simulation experiments
Oil-bearing property is an important and critical parameter in evaluating tight oil reservoirs.In this study,the Cretaceous Xiagou tight argillaceous dolomite reservoir in Qingxi Sag of Jiuxi Depression is selected as an example.The oil-bearing property of tight argillaceous dolomite reservoir and its influencing factors are analyzed based on physical simulation experiments.The results indicate that pore water is replaced with the injection of oil and the increase of driving force,which results in the increase of oil saturation.The evolution of oil saturation increase follows three steps,it slowly increases initially,then quickly increases,and becomes stable finally.The final oil saturation can reach 45.3%-56.8%.Factors of hydrocarbon generation,fluid composition,driving force magnitude and reservoir physical property contribute to the accumulation of tight oil in the Qingxi Sag.The results are expected to provide geological references for favourable area selection.
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维普
