SEC动态储量评估方法在致密特低渗气田中的应用——以鄂尔多斯盆地大牛地气田为例

Application of SEC dynamic reserves evaluation method in extra-low permeability and tight gas reservoir: A case from Daniudi gasfield,Ordos Basin

SEC动态评估方法是上市储量评估的重要方法之一,在油气田实际运用中存在参数取值多样化、计算结果不一致的问题。SEC动态储量评估法与评估人员所采用的递减方式、对地质条件的认识程度及对生产情况的熟悉程度等有紧密关系。运用一系列与鄂尔多斯盆地大牛地气田的生产开发特点相适应的评估方法,对总结递减规律及优化参数取值具有积极作用。研究中采用剥离新井影响、产量归一化等方法能够客观合理地分析研究大牛地气田的递减规律。综合运用指数递减、双曲递减、调和递减等动态储量递减方法建立单井递减模型计算单井储量,可以用来检验储量评估结果的合理性。

SEC dynamic reserves evaluation is one of the important methods of listed reserves evaluation. In practical application,the parameters and calculation results are various. SEC dynamic reserves evaluation is closely related to evaluation method,understanding of geological conditions and familiarity with production situation of the assessment staff. There are many convenient practical evaluation methods for the SEC reserves evaluation of Daniudi gasfield,the Ordos Basin,and these methods play an important role in summarizing the declining pattern and determining the parameters. The stripping of effects of new wells and normalization of production rate can objectively and rationally reveal the production declining pattern of the Daniudi gasfield; Exponential decline,hyperbolic decline,harmonic decline are integrated to establish single well declining model for the calculation of single well reserves and for verification of the reserves evaluation results.