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柴达木盆地东部地区第四系生物气藏储盖层目前仍处于成岩初期,为了对其进行定量评价,综合考虑储盖层岩性、物性及含气性基础上,选取排替压力、泥质含量、孔隙度和含气饱和度作为评价参数,并建立了各参数的测井计算模型,提出了储盖层有效性的多参数综合评价方法,给出了储盖层评价标准。采用该方法对研究区涩北一号、涩北二号、台南、台吉乃尔、盐湖等5个气田储盖组合有效性进行评价,评价结果与生物气分布吻合,证明评价方法有效。
In the early stage of diagenesis, Quaternary biogas reservoirs in the eastern Qaidam basin are still in the early stage of diagenesis. In order to quantitatively evaluate them, considering the lithology, physical properties and gas-bearing property of reservoirs, the replacement pressure, mud Porosity, and gas saturation as evaluation parameters, and log calculation models for each parameter are established. A multi-parameter comprehensive evaluation method of reservoir validity is proposed, and the evaluation criteria of reservoir caprock is given. This method was used to evaluate the effectiveness of reservoir-cap combination of five gas fields in Sebei 1, Sebei 2, Tainan, Tajukil, and Salt Lake in the study area. The evaluation results are in good agreement with the biogas distribution, which proves that the evaluation method is effective.