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首页> 外文期刊>Natural Gas Industry B >Reservoir effectiveness evaluation based on comprehensive reservoir quality evaluation indexes of well logging: A case study on the Permian Qixia Fm in the western Sichuan Basin
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Reservoir effectiveness evaluation based on comprehensive reservoir quality evaluation indexes of well logging: A case study on the Permian Qixia Fm in the western Sichuan Basin

机译：基于测井综合储层质量评价指标的储层有效性评价-以川西盆地二叠系栖霞组为例

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In the western Sichuan Basin, the Permian Qixia Fm grained dolomite reservoirs are currently the new focus of natural gas exploration and development. The Qixia Fm is characterized by developed dissolved vugs and fractures, low matrix porosity and strong heterogeneity, so evaluation faults tend to occur if reservoir effectiveness is evaluated by means of the traditional porosity evaluation, and the consequently the predicted gas well productivity is more deviated from the actual measurement. In this paper, the characteristics of Qixia Fm reservoirs in this area were firstly analyzed. Then, the method and criterion of the effectiveness evaluation of Qixia Fm reservoirs in the western Sichuan Basin were established by means of numerical simulation and special logging data processing. And the following research results were obtained. First, surface porosity of matrix pores and secondary dissolved vugs calculated based on the special processing of conventional logging and electric imaging logging can be used to evaluate the reservoir properties of reservoirs. Second, deep and shallow dual lateral logging in combination with electric imaging logging and Stoneley wave energy data can be used to evaluate the filtration capacity of reservoirs. Third, the criterion of effective Qixia Fm reservoirs is established, including storage coefficient ≥0.6, deep lateral resistivity <5000?Ω·m, surface porosity >0.6%, Stoneley wave attenuation ≥10% and comprehensive reservoir evaluation index ≥0.25, and the evaluation criterion can well characterize reservoir quality and gas well productivity. The field application results of this evaluation method and evaluation criterion indicate that the coincidence rate of reservoir effectiveness has increased from 70% to over 90%. Thus, the technical difficulties related to the heterogeneous carbonate reservoir effectiveness evaluation are basically solved. Besides, they provide a basis for the determination of production test layer selection, completion engineering and development scheme so as to cut down the natural gas exploration and development cost.
机译：在四川盆地西部，二叠系栖霞组颗粒状白云岩储层目前是天然气勘探开发的新重点。栖霞组的特征是溶洞和裂缝发育，基质孔隙度低，非均质性强，如果采用传统的孔隙度评价方法进行储层有效性评价，往往会出现评价失误，从而导致预测气井产能更偏离实际测量。本文首先对该地区栖霞组储层特征进行了分析。然后，通过数值模拟和专门的测井资料处理，建立了川西盆地栖霞组储层有效性评价的方法和标准。并获得了以下研究结果。首先，基于常规测井和电成像测井的特殊处理计算出的基质孔隙和二次溶质孔隙的表面孔隙度可用于评估储层的储层性质。第二，结合电成像测井和斯通利波能数据的深，浅层横向测井可以用来评价储层的过滤能力。第三，建立了栖霞组有效储层判据，储层系数≥0.6，深层侧向电阻率<5000？Ω·m，地表孔隙度> 0.6％，斯通利波衰减≥10％，综合评价指标≥0.25，评价标准可以很好地描述储层质量和气井产能。该评价方法和评价标准的现场应用结果表明，储层有效性的符合率从70％提高到90％以上。因此，基本上解决了与非均质碳酸盐岩储层有效性评价有关的技术难题。此外，它们为确定生产测试层的选择，完井工程和开发方案提供了依据，从而降低了天然气勘探开发成本。

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