微地震是评价致密砂岩裂缝性油气藏缝网压裂裂缝形态及几何尺寸的有效方法和手段,但其适用条件受限,且成本较高。为此,需要一种快速的、经济适用的方法来评价缝网压裂裂缝复杂程度。基于压裂泵停泵后的压降数据,利用视均质型、线性裂缝型、复杂裂缝型致密砂岩裂缝性储层渗流方程分析储层渗流模式,利用G函数分析储层裂缝形态,从而综合评价缝网压裂裂缝复杂程度,形成一种快速评价缝网压裂裂缝复杂程度的方法。微地震测试成果证明了该方法的可靠性。研究成果可为致密砂岩裂缝性气藏缝网压裂效果评估及产能预测提供技术支持。
Microseism is an effective method and means to evaluate the fracture morphology and geometry formed by fracture network fracturing in fractured tight sandstone oil and gas reservoirs, but constrained by its applicability conditions and high cost. Therefore, a rapid, economical and applicable method is needed to evaluate the fracture complexity in fracture network fracturing. Based on the pressure drop data after fracture pump shutdown, the reservoir seepage model was analyzed by seepage equation which was established for tight sandstone fractured reservoirs with apparent homogeneity, linear fracture and complex fracture, and the reservoir fracture morphology was analyzed with G function, so as to comprehensively evaluate the fracture complexity in the network fracturing and develop a method to quickly evaluate the fracture complexity of the network fracturing. The microseismic test results proved that this method was reliable. The study results can technically provide support for the network fracturing effect evaluation and productivity prediction of tight sandstone fractured gas reservoirs.
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