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汪家屯气田营城组为非均质性强的低孔渗火山岩储层,裂缝对储层气孔和溶蚀孔洞起着非常重要的沟通作用,由于储层具有孔隙、裂缝双重介质特征,孔、缝间配置关系复杂多样,目前常用的利用叠后资料对裂缝的进一步精细描述及量化来识别小尺度裂缝的方法已经无法满足气藏的评价需求。提出了通过在处理前将地震资料重新进行方位角分选,提取到不受流体影响的横波差异属性,最终将变化处理后的属性参数以强度形式来表征,并以此来预测裂缝的发育情况的方法。应用多方位AVO裂缝检测技术预测了汪家屯地区营城组火山岩储层裂缝发育情况,相比传统相干技术,多方位AVO裂缝检测技术具有高的分辨率和识别小尺度裂缝的特点,预测结果与实际井解释结果也具有高的吻合度。
The Yingcheng Formation in Wangjiatun gas field is a heterogeneous low permeability porous volcanic reservoir. The fractures play a very important role in communication with the stomata and dissolved pores in reservoirs. Due to the dual media characteristics of pores and fractures in reservoirs, The configuration relationship is complex and diverse. At present, the commonly used method of describing fine cracks by using poststack data and quantitatively identifying small-scale cracks can not meet the evaluation requirements of gas reservoirs. It is proposed that the attribute of shear wave which is not influenced by fluid be extracted by re-azimuth sorting of seismic data before processing, and finally the property parameters after the change processing are characterized by intensity form to predict the development of the fracture Methods. The application of multi-directional AVO crack detection technology predicts the development of volcanic reservoir fractures of Yingcheng Formation in Wangjiatun area. Compared with traditional coherent technology, multi-directional AVO crack detection technology has high resolution and small fractures identification. The prediction results are in good agreement with the actual Well interpretation results also have high agreement.