【摘要】 碳酸盐油气藏中裂缝分布控制着油气的产能,确定裂缝发育的区域、方位和密度在裂缝性油气藏勘探开发中具有重大意义。理论与实践证实P波传播速度、反射振幅及AVO斜率随观测方位角呈余弦关系变化。针对黄骅坳陷歧口凹陷扣46井区沙一段生物灰岩储集层,开展三维纵波方位AVO属性分析。经过实际地震资料的叠前精细处理,分方位提取速度、振幅等参数,利用方位AVO各向异性方法预测出工区内沙一段生物灰岩储集层分布范围和裂隙发育带。指出裂缝方向以北东向为主,以小型溶孔、裂隙为主,缺少大型缝洞,储层非均质性强,呈宽带状分布,受古地貌影响大。更多还原

【Abstract】 Fractures geometry and density are the main factors controlling oil and gas productions of fractured reservoirs,the determination of which is of great importance in fractured reservoir exploration.Theoretical and experimental observations proved cosine relationships among P-wave velocity,reflection amplitude and AVO slope.3-D P-wave AVO processing and interpretation have been applied to biolithite reservoirs in Sha-I segment of borefield K-46 in Qikou Sag,Huanghua Depression.Fracture development zones and biolithite reservoirs distribution in Qikou sag are detected with parameters such as velocity,amplitude and azimuthally AVO attributes volume from Prestack amplitude-preserved processing of seismic data.The research results indicated that most of the fractures were in NE direction,featured by minor dissolved pores and fissures.Under the control of paleogeomorphology,the reservoirs present obvious heterogeneity and wide-stripped distribution.更多还原