【摘要】 根据盆缘露头、盆内岩心和成像测井分析松辽盆地南部营城组火山岩裂缝特征,利用正演结果优选裂缝叠前地震识别方法。营城组火山岩节理以垂直和高角度节理为主,约占80%,低角度节理和水平裂缝约占20%;按走向有3组,分别是北西-南东、近南北和北东-南西向。构造缝表现为高电导率(暗色)、连续、较规则的正弦-余弦曲线,也可呈暗色近垂直-水平线状,并交织成网状。成岩缝在FMI图像上可表现为高导和高阻2种类型,多数为黑色不规则中低角度正弦-余弦曲线,连续性差。通过正演发现振幅方位椭圆长轴方向近似地代表了裂缝走向,短轴方向近似地代表了裂缝法向,且含气时的椭圆扁率较含水时大。据此利用叠前地震振幅属性识别裂缝走向,其结果与成像测井解释结果具有一致性,可为火山岩勘探开发提供依据。更多还原

【Abstract】 This paper analyses the characteristics of the volcanic fractures of Yingcheng Formation in the south of Songliao Basin by using the outcrops,cores and FMI data.It optimizes the recognition method of the pre-stack seism by forward model.The vertical and high-angle joints account for about 80% of the total volcanic rock joints of Yingcheng Formation,while the horizontal and low-angle joints account for about 20%.There are 3 sets of joints in the outcrop.Their strikes are NW-NE,nearly S-N and NE-SW.The structural fractures show as continuous high conductivity sinusoidal curves of the FMI image.And the lithological fractures also show high conductivity or high resistance sinusoidal curves on the FMI image with irregularity and relatively lower continuity.The seismic forward simulation indicates that the direction of the long axis of the seismic reflection amplitude ellipse approximately represents the strike of the fractures while the direction of the minor axis approximately represents the normal direction of the fractures,besides,the ellipticity of the ellipse with gas is larger than that with water.Based on the above,the strike of the fractures is recognized by using the pre-stack seismic attribute.The interpreted results are consistent with the results interpreted by imaging logging.The results can provide the basis for the volcanic rock exploration and development.更多还原