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束鹿凹陷地区沙三段泥灰岩是主要的生油与储油地层,由于其基质孔隙不发育,裂缝成为主要的油气运移通道,寻找有利裂缝发育带在油气勘探研究中具有重要的意义。以宽方位地震数据为基础,本文根据宽方位资料HTI介质的反射系数公式,划分多个方位进行叠前反演,可得到对应的分方位横波阻抗,再根据地震波在裂缝介质中分裂出快慢横波的理论,进行地层的各向异性研究,获取地层裂缝信息,半定量预测地层裂缝的方向和强度。该两种方法已在束鹿凹陷沙三段泥灰岩储层的裂缝预测研究中应用,取得了较为理想的效果。
As the main oil-producing and oil-bearing strata, the Shahejie marl is the main strata in the Shulu Sag, and the fractures are the main hydrocarbon migration channels due to the lack of matrix porosity. It is of great significance to search for favorable fracture development zones in the research of hydrocarbon exploration . Based on the wide-azimuth seismic data, according to the reflection coefficient formula of wide-azimuth data HTI media, the multi-azimuth inversion can be divided into several directions to obtain the corresponding transverse shear impedance. According to the seismic wave, The theory of anisotropy stratigraphy, stratum fracture information, semi-quantitative prediction of stratum fracture direction and intensity. The two methods have been applied in the prediction of the marl of the Shahejie Formation in the Shulu Sag, and achieved satisfactory results.