四川盆地阆中—广安地区低孔渗储层含气性预测实例

A Case Study of Gas-bearing Probability of Low Porosity and Low Permeability Gas Reservoirs in Langzhong-Guang'an Area, Sichuan Basin

针对四川盆地阆中—广安地区二维测网跨年度、多测线、大面积,地震资料噪声发育,河流相沉积储层薄且低孔低渗、横向变化大等地震地质特点,在做好地震资料时间、能量闭合的基础上,注重叠前保真保幅等关键环节的处理,为构造解释及储层预测提供高质量的道集及成果数据。充分利用叠前同时反演的优势,获取与岩性及含油气性密切相关的弹性参数,如纵横波速度比、泊松比等。通过对含油气敏感性参数进行统计及交会分析等,进行储层及含油气性预测,取得了明显的地质效果。

2D seismic project in Langzhong-Guang'an area has been operated over years and crossed vast terrain with strong ground roll. The target is thin layers deposited on flow phase with low porosity and low permeability, changing a lot laterally. Dependent on reliable enclosure checking procedures to timing and energy distribution in the seismic data volume, high-quality gathering and final results are provided for structure interpretation and reservoir prediction by laying emphasis on preserving preservation of amplitude and fidelity. Those elastic parameters related with lithology and hydrocarbon potential, i.e. ratio of P/S wave and Poisson's ratio, are obtained after prestack inversion. Prediction of reservoir and hydrocarbon potential is carried out through statistics and cross-plot analysis of reservoir sensitive parameters, and remarkable geological results are obtained.