土库曼斯坦阿姆河地区点礁储层地震正演模拟及响应

Forward Seismic Modeling and Its Response of Point-reef Reservoir in Amudarya Area of Turkmenistan

针对阿姆河右岸地区点礁储层发育的类型和特点,通过利用实钻井信息建立地质模型,采用高阶有限差分方法,模拟了基于实际介质模型条件下的点礁地震波场响应。模拟结果表明,在阿姆河右岸地区,点礁的地震响应为丘形和透镜状反射,在地震剖面上有局部高点,有向上穹隆冲顶现象;点礁顶面具有较强的反射特征,内部则表现为断续的、成层性较差的反射结构,底部反射近于平直。不同频率子波正演剖面表明,随着子波频率的增加,点礁岩层下部的反射能量变强。子波频率大于30 Hz时,厚度大于50 m的点礁内部会出现强轴反射。

A seismic geological model was set up based on the type and characteristics of point-reef reservoir growth and information of drilled wells in the right side of Amudarya Area.By using high-order finite difference method,a forward seismic modeling was carried out to simulate the seismic response of point reefs.The result shows that seismic response of point reefs is characterized by mound and lens seismic reflection.Features of point reefs in the seismic section are local peak and upward domical protrusion,strong seismic reflection on the top of point reefs,discrete and poor bedded seismic reflection inside the point reefs,flatten reflection on the bottom of point reefs.The forward seismic modeling sections of different frequency wavelets reveal reflection,strength on the bottom of point reefs increases with the wavelet frequency increase.The point reefs are strong reflection when wavelet frequency is more than 30 Hz and thickness of point reefs is more than 50 m.