利用高分辨率三维地震资料 预测桑塔木地区三叠系储层

Hydrocarbon-bearing prediction of Triassic formation in Sangtamu area with high resolution 3-D seismic data

在对塔里木盆地轮南桑塔木地区新采集的 5 2 6km2 的高分辨率三维地震资料进行精细目标解释时 ,发现本区主要含油气目的层 (三叠系Ⅲ油组 )顶面的地震反射在与桑塔木断垒带相对应的构造高位置存在着非常明显的强振幅异常 ,该断垒带上的高产油气井位于这些强振幅异常区内 ,且油气产量与振幅值密切相关。在这个断垒带的北侧 ,也存在一个与低幅度构造相对应的强振幅异常区 ,面积约为 2 0km2 。利用国产的GRIStation 3.0解释系统中的层位精细标定、多线剖面解释、波阻抗反演、属性提取及综合分析等特色功能 ,并根据本区的构造和沉积特征以及相邻油气田的油气层地震反射特征和油气聚集规律 ,对这个异常进行了仔细的分析研究。结果表明 ,该异常极有可能是由油气引起的。

It was found that the seismic reflections from the top of main hydrocarbon-bearing target (i.e.Triassic oil-bearing formation III) exhibits significantly strong amplitude anomalies in the area corresponding to the structural high of Sangtamu fault horst, during fine interpretation on the 526 km 2 high resolution new 3-D seismic data obtained in Sangtamu area of Tarim basin. The prolific oil and gas wells lie inside the amplitude anomalies, their productions are closely related to the amount of amplitude. To the north of the fault horst, there is a strong amplitude anomaly that is corresponding to a low amplitude structure and covers 20 km 2.Guided by the structural and sedimentary characteristics as well as characteristics of seismic reflection and regulation of hydrocarbon accumulation in neighboring reservoirs, processing such as fine calibration of horizon, multi-line interpretation, wave impedance inversion, and attribute extraction was performed on this anomaly with homemade GRIStation 3.0 interpretation system. The results show that the anomaly is probably caused by hydrocarbon accumulation.