摘要
通过钻井、录井、测井、岩心以及地震响应综合研究,确定了巴西桑托斯盆地深水区S油田发育两种岩性、四套火成岩体,分别为A层内部、C层内部、D层底部的玄武岩和D层顶部的辉绿岩,相对于玄武岩,辉绿岩发育规模小、厚度薄。火成岩在测井上表现为"两高一低""曲线特征(高密度、高伽玛、低声波),总体上物性较差,玄武岩平均孔隙度小于5%,局部发育孤立孔,裂缝较少,辉绿岩致密,无可见孔。厚层玄武岩夹薄层灰岩在地震剖面上表现为杂乱反射特征,厚层块状玄武岩表现为空白反射特征,辉绿岩表现为单轴强反射特征。综合地震属性明确了火成岩主要分布于伸展断层的上下两盘,推测与深大断裂有关。
Two lithologies,four igneous bodies in S deep water oilfield,Santos Basin of Brazil are determined using drilling,logging,core and seismic reflection comprehensively.Basalt is inside the A layer,C layer and bottom of the D layer.Diabase is on the top of D layer.Comparing with basalt,the scale of diabase is smaller in vertical and horizontal directions.The characteristics of igneous in the log are two high and one low（high-density,high gamma,low sonic wave）.Their physical property is poor and the average porosity of basalt is not more than 5%.A few pore in the basalt is not connectivity while fracture is rarely recognized,so the igneous are very hard.The characteristics of carbonate interlayer between the thick basalts in seismic profile are chaotic reflection configuration.And thick basalts are shaped blank reflection.The characteristics of diabase are single event and strong reflection.The views could be determined that the igneous ware formed at the two sides of normal faults by combined analysis seismic attributes and the volcano eruption was linked the faults.
出处
《物探化探计算技术》
CAS
CSCD
2016年第6期805-809,共5页
Computing Techniques For Geophysical and Geochemical Exploration
