【摘要】 盆地基底岩性岩相对于研究盆地构造格架、构造演化以及对后期沉积特征及油气分布的影响等具有重要意义.勘探困难区,构造复杂、基底埋深大、岩性岩相复杂,造成地震资料识别基底岩性岩相存在诸多困难.不同岩性的火成岩具有不同的密度、磁化率和电阻率特征及组合特征,使应用多方法组合提高解释精度成为可能.文中介绍了利用高精度重磁电资料划分基底岩性岩相的方法.基于计算机辅助自动识别,相比传统依靠人工对比划分的方法,提高了工作效率和划分精度.利用这种方法,结合重磁电物性组合特征,对研究区的岩性、岩相进行了划分.研究区有喷发相、侵入相等.岩性有中酸性侵入岩、中酸性喷发岩等.重磁电综合解释是研究基底的有效方法组合.更多还原

【Abstract】 Basement lithology lithofacies identification is an important factor in the research of the structure,evolution,sedimentary and the hydrocarbon distribution.It is difficult to identify the lithofacies of the basement and the igneous rocks in the complicated area,for the structures are strongly deformed,the basement buried deep and the lithofacies is complex.However,it is a feasibility study to identify the lithofacies of the basement and the igneous rocks using joint method of gravity,magnetic,and electricity,because there’s the different density magnetism and resistivity characteristics and combination characteristic in the various igneous rocks,respectively.A computer assisted method to identify the lithofacies of the basement igneous rocks is used in this paper,which is more efficient than the manual ones.Using this method and gravity,magnetic,and electricity combination characteristics,the lithology and lithofacies of the project area are divided.They have the eruption and the intrusive lithofacies etc.The lithologies are the middle acidic intrusive and the middle acidic eruptive rocks etc.The synthetic interpretation of the gravity,magnetic,electricity is an effective combination method to study the basement.更多还原