识别火成岩岩性的综合物探技术

自从发现火成岩油气藏以来，在油田勘探中火成岩岩性岩相的勘探研究备受关注。以SN地区为例，介绍了重磁电震综合勘探火成岩岩性岩相识别技术。地震方法能够发现火成岩,并高精度确定火成岩深度，甚至圈定火成岩范围，但难以确定火成岩岩性岩相。重磁电资料能够识别具有密度、磁性和电阻率等特征差异的火成岩岩性岩相，对火成岩体平面位置的确定具有一定精度，但对深度确定精度不高。在高精度资料的基础上，采用地震与重磁电联合处理解释技术，能有效地提高重磁电方法的勘探精度，使重磁电异常更直接反映深部火成岩。SN地区火成岩岩性岩相的勘探实例说明，重磁电震综合勘探技术识别火成岩岩性与实际情况吻合率较高，预测结果得到了钻探证实。

Integrated geophysical techniques for identification of igneous rocks.

Since the discovery of reservoir developed in igneous rocks, the research of igneous rocks in terms of lithology and facies have been becoming the focus for oilfield exploration. In this paper we introduce the identification of lithology and facies of igneous rock with integrated geophysical techniques (gravity, magnetic, electrical method and seismic survey) in SN area. With seismic data, igneous rocks and their extension can be determined, but their lithology and facies are hard to determine, so we adopted GMES techniques to solve this problem in the area, which include gravity stripping with gravity data and constraint inversion with TEM data on the basis of known seismic data. High precision data has been achieved in terms of igneous rocks depth, lithology as well as their facies, which has been verified with later drilling data.