准噶尔盆地莫索湾—陆西地区基于重磁资料的石炭系火山岩识别

发布时间：2018-07-25 19:53

【摘要】：该文首先从研究区内岩石的磁性、密度测量结果出发,阐述了利用重磁方法圈定火山岩的可行性。然后利用频率域滤波和边界增强技术,获得由石炭系火山岩引起的剩余重磁异常及其垂向二阶导数和Tilt导数,据此划定出研究区内火山活动带,并根据准噶尔地区火山机构岩相模式和重磁异常的对应关系,在各火山活动带内圈定火山机构。同时以剩余重磁异常的视密度和视磁化率反演结果为基础,结合重磁异常的组合情况和实测岩石物性数据,确定研究区内火山岩岩性分布情况。最后利用磁力数据开展欧拉反演,定量了解研究区火山岩的埋深情况,并在地震数据的约束下,选择典型剖面开展二维重磁联合正演,刻画剖面地质结构和火山岩垂向分布。总之,通过重磁异常研究,获得了火山岩及其岩性的空间分布情况,为后续进一步的火山岩油气勘探提供了依据。
[Abstract]:Based on the results of magnetic and density measurements of rocks in the study area, the feasibility of delineating volcanic rocks by gravity and magnetic method is expounded in this paper. Then the residual gravity and magnetic anomalies caused by the Carboniferous volcanic rocks and their vertical second derivative and Tilt derivative are obtained by using frequency domain filtering and boundary enhancement techniques. According to the lithofacies model of volcanic mechanism and the corresponding relation of gravity and magnetic anomaly in Junggar area, the volcanic mechanism is delineated in each volcanic active zone. On the basis of the inversion results of apparent density and apparent susceptibility of residual gravity and magnetic anomalies, combined with the combination of gravity and magnetic anomalies and the measured data of rock physical properties, the lithologic distribution of volcanic rocks in the study area is determined. Finally, using magnetic data to carry out Euler inversion, quantitatively understand the buried depth of volcanic rocks in the study area, and under the constraint of seismic data, select typical sections to carry out two-dimensional gravity and magnetic joint forward modeling to depict the geological structure and vertical distribution of volcanic rocks. In a word, the spatial distribution of volcanic rocks and their lithology is obtained through the study of gravity and magnetic anomalies, which provides the basis for further exploration of volcanic rock oil and gas.
【作者单位】：南京大学地球科学与工程学院;新疆自然资源与生态环境研究中心;新疆维吾尔自治区人民政府国家305项目办公室;
【基金】：国家科技支撑计划项目(2015BAB05B00)
【分类号】：P618.13

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