东北地区大型断裂构造重力异常解释研究

发布时间：2018-12-14 12:12

【摘要】：分析总结学习以往的重力勘探数据处理解释方法,本文通过对“全国矿产资源潜力评价”项目重力汇总成果的断裂构造部分的研究学习,运用断裂位置计算的新方法对东北地区断裂构造进行进一步研究,通过郯庐断裂的北段—已知的依舒断裂段进行对比验证,证实斜导数水平导数方法的可行性,得到中国东北地区断裂构造结构框架,以及该断裂框架与东北构造单元和矿产分布的叠加关系显示,初步获得对断裂控矿的新认识,进一步深入的探讨了东北地区构造格架的重磁场特征,及其与资源的关系。为该地区的资源勘探提供了重要的依据。通过对东北研究区的研究,本文取得的主要研究成果如下:(1)本文研究了在多种模型体存在下的重力异常的水平梯度,垂向梯度,斜(Tilt)导数及斜(Tilt)导数水平导数的剖面曲线异常特征,总结了这四种导数方法在探测模型边界的应用中的误差情况和限制条件;通过地质上已知特征的依舒断裂段,验证方法的有效性。(2)对东北地区的布格异常图、剩余异常图和航磁异常图对研究区进行重力分区;结合基础地质背景研究资料,前人认识成果,得到不同地块和地块结合带异常分区界限的基础认识,基于重力异常在数理基础上反映的是块体体积效应、在地质客观上揭示自古到今多次地质构造运动综合效应的特点;(3)用斜(Tilt)导数和斜(Tilt)导数水平导数方法对研究区重力数据进行反演,得到该区隐伏大型断裂构造框架,对一级断裂进行初步解释,与全国矿产潜力评价项目中重力推断的断裂成果进行初步比较;并通过截取剖面数据对大兴安岭断裂带深部的倾斜方向进行初步判断;(4)通过利用推断得到的大型隐伏断裂与油气资源、固体矿产分布情况进行对比分析,得到东北地区大型断裂与油气和固体矿分布关系的基本特征;
[Abstract]:This paper analyzes and summarizes the previous methods of data processing and interpretation of gravity exploration. In this paper, the author studies the fault structure part of the gravity aggregate results of the "National Mineral Resources potential Evaluation" project. The new method of fault location calculation is used to further study the fault structure in Northeast China. The feasibility of the horizontal derivative method of oblique derivative is verified by comparing the northern section of the Tanlu fault with the known Yishu fault section. The structural framework of faults in Northeast China and its superposition relationship with the tectonic units and mineral distribution in Northeast China show that a new understanding of fault ore-controlling is obtained. The characteristics of gravity and magnetic field of the tectonic framework in Northeast China and its relationship with resources are further discussed. It provides an important basis for resource exploration in this area. The main results obtained in this paper are as follows: (1) the horizontal and vertical gradients of gravity anomalies in the presence of various models are studied in this paper. The profile curve anomaly characteristics of oblique (Tilt) derivative and oblique (Tilt) derivative horizontal derivative are summarized. The error and limitation conditions of these four derivative methods in detecting model boundary are summarized. The validity of the method is verified by the Yishu fault segment with known geological characteristics. (2) gravity zoning of the study area is carried out on the Bouguer anomaly map, residual anomaly map and aeromagnetic anomaly map of northeast China; Combined with the basic geological background research data and previous achievements, the authors obtained the basic understanding of the zoning boundaries of anomalies in different plots and combined zones. Based on the gravity anomaly, the block volume effect is reflected on the basis of mathematical theory. From the geological objective point of view, the characteristics of the comprehensive effects of geological tectonic movements from ancient to present are revealed. (3) the gravity data of the study area are inversed by the methods of oblique (Tilt) derivative and oblique (Tilt) derivative horizontal derivative, and the structural framework of the concealed large fault in this area is obtained, and the primary interpretation of the first order fault is carried out. A preliminary comparison is made with the fracture results derived from gravity inference in the national mineral potential evaluation project. The inclined direction in the deep part of the Daxing'anling fault zone is preliminarily judged by intercepting the profile data. (4) by comparing and analyzing the distribution of large hidden faults and oil and gas resources and solid minerals, the basic characteristics of the relationship between large faults and distribution of oil, gas and solid minerals in Northeast China are obtained.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.1

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