井震约束的大地电磁-重力联合反演研究

发布时间：2018-03-25 04:12

本文选题：井震约束　切入点：大地电磁　出处：《中国地质大学》2017年博士论文

【摘要】：研究一种基于测井、地震及地质资料约束下,二维、三维大地电磁与重力数据的非线性联合反演新方法。通过约束和联合反演,降低处理解释多解性,提高综合地球物理资料对研究目标的分辨率,具有重要的理论意义和实用价值。本文围绕基于井震约束的大地电磁与重力的非线性联合反演方法,开展了以下几方面的研究:1.开发了一种新的二维和三维多属性、多参数、实时、人机交互的建模软件。基于跨平台的Qt4开发环境,开发了快速准确的二维和三维电磁-重力联合建模程序,为重磁电约束联合正反演提供了有力支撑。提出并实现了两次插值法,即对剖分网格几何特征和属性值分别采用不同的插值方法,保证了地层内部属性不变而地质界线变化的地质规律。提出递进建模方法,先二维再三维,不需考虑复杂的三维空间曲面切割、拓扑多面体构建技术,方法技术简单可靠、结果正确,能够满足三维快速建模的需要。2.开发了二维、三维大地电磁与重力的并行正演模拟软件。基于MPI编程环境,完成了二维和三维的大地电磁和重力正演并行算法研究和开发。通过对频率的并行,二维有限差分正演的计算速度比串行的有限元方法快几十到上百倍,而精度相当;三维大地电磁有限差分正演结果与三维积分方程的相对误差小于2.2%;二维、三维大地电磁并行正演计算速度与参与并行的CPU个数基本成线性相关;实现了二维和三维重力正演对测点的并行计算,提高了计算速度。3.提出并实现了基于井震约束的二维和三维大地电磁与重力的人工鱼群并行联合反演。提出基于地层的电阻率与密度存在的物性关系建立联合约束条件。引入人工鱼群的群智能算法,并应用到二维和三维、大地电磁和重力的独立和联合反演中,采用多种模型测试了独立与联合反演方法的可行性和正确性。联合反演的电阻率值和密度值收敛精度明显高于单方法独立反演的结果,有效地提高反演精度。4.成功应用井震约束的大地电磁与重力人工鱼群并行联合反演技术发现了川中深层裂谷及南华纪有利目标。首次采用分层统计方法建立了研究区电阻率与密度的联合反演约束关系式;采用该方法对研究区的测线进行了井震约束下的二维大地电磁-重力的联合反演,提高了川中深层目标的精度,搞清了研究区的南华纪地层分布,指出有利油气聚集带,该推测解释结果得到了后期两口钻井的验证。
[Abstract]:A new nonlinear joint inversion method based on logging, seismic and geological data, two-dimensional and three-dimensional magnetotelluric and gravity data is studied. It is of great theoretical significance and practical value to improve the resolution of synthetic geophysical data. This paper focuses on the nonlinear joint inversion method of magnetotelluric and gravity based on well earthquake constraint. A new two-dimensional and three-dimensional multi-attribute, multi-parameter, real-time, human-computer interaction modeling software is developed. Based on a cross-platform Qt4 development environment, A fast and accurate 2D and 3D electromagnetic gravity joint modeling program is developed, which provides a powerful support for gravity magnetoelectric constraint joint forward and inverse modeling. A quadratic interpolation method is proposed and realized. That is to say, different interpolation methods are used for the geometric characteristics and attribute values of the meshes to ensure the geological law of the change of the geological boundary while the attributes of the strata are not changed. A progressive modeling method is proposed, which consists of two dimensions and three dimensions. The technology of constructing topological polyhedron is simple and reliable, and the result is correct, which can meet the needs of 3D fast modeling. 3D magnetotelluric and gravity parallel forward modeling software. Based on MPI programming environment, the research and development of 2D and 3D magnetotelluric and gravity forward modeling parallel algorithms are completed. The forward modeling speed of two-dimensional finite difference is tens to hundreds of times faster than that of serial finite element method, and the accuracy is the same; the relative error between three-dimensional magnetotelluric finite difference forward modeling and three-dimensional integral equation is less than 2.2; two-dimensional magnetotelluric finite-difference forward modeling is less than 2.2. The speed of 3D magnetotelluric parallel forward modeling is linearly related to the number of parallel CPU, and the parallel calculation of 2D and 3D gravity forward modeling is realized. The parallel joint inversion of two and three dimensional magnetotelluric and gravity artificial fish swarm based on well earthquake constraint is proposed and realized. A joint reduction based on the physical relationship between resistivity and density is proposed. Introduction of artificial fish swarm intelligence algorithm, And applied to two-dimensional and three-dimensional, magnetotelluric and gravity independent and joint inversion, Several models are used to test the feasibility and correctness of the independent and joint inversion methods. The convergence accuracy of the resistivity and density values of the joint inversion is obviously higher than that of the single independent inversion. The inversion accuracy is improved effectively .4.The parallel joint inversion technique of magnetotelluric and gravity artificial fish swarm constrained by well earthquakes has been successfully used to find the favorable targets of deep rift and Nanhua epoch in central Sichuan. The stratified statistical method has been established for the first time. The joint inversion constraint relation between resistivity and density; By using this method, the joint inversion of 2D magnetotelluric gravity under well earthquake constraints is carried out on the survey lines in the study area, which improves the precision of the deep target in the middle of Sichuan, makes clear the distribution of the South China formation in the study area, and points out the favorable oil-gas accumulation zone. The result of the conjecture interpretation was verified by two later drilling wells.
【学位授予单位】：中国地质大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：P631

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