广域电磁测深理论的有效性试验研究
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摘要
广域电磁法是何继善院士于本世纪初提出的一种新的人工源频率域电磁勘查方法。为了研究这一新方法在实践中的有效性,选择大杨树盆地(油气远景区)进行了首次野外试验,并以此作为论文的主题。
本文首先回顾了电磁法发展的历史,评述了大地电磁法(MT)和可控源音频大地电磁法各自的优点和不足,叙述了广域电磁法提出的技术背景。然后以电磁场理论为指导,推导了均匀半空间和层状半空间条件下,水平电偶极源和垂直磁偶极源电磁场的理论公式,作为广域电磁法有效性试验研究的理论基础。论述了广域电磁法的基本原理、提取视电阻率的方法,以及广域电磁法的主要优点。研究了实际采用的双极源与标准的偶极源的差异,分析计算了用双极源替代偶极源引起的误差,指出用双极源代替偶极源的使用范围。
接着介绍了大杨树盆地的地理位置、地质构造、地层岩性特征和油气勘查远景,
重点介绍了大杨树盆地以往获得的岩石电性参数,分析了电磁法运用于大杨树盆地的可行性以及可能遇到的地电断面类型。阐述了选择大杨树盆地进行广域电磁法有效性试验研究的理由和实际意义。叙述了大杨树盆地广域电磁法试验研究工作的测区选择、测线测点布置、野外工作参数、完成的工作量和数据质量。
选择LYC1线100、110、120、130、140和149共6个测深点的广域电磁测深进行地质—地球物理解释,采用的解释方法是：设计地电模型,理论计算正演视电阻率曲线并与实测曲线比较拟合,逐次修改模型参数,直到理论曲线与实测曲线拟合到满意的精度为止。并在此基础上进行二维反演。
根据解释结果勾绘了LYC1线的物理解释地电断面,并与钻井控制的地质剖面和地震勘探资料相比较,获得了LYC1线广域电磁法的地质解释断面：广域电磁法反映的深度为1350m～1600m的第二、第三电性层的分界面,与杨参1井1600m深度的白垩系下统甘河组与九峰山组的分界面很接近,而杨参1井在九峰山组见到了含油显示。
对比研究了广域电磁法与可控源音频大地电磁法对大杨树盆地油气构造的反映,确认广域电磁法勘查大杨树盆地类型的油气构造是有效的。
广域电磁法在大杨树盆地的有效性试验研究获得了令人鼓舞的成果,建议在大杨树盆地的其他地区或类似地区进一步开展广域电磁法普查油气构造的试验研究。
Wide-field electromagnetic method (WFEM) is a new frequency domain controlled source electromagnetic prospecting method proposed by He Jishan academician.In order to study the validity of this new method, the Dayangshu basin (an oil and gas prospect area) was selected to do fitst field experiment, and use it as the topic of this paper.
Firstly, the history of development of electromagnetic prospecting methods are reviewd, the advantages and disadvantages of MT and CSAMT are discussed, the technical background of WFEM are introduced in this paper. Under the guidance of electromagnetic field theory, theoretical expressions of horizontal electrical dipole and vertical magnetic dipole in the uniform and layered conductive half space are derived as the theoretic base. The basic principle of WFEM, method of collecting apparent resistivity and the main advantages of WFEM are discussed. The difference between bipolar source and standard dipole source in actual use is studied,then errors using bipolar instead of dipole source is analyzed and calculated, and points out the applying range of use bipolar source to replace dipole source.
The geographic position, regional geological construct, characters of stratum and lithology and oil and gas prospecting perspective of Dayangshu basin are recounted, electrical parameters of rock measured at Dayangshu area before this experimant are emphatically narrated, feasibility of electromagnetic method used to Dayangshu area and types of geoelectrical section which could be meeted are analyzed.It is recounted such as selected survey regions, laid surveying lines and points, working parameters in field, finished quantity and quality, etc.
Selecting100、110、120、130、140and149measuring point of LYC1line (6points together), geological and geophysical interpretations of Dayangshu area are made. Designed geoelectrical model for interpretaion, theoretically calculating forward apparent resistivity curve and to compare it with the measured apparent resistivity value, parameters of the model to be repeatedly corrected until to the theoretical forward apparent resistivity curve fited with measured apparent resistivity curve in a satisfying precision.
According to the results of interpretation, the physical interpretating geoelectrical section of LYC1line wouls be drawes. Then this section is compared with geological
section exposed by drilling hole and seismic exploring informations, The geological section of LYC1line interpreted by WFEM are obtained. The interface depth between second electrical layer and third electrical layer obtained by WFEM (which is1350-1500m) and the interface depth between ganhe group and jiufengshan group of Cretaceous (which is1600m) are nearly equal. The oil and gas show of jiufengshan group are exposed by Yangcan1well. The reflect to Dayangshu basin oil and gas formation of WFEM and CSAMT is compared and studied, the effectivity of WFEM to prospect Dayangshu basin oil and gas formation would be affirmed
The results of WFEM effectivity experiment at dayangshu basin WFEM are stimulative. So it is suggested that prospecting oil and gas resource used WFEM should be further made at Dayangshu or similar area.
本文首先回顾了电磁法发展的历史,评述了大地电磁法(MT)和可控源音频大地电磁法各自的优点和不足,叙述了广域电磁法提出的技术背景。然后以电磁场理论为指导,推导了均匀半空间和层状半空间条件下,水平电偶极源和垂直磁偶极源电磁场的理论公式,作为广域电磁法有效性试验研究的理论基础。论述了广域电磁法的基本原理、提取视电阻率的方法,以及广域电磁法的主要优点。研究了实际采用的双极源与标准的偶极源的差异,分析计算了用双极源替代偶极源引起的误差,指出用双极源代替偶极源的使用范围。
接着介绍了大杨树盆地的地理位置、地质构造、地层岩性特征和油气勘查远景,
重点介绍了大杨树盆地以往获得的岩石电性参数,分析了电磁法运用于大杨树盆地的可行性以及可能遇到的地电断面类型。阐述了选择大杨树盆地进行广域电磁法有效性试验研究的理由和实际意义。叙述了大杨树盆地广域电磁法试验研究工作的测区选择、测线测点布置、野外工作参数、完成的工作量和数据质量。
选择LYC1线100、110、120、130、140和149共6个测深点的广域电磁测深进行地质—地球物理解释,采用的解释方法是：设计地电模型,理论计算正演视电阻率曲线并与实测曲线比较拟合,逐次修改模型参数,直到理论曲线与实测曲线拟合到满意的精度为止。并在此基础上进行二维反演。
根据解释结果勾绘了LYC1线的物理解释地电断面,并与钻井控制的地质剖面和地震勘探资料相比较,获得了LYC1线广域电磁法的地质解释断面：广域电磁法反映的深度为1350m～1600m的第二、第三电性层的分界面,与杨参1井1600m深度的白垩系下统甘河组与九峰山组的分界面很接近,而杨参1井在九峰山组见到了含油显示。
对比研究了广域电磁法与可控源音频大地电磁法对大杨树盆地油气构造的反映,确认广域电磁法勘查大杨树盆地类型的油气构造是有效的。
广域电磁法在大杨树盆地的有效性试验研究获得了令人鼓舞的成果,建议在大杨树盆地的其他地区或类似地区进一步开展广域电磁法普查油气构造的试验研究。
Wide-field electromagnetic method (WFEM) is a new frequency domain controlled source electromagnetic prospecting method proposed by He Jishan academician.In order to study the validity of this new method, the Dayangshu basin (an oil and gas prospect area) was selected to do fitst field experiment, and use it as the topic of this paper.
Firstly, the history of development of electromagnetic prospecting methods are reviewd, the advantages and disadvantages of MT and CSAMT are discussed, the technical background of WFEM are introduced in this paper. Under the guidance of electromagnetic field theory, theoretical expressions of horizontal electrical dipole and vertical magnetic dipole in the uniform and layered conductive half space are derived as the theoretic base. The basic principle of WFEM, method of collecting apparent resistivity and the main advantages of WFEM are discussed. The difference between bipolar source and standard dipole source in actual use is studied,then errors using bipolar instead of dipole source is analyzed and calculated, and points out the applying range of use bipolar source to replace dipole source.
The geographic position, regional geological construct, characters of stratum and lithology and oil and gas prospecting perspective of Dayangshu basin are recounted, electrical parameters of rock measured at Dayangshu area before this experimant are emphatically narrated, feasibility of electromagnetic method used to Dayangshu area and types of geoelectrical section which could be meeted are analyzed.It is recounted such as selected survey regions, laid surveying lines and points, working parameters in field, finished quantity and quality, etc.
Selecting100、110、120、130、140and149measuring point of LYC1line (6points together), geological and geophysical interpretations of Dayangshu area are made. Designed geoelectrical model for interpretaion, theoretically calculating forward apparent resistivity curve and to compare it with the measured apparent resistivity value, parameters of the model to be repeatedly corrected until to the theoretical forward apparent resistivity curve fited with measured apparent resistivity curve in a satisfying precision.
According to the results of interpretation, the physical interpretating geoelectrical section of LYC1line wouls be drawes. Then this section is compared with geological
section exposed by drilling hole and seismic exploring informations, The geological section of LYC1line interpreted by WFEM are obtained. The interface depth between second electrical layer and third electrical layer obtained by WFEM (which is1350-1500m) and the interface depth between ganhe group and jiufengshan group of Cretaceous (which is1600m) are nearly equal. The oil and gas show of jiufengshan group are exposed by Yangcan1well. The reflect to Dayangshu basin oil and gas formation of WFEM and CSAMT is compared and studied, the effectivity of WFEM to prospect Dayangshu basin oil and gas formation would be affirmed
The results of WFEM effectivity experiment at dayangshu basin WFEM are stimulative. So it is suggested that prospecting oil and gas resource used WFEM should be further made at Dayangshu or similar area.
引文
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