尼日利亚西北部Bida盆地北部部分地区及其周围基岩地下构造的欧拉反褶积及二维磁法模拟

Dzukogi Abubakar Nda'asabe, Sanusi Yusuf Abubakar, Muhammad Sabiu Bala, A. Salako
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引用次数: 2

摘要

利用航磁资料,对毕达盆地北部部分地区及其周围基岩进行了欧拉反褶积和二维建模。研究区以北纬9°00′10°30′和东经5°00′7°00′为界,总面积为36,300 km2。利用Oasis montaj对磁学数据进行处理,得到总磁学强度(TMI)数据,并将TMI数据还原为赤道(RTE)数据。在RTE网格上应用多项式滤波器进行区域残差分离。得到的残差数据进行欧拉深度评价和二维建模。欧拉反褶积对细微磁异常和基岩的深度评价范围为3.083 ~ 12.6 m。研究区西部、西南部和南部的法施、木夸、埃格巴科和比达一带沉积岩厚度最大。标记为AA、BB、CC和DD的剖面被仔细绘制,以切割研究区域的主要走向。利用标准欧拉反褶积的结果作为深度约束,对剩余磁场异常进行建模。模拟结果显示了基底/基底结构的平均深度。在研究区西南部Fashe、Mokwa和Egbako附近发现深度较高,深度约为3.1 km。该深度和区内盛行的裂缝/断裂对研究区油气成藏具有重要影响。乌石石/遵格鲁、迈瓦约、Paiko附近隐伏磁源靶区(磁性矿物)平均深度为12.8 m。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Euler Deconvolution and Two-Dimensional Modeling of Subsurface Structures over Part of Northern Bida Basin and its Surrounding Basement Rocks, Northwest, Nigeria Using Magnetic Method
Euler deconvolution and two-dimensional modeling over part of Northern Bida Basin and its surrounding basement rocks, using aeromagnetic data was carried out in this research study. The study area is bounded by latitude 9° 00′ 10° 30′ and longitude 5° 00′ 7° 00′ with total area of 36,300 km2. The magnetic data was processed using Oasis montaj to produce the total magnetic intensity (TMI) data The TMI data was reduced to equator (RTE). The polynomial filter was applied on the RTE grid to performed regional residual separation. The residual data obtained was subjected to euler depth evaluation and two-dimensional modeling. The depth to the subtle magnetic anomalies and basement rock evaluated from euler deconvolution ranged from 3.083 m to 12.6 m. The highest thickness of sedimentary rocks in the study area was observed around Fashe, Mokwa, Egbako and Bida at the west, southwest and southern part of the study area. The profiles labeled AA, BB, CC, and DD were carefully drawn to cut across major strike in the study area. The result obtained from standard euler deconvolution was used as depth constrain for modeling the residual magnetic field anomalies. The result obtained from modeling shows average depth to the basement/basement structure. The depth was found to be high reaching a depth of about 3.1 km around Fashe, Mokwa and Egbako in southwestern part of the study area. This depth and the prevailing fracture/fault in the area could influence the accumulation of hydrocarbon in the study area. The average depth to the subtle magnetic source target (magnetic minerals) around Wushishi/Zungeru, Maiwayo and Paiko were suggested to be 12.8 m.
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