鄂尔多斯盆地南缘CEMP资料的电性响应分析
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摘要
地层岩石的电性特征是开展电法勘探和资料处理解释工作的基础,引起电性异常的物性参数主要是与地层岩石电阻率分布的大小有关。在开展鄂尔多斯盆地南缘地区的连续电磁剖面法(CEMP)资料时,发现使用相同的电性组合特征追踪三叠系和二叠系时非常困难。为了解决这一问题,对测区及周边的多口电测井资料进行了统计分析,并对三叠系和二叠系在不同地区的电性组合及分布特征进行了分析研究。结果表明,同一套地层组合在东、西部地区表现为不同的电性组合特征,即在东部地区,三叠系的电阻率高于二叠系的电阻率;而在西部地区,三叠系的电阻率低于二叠系的电阻率。按照这一规律重新解释的CEMP剖面更为客观合理,解释结果符合油田地质学家的推测,并依据CEMP成果部署了地震勘探。
Electrical characteristics of rock are the basis to carry out electrical prospecting and data processing interpretation.Physical parameters leading to electric anomaly are mainly related to the size of rock resistivity distribution.While analyzing the CEMP data in southern margin of Ordos Basin,it is found that there is great difficulty in tracking the Triassic and Permian by using the same electric combination properties.To solve the problem,statistical analysis is made on the electric logging data of multiple wells in the surveyed area and its surrounding areas,moreover the electric combination and distribution characteristics of different areas of the Triassic and Permian are analyzed and studied.Results show that the same set of strata in eastern and western areas shows different electric properties,i.e.in the eastern area the resistivity of the Triassic is higher than that of the Permian,while in the west the resistivity of the Triassic is lower than that of the Permian.The CEMP profile reinterpreted according to the above law is more objective and reasonable,and the interpretation result conforms to the prediction of geologists.Seismic exploration is deployed on the basis of the CEMP results.
Electrical characteristics of rock are the basis to carry out electrical prospecting and data processing interpretation.Physical parameters leading to electric anomaly are mainly related to the size of rock resistivity distribution.While analyzing the CEMP data in southern margin of Ordos Basin,it is found that there is great difficulty in tracking the Triassic and Permian by using the same electric combination properties.To solve the problem,statistical analysis is made on the electric logging data of multiple wells in the surveyed area and its surrounding areas,moreover the electric combination and distribution characteristics of different areas of the Triassic and Permian are analyzed and studied.Results show that the same set of strata in eastern and western areas shows different electric properties,i.e.in the eastern area the resistivity of the Triassic is higher than that of the Permian,while in the west the resistivity of the Triassic is lower than that of the Permian.The CEMP profile reinterpreted according to the above law is more objective and reasonable,and the interpretation result conforms to the prediction of geologists.Seismic exploration is deployed on the basis of the CEMP results.
引文
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