四川盆地前寒武系重磁电物性特征与建模

四川盆地安岳特大型气田的发现，证明了中国前寒武系油气前景广阔，四川盆地元古界也因此成为超深层油气勘探的重点领域。非地震勘探是超深层油气勘探中深部结构研究的重要手段。然而，四川盆地前寒武系重磁电物性资料不足，制约了物性建模，严重影响了重磁电勘探技术在该盆地的有效应用。为此，以四川盆地周缘前寒武系露头标本为基础，通过对沉积岩、变质岩及火成岩标本的密度、磁化率和复电阻率进行分析并研究不同地层、不同岩性标本的重磁电物性特征，建立了四川盆地前寒武系古老地层的重磁电物性模型，为该盆地前寒武系非地震油气勘探提供了物性资料基础。

Physical properties and modeling of density,susceptibility and resistivity of Pre-Cambrian system in Sichuan Basin

The discovery of the large Anyue gas field in the Sichuan Basin has proved that oil and gas resources in the Pre-Cambrian strata are rich and promising in China.Then the Proterozoic system in the Sichuan Basin is becoming a key field for deep oil and gas exploration.Non-seismic exploration is an important means for investigating ultra-deep oil and gas reservoirs.However,gravity,magnetic and electromagnetic data of the Pre-Cambrian in the Sichuan Basin are insufficient,so it is difficult to model the basin upon the gravity,magnetic and geoelectrical structures, limiting the application of gravity,magnetic and electromagnetic exploration.Based on the Pre-Cambrian outcrops in the Sichuan basin,the density,susceptibility,complex resistivity and polarization were analyzed on the samples of the sedimentary rocks,metamorphic rocks and igneous rock,models of gravity,magnetic,and geoelectrical properties of the ancient Pre-Cambrian strata were built.The important parameters of the Pre-Cambrian hydrocarbon source rock based on gravity,magnetic and electric data provide the physical basis for the processing and interpretation of non-seismic data for oil and gas exploration in Sichuan Basin.