四川盆地东北地区长兴组米兰科维奇周期分析  

Analysis of Milankovitch Cycles of the Changxing Formation in Northeastern Sichuan Basin

作　　者：李凤杰[1] 郑荣才[1] 罗清林[2] 雷光明[2] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室 [2]四川石油管理局地质勘探开发研究院,重庆401120

出　　处：《中国矿业大学学报》2007年第6期805-810,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(40672073);中国科学院资源环境领域知识创新工程重要方向项目(KZCX3-SW-128-04)

摘　　要：为了研究川东北地区上二叠统长兴组中的米兰科维奇周期,采用Matlab提供的快速傅立叶变换数学函数,对该区测井曲线的频谱进行了分析.结果表明：长兴组中广泛地保存着123,44.89,35.11,21.16和17.72 ka的米兰科维奇沉积周期;地层中的沉积旋回主要受古气候变化的控制,偏心率、地轴倾角和岁差周期引起的地层旋回厚度变化范围分别为：10.64-13.74 m;2.89-5.35 m;1.57-2.40 m,其中受偏心率周期的影响最大.不同测井曲线虽然对地层中物理参数的敏感程度不同,但是反映的地质信息是一致的,都能很好地反映由气候变化引起的地层旋回.Matlab中的数学函数,简化了数学运算的过程,为地质工作者定量研究地质问题提供了一条简明有效的途径.For the research on Milankovitch cycle of the Permian Changxing formation in northeastern Sichuan basin, the frequency spectrum of logging curves was analyzed with fast Fourier transform function offered by Matlab language. The results show that the Changxing Formation strata conserve widely Milankovitch sedimentary cycles of 123,44.89,35.11,21.16 and 17.72 ka. The sedimentary cycles are controlled by palaeo-climate, which caused by the eccentricity cycle, the obliquity cycle and the precession cycle. The thickness ranges of sedimentary cycles caused by the eccentricity cycle, the obliquity cycle and the precession cycle are 10.64-- 13.74 m, 2.89--5.35 m and 1.57--2.40 m, respectively. Among the three control factors, the eccentricity cycle has the most important effect on the Changxing formation of Milankovitch cycle. Different logging curves have different sensitivities to physical parameter in the strata, but show the same geological information, and reflect sedimentary cycles which caused by palaeoclimate. Mathematic function in Matlab can simplify the procedure of mathematic operation greatly. It offers an effective way for geologists to research geological problems quantitatively.

关 键 词：测井曲线 米兰科维奇旋回 MATLAB 快速傅立叶变换 川东北地区 长兴组 

分 类 号：P631.817[天文地球—地质矿产勘探] TE121.34[天文地球—地质学]