Applying Frequency Spectral Analysis to Identify Milankovitch Cycle and Calculate Sedimentation Rate of Cretaceous in Wushi Sag

Xinjiang Petroleum Geology ›› 2007, Vol. 28 ›› Issue (2): 170-174.

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Applying Frequency Spectral Analysis to Identify Milankovitch Cycle and Calculate Sedimentation Rate of Cretaceous in Wushi Sag

ZHENG Min^1,2, PENG Gengxin³, LEI Gang-lin³, HUANG Shao-ying³, WU Chao³, GUO Hua-qing³, LI Yue-jun⁴

1. Lanzhou Petroleum Resource Center, Institute of Geology and Geophysics, CAS, Lanzhou, Gansu 730000, China;
2. Graduate School, CAS, Beijing 100039, China;
3. Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China;
4. Institute of Geology and Geophysics, CAS, Beijing 100029, China

Received:2006-05-18 Revised:2006-08-22 Online:2007-04-01 Published:2020-07-31

Abstract

Abstract: Based on abundant information of gamma-ray curves, combining wavelet analysis with fast Fourier transform, the Milankovitch cycle and its thickness of Cretaceous in Wushi sag is identified using frequency spectral analysis, then the sedimentation rates of each layer of Cretaceous in studied area are precisely calculated. The results show that the thickness of sedimentary cycle caused by eccentricity cycle ranges from 8.70 m to 13.89 m; the thickness of it caused by obliquity cycle from 3.01 m to 5.88 m; the one of it by precession cycle from1.28 mto 2.44 m, and the average sedimentation rate of Cretaceous strata fromfour sampling wells is 0.093 78 mm/a.

Key words: Wushi sag, gamma-ray curve, Fourier transform, sedimentary cycle, sedimentation rate/velocity

CLC Number:

TE111.3

ZHENG Min, PENG Gengxin, LEI Gang-lin, HUANG Shao-ying, WU Chao, GUO Hua-qing, LI Yue-jun. Applying Frequency Spectral Analysis to Identify Milankovitch Cycle and Calculate Sedimentation Rate of Cretaceous in Wushi Sag[J]. Xinjiang Petroleum Geology, 2007, 28(2): 170-174.

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Applying Frequency Spectral Analysis to Identify Milankovitch Cycle and Calculate Sedimentation Rate of Cretaceous in Wushi Sag

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