Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (2): 113-124.doi: 10.12108/yxyqc.20230211

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

High-frequency sequence division and geological significance of dolomiteevaporite paragenetic strata of Cambrian Gaotai Formation in eastern Sichuan Basin

HU Zhonggui1,2, WANG Jixuan1,2, LI Shilin3, GUO Yanbo3, ZUO Yun'an3, PANG Yulai3   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Sedimentary Basin Research Center, Yangtze University, Wuhan 430100, China;
    3. Chongqing Gas Mine, PetroChina Southwest Oil and Gas Field Company, Chongqing 402160, China
  • Received:2022-07-05 Revised:2022-08-04 Online:2023-03-01 Published:2023-03-07

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Abstract: The dolomite-evaporite paragenetic strata are rich in oil and gas resources. Based on the principle of sequence stratigraphy, combined with drilling and thin section data, and on the basis of third-order sequence division, INPEFA and wavelet transform technologies were used to identify and divide the high-frequency sequences of dolomite-evaporite paragenetic strata of Cambrian Gaotai Formation in eastern Sichuan Basin. The results show that:(1) The dolomite-evaporite paragenetic strata of Cambrian Gaotai Formation in eastern Sichuan Basin can be divided into three third-order sequences which are respectively Sq1, Sq2 and Sq3 from bottom to top, and can be further divided into six fourth-order sequences(ssq1-ssq6). The Gaotai Formation is mainly in a carbonate platform sedimentary environment, with mixed tidal flats, confined-evaporative platforms and open platform facies deposits developed in turn from west to east.(2) There are four types of intergrowth rock assemblages of Cambrian Gaotai Formation in the study area, including:thick-layered evaporite overlying dolomite, thick-layered dolomite interbedded with evaporite, interbedded dolomite and evaporite, and thick-layered dolomite overlying evaporite. The dolomite-evaporite paragenetic strata are developed at the contact interface of the fourth-order sequence, and are mostly developed in the highstand systems tract inside the sequence, reflecting a strong disturbance of sea level, especially the relative decline of sea level, which is conducive to the deposition of dolomite and evaporite. (3) The rock assemblage sequence of the dolomite-evaporite paragenetic strata of Gaotai Formation can generate response characteristics on the GRinpefa and wavelet transform curves. The corresponding 64-scale wavelet coefficient curve fluctuates smoothly, and the energy clusters are weak yellow-blue. The GRinpefa curve shows lithological difference between evaporite and dolomite in the form of "notch".

Key words: dolomite-evaporite paragenesis, maximum entropy spectral analysis, wavelet transform, high-frequency sequence division, Gaotai Formation, Cambrian, eastern Sichuan Basin

CLC Number: 

  • TE121.3+4
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