Quantitative Sequence Division and Lacustrine Level Change Based on Wavelet Analysis

doi:10.11885/j.issn.1674-5086.2021.08.30.02

Abstract

Abstract: The paleogene of Bohai Bay Basin has always been an important exploration target, which has great potential for oil and gas distribution and accumulation in Changdi Area. However, due to the complex structural conditions in this area, sequence, sedimentation, and other conditions are unknown. In order to explore the sequence development and lacustrine level change in this area, this paper divides the Dongying Formation in Changdi Area into 4 third-order sequences, 10 parasequence sets and 19 parasequences by means of high-resolution sequence division and quantitative sequence division through wavelet analysis. Fischer diagram is drawn on the basis of logging wavelet transform analysis, revealing the change of the accommodation space of Dongying Formation in Changdi Area, which approximately reflects the relative lacustrine level changes in the research area. The Dongying Formation in the research area shows a large-scale lacustrine regression and lacustrine transgression, and the process of small-scale lacustrine transgression and lacustrine regression within the Dongying Formation is consistent with the third-order sequence. In SQ₁ period, the relative lake level reached the maximum, during which there was a small-scale lake invasion and lake retreat, and then slowly lake retreat, reaching the minimum at the end of SQ₂. During SQ₃ period, the lake transgressed rapidly and then retreated rapidly, which fluctuated at a relatively low value. On the whole, the lake basin shrank and was covered by the delta plain.

Key words: Changdi Area, Dongying Formation, sequence division, wavelet analysis, relative lacustrine level change

CLC Number:

TE121

DONG Huoxiang, LIU Jingyan, CHEN Zhaoqin. Quantitative Sequence Division and Lacustrine Level Change Based on Wavelet Analysis[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(5): 57-68.

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