Method of quantitatively restoring maximum paleo-water depth of lake basin through seismic profiling

A technology of seismic profile and water depth, applied in the field of geological exploration, can solve the problem of lack of reliability of ancient water depth, and achieve the effect of real and reliable calculation results

Inactive Publication Date: 2016-11-09
QINGDAO INST OF MARINE GEOLOGY
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Based on previous studies, whether it is marine or continental strata, the

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  • Method of quantitatively restoring maximum paleo-water depth of lake basin through seismic profiling

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[0021] The invention provides a method for quantitatively restoring the maximum paleo-water depth in the qualitative historical period of a continental lake basin by using a three-dimensional seismic profile. During the geological history period, the delta deposits of the continental lake basin have obvious forward accumulation characteristics. After a long period of burial compaction, there is an obvious preproduct reflection structure on the seismic section along the delta accumulation direction. The delta front product reflection structure is characterized by the obvious structure of the top, front and bottom layers. On the seismic profile, the delta front product has an obvious "S-shaped" front product reflection structure, and the delta front product thickness during the deposition period It is approximately equal to the water depth at that time, and the maximum water depth of the lake basin at this time is at least greater than this water depth. Therefore, the maximum pale...

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Abstract

The invention discloses a method of quantitatively restoring the maximum paleo-water depth of a lake basin through seismic profiling, comprising the following steps: (1) a 3D seismic profile deltaic progradational reflection configuration is found, and the top interface time t1 and the bottom interface time t2 are calibrated; (2) the top interface time and the bottom interface time are converted into corresponding top and bottom interface depth H1 and H2 through a time depth conversion scale; (3) the average sandstone thickness h1 and the average mudstone thickness h2 in a 3D seismic profile progradational layer are calculated; (4) the sandstone compaction rate K1 and the mudstone compaction rate K2 are obtained using a graphical method or an experimental method; and (5) before compaction, the sandstone thickness h10=h1/(1-K1), the mudstone thickness h20=h2/(1-K2), and the total thickness of the formation before compaction h0=h10+h20, namely, in the delta sedimentation period, the paleo-water depth thickness of the lake basin is h0, and the maximum paleo-water depth h of the lake basin at the moment is greater than or equal to h0. Through the method, the maximum paleo-water depth of a continental lake basin in the geological history period can be restored quantitatively, and the calculation result is real and reliable and is unique.

Description

technical field [0001] The invention belongs to the technical field of geological exploration, and in particular relates to a method for quantitatively restoring the maximum ancient water depth in the geological history period of continental lake basins by using three-dimensional seismic sections. Background technique [0002] Paleo-depth is an important research content of paleo-sea level restoration and basin analysis, but the quantitative determination of paleo-depth is still in the groping stage. Foreign scholars initially used methods such as paleontology, geochemistry, seismology, and mathematical modeling to semi-quantitatively determine the paleowater depths of marine carbonate rock platforms and deltas, such as Chappell et al. (1991) and Lawrence (1993) through C 14 The water depth, sea level and glacier melting level changes of the Huon Peninsula coral reefs were discussed with the U-Th method for more than 10,000 years; Bard et al. (1996) studied Barbados Tahiti b...

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IPC IPC(8): G01V1/30
CPCG01V1/308
Inventor 邵珠福栾锡武钟建华柳成志
Owner QINGDAO INST OF MARINE GEOLOGY
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