Accurate comparison method for delta front sedimentary strata bottom surfaces at same elevation

Abstract

The invention discloses an accurate comparison method for delta front sedimentary strata bottom surfaces at the same elevation. The accurate comparison method comprises the following steps: defining a plurality of isochronous surfaces in a delta front sedimentary strata section; analyzing the elevations of a single sand body bottom surface and the nearest isochronous surface under the control of the sedimentary compensation principle, and determining that sand bodies are the same or deposited contemporaneously if the elevations are the same; carrying out closed examination and planar examination. According to the method, the strata time of the single sand body level can be determined scientifically and reasonably; the division can be more accurate; the comparison result fits an underground geological condition better; the guiding significances in petroleum reservoir exploitation and recovery efficiency improvement are high.

Description

technical field [0001] The technology belongs to the field of stratigraphic division and comparison, and specifically relates to a method for comparing elevation accuracy of the bottom surface of delta front facies sedimentary strata. Background technique [0002] Stratigraphic division and correlation is the basis of reservoir geological research. At present, the fine correlation methods of delta front facies sedimentary strata mainly include high-resolution sequence stratigraphy method, cycle method and equal thickness method, etc., and there is the scale effect of the main problem correlation, that is, the accuracy at the sand group level is relatively high, to The comparison results of the above methods at the sublayer level are basically the same, but at the single sandbody level, the multiplicity of solutions is strong and the uncertainty increases. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention ...

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Problems solved by technology

At present, the fine correlation methods of delta front facies sedimentary strata mainly include high-resolution sequence stratigraphy method, cycle method and equal thickness method, etc., and there is the scale effect of the main problem correlation, that is, the accuracy at the sand group level is relatively high, to The comparison results of the above methods at the sublayer level are basically the same, but at the single sandbody level, the multiplicity of solutions is strong and the uncertainty increases

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