Stratigraphic sequence division method and device

Abstract

The present invention provides a stratigraphic sequence division method and a device. The method comprises the steps of according to the seismic reflection characteristics of a seismic profile, identifying a two-level sequence interface and a three-level sequence interface; respectively positioning the two-level sequence interface and the three-level sequence interface at the corresponding depths of a well logging in the seismic profile; subjecting the logging curve of the well logging at the corresponding depth point of the two-level sequence interface to primary reconstruction to generate a first-level reconstruction curve; subjecting the first-level reconstruction curve at the corresponding depth point of the three-level sequence interface to secondary reconstruction to generate a secondary reconstruction curve; and subjecting the secondary reconstruction curve to wavelet analysis according to a preset scale so as to generate a stratigraphic sequence division result. According to the technical scheme of the invention, based on the long-term and accurate identification of stratigraphic sequences, the medium-term and long-term low-frequency sequence division results and the short-term high-frequency sequence division results of a sequence curve are ensured to be accurate and reliable. The logging curve is reconstructed twice to obtain a secondary reconstruction curve based on seismic data, and the wavelet transform analysis at different scales is conducted. Therefore, the true combination of well-log and seismic data during the stratigraphic sequence dividing process is realized.

Description

technical field [0001] The invention relates to exploration technology, in particular to a stratigraphic sequence division method and device. Background technique [0002] Sequence stratigraphy has been widely used in the exploration and development of oil and gas fields. How to accurately divide the sequence is the most basic and important link in the study of sequence stratigraphy. Accurate sequence division is the basis for sedimentary cycle analysis and sedimentary environment research, and is of great significance to the study of strata filling models and sedimentary facies. A sequence is a set of relatively complete, genetically related strata whose top and bottom surfaces are bounded by unconformity surfaces or integration surfaces comparable to these unconformity surfaces, reflecting the result of periodic sea level rise and fall in nature . Sequence reflects the transformation of sedimentary cycle. The long-period sedimentary cycle has a more obvious response on t...

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Problems solved by technology

[0008] In order to solve the problem that the long-period low-frequency sequence cannot be accurately identified in the prior art, the present invention proposes a method for identifying sequences of different levels using different scales to divide the sequence. The embodiment of the present invention provides a stratum Sequence division methods, including:

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