Foreland basin deep buried and compressed type complex gypsum-salt rock identification and distribution prediction method

Abstract

The invention provides a foreland basin deep buried and compressed type complex gypsum-salt rock identification and distribution prediction method. The method comprises the following steps that: according to lithological vertical change in outcrop data, drilling data and logging data, a lithological sequence caused by sedimentary environment change is reserved, and a gypsum-salt rock deformation and overlying sequence caused by tectonic compression and fault repetition is eliminated, and an original lithologic sequence is established, and an ancient landform model of a research area is recovered through the original lithologic sequence, and a current tectonic model is recovered; and three-dimensional gravity, magnetic, electric and seismic joint inversion is carried out, and lithological and lithofacies interpretation of gypsum-salt rock at the surrounding region of a borehole is carried out through electrical methods, seismic facies and density anomaly and by means of the original lithologic sequence and the current tectonic model, and therefore, a lithological sequence plane distribution rule can be determined. According to the method provided by the invention, based on foreland basin gypsum-salt rock deformation characteristics which are obtained through geologic modeling, and geophysical methods such as three-dimensional gravity, magnetic, electric and seismic methods are adopted to perform joint inversion, and therefore, the distribution characteristics of post-deformation gypsum-salt rock can be accurately determined.

Description

technical field [0001] The invention relates to a method for identifying and predicting the distribution of deep-buried and extruded complex gypsum-salt rock layers in foreland basins, and belongs to the technical field of oil exploitation and geological exploration. Background technique [0002] Gypsum-salt rock is a chemically-genetic sedimentary rock that is formed after the evaporation of water and the gradual concentration of salt, also known as "evaporite". In my country's sedimentary basins, a large number of gypsum-salt rocks were distributed in the Cambrian, Ordovician, Triassic, Cretaceous and Paleogene periods. Used in chemical industry, medicine, agriculture, glass, explosives and other fields, it is a scarce mineral resource, which is of great significance to national economic construction and resource security. In addition, gypsum-salt rocks are generally non-permeable layers, and many large and super-large oil and gas fields often use extremely thick gypsum-sa...

AI Technical Summary

Problems solved by technology

Therefore, this superposition can lead to multiple gypsum-salt rock formations spaced apart from each other vertically, which cannot be accurately predicted by the above-mentioned existing geophysical well detection methods.

Secondly, the signal-to-no...

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