Method and device for determining TOC content

Abstract

The invention provides a method and device for determining TOC content. The method comprises the following steps: establishing a TOC optimally-estimated mineral rock physical model by utilizing data of laboratory-measured X-ray diffraction data, organic carbon density and logging density curve and the like; obtaining accurate TOC distribution on a well through an optimization iteration method; establishing a TOC quantity version by utilizing actually-measured TOC data and an equivalent medium model; determining TOC sensitivity elastic parameters; and finally, carrying out prestack elastic parameter inversion on earthquake reflection gather obtained through OVT region processing. The method and device for determining the TOC content realize the purpose of quantitatively forecasting space distribution of the TOC content by utilizing well-seism integration through statistical fitting, and solve the problem of not high TOC content forecasting result; and through using the laboratory-measured data and the rock physical model effectively, the estimated result is not only matched with the laboratory-measured value at the places of rock samples, but also can predicate the TOC content at the places without sampling points accurately.

Description

technical field [0001] The invention relates to petroleum geophysical exploration technology, in particular to a method and device for determining TOC (Total Organic Carbon, total organic carbon) content. Background technique [0002] At present, seismic methods are mainly used to predict tight oil and gas reservoirs. Tight oil and gas have two characteristics: 1) Due to the tight lithology, low porosity and permeability, the distance for oil and gas to be drained and transported from source rocks is very short, so often Stored in reservoirs close to source rocks, that is, oil and gas have the characteristics of "short displacement and short migration"; 2) Since tight lithology is often complex in composition, it is both source rocks and reservoirs, so oil and gas are sometimes produced. In other words, oil and gas have the characteristics of "self-generation and self-storage". The above two characteristics of tight oil and gas determine that one of the main contents of tig...

AI Technical Summary

Problems solved by technology

Compared with the previous method, the biggest feature of this method is that it takes geological knowledge as the background, and can grasp the validity of the prediction results from a macro perspective, but the vertical accuracy is very low, and the error of the prediction results is larger

[0008] For how to improve the prediction accuracy of TOC content, no effective solution has been proposed so far

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