Method and device for determining TOC content

A technology of content and saturation, applied in the field of petroleum geophysical exploration, can solve problems such as large error in prediction results, low longitudinal accuracy, and no effective solution proposed

Active Publication Date: 2015-12-16
PETROCHINA CO LTD
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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 perspectiv

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  • Method and device for determining TOC content
  • Method and device for determining TOC content
  • Method and device for determining TOC content

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Embodiment Construction

[0101] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0102] The inventor considers that the existing methods for determining the TOC content have relatively large errors mainly due to the following problems:

[0103]1) The laboratory measurement data are not fully utilized. In addition to the analysis data of rock sample TOC content, the influence of microscopic data such as mineral composition content and physical property parameters on the estimation of TOC content is not considered;

[0104] 2) No suitable petrophysical model has been established;

[0105] 3) There are very few seismic prediction techniques for the TOC content of effective so...

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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...

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Application Information

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IPC IPC(8): G01V1/28G01V1/48G01N23/20G01N33/24
Inventor 赵万金闫国亮杨午阳刘炳杨
Owner PETROCHINA CO LTD
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