Prestack inversion method based on seismic restrained modeling

A pre-stack inversion and inversion algorithm technology, applied in the field of petroleum exploration, can solve the problem of not considering the wavelet factors, and achieve the effect of improving the accuracy of data and describing the development law accurately.

Inactive Publication Date: 2014-04-09
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

Traditional methods such as phase rotation, trace integration, and recursive inversion do not consider wavelet factors, which is equivalent to not establi

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  • Prestack inversion method based on seismic restrained modeling
  • Prestack inversion method based on seismic restrained modeling
  • Prestack inversion method based on seismic restrained modeling

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Embodiment 1

[0042] figure 1 It is the carbonate reservoir core photo (a), field outcrop (b) and typical seismic section (c), obviously this kind of carbonate reservoir and background matrix are distributed randomly and interactively in space, heterogeneity Extremely strong, it is difficult to establish a realistic geological model to guide the inversion, which ultimately makes the reservoir and fluid prediction inaccurate.

[0043] figure 2 and image 3 They are the full stacking and pure P-wave profiles of a typical well in a well area in the Tarim Basin for carbonate reservoirs. It can be seen that after the AVO effect of the latter is removed, the resolution increases and the reservoir is more clearly described. However, traditional methods such as "facies-controlled modeling", "karst modeling" and "reservoir facies modeling" are all based on full-stack data volumes, which are obviously not accurate enough. However, the accuracy of attribute analysis and reservoir prediction will ...

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Abstract

The invention relates to a prestack inversion method based on seismic restrained modeling. Prestack inversion results are directly determined by the quality of a constraint model, but a model for strong anisotropic carbonate reservoirs can not be quantitatively established through the facies-controlled modeling method or the karst modeling method or the reservoir facies modeling method or the like; in addition, follow-up inversion and reservoir prediction are not accurate due to errors existing in routine basic data of the methods. According to the prestack inversion method, based on prestack amplitude preservation gathering, firstly, the AVO effect is removed through the pure longitudinal wave extraction technology so as to improve data accuracy and then a quantitative model reflecting secondary reservoir distribution rules is established through relative impedance and logging data obtained through color inversion so as to instruct inversion. As is shown in actual data application, development details of secondary carbonate reservoirs can be depicted more clearly through prestack inversion results based on seismic restrained modeling. The prestack inversion method has the advantages that the prestack inversion method can be directly applied to actual data, and particularly development rules of reservoirs in deep zones without wells can be depicted more accurately through the prestack inversion method.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, in particular to a pre-stack inversion method based on seismic constraint modeling, which is suitable for prediction of strongly heterogeneous carbonate rock reservoirs. Background technique [0002] In recent years, significant progress has been made in deep carbonate oil and gas exploration in the Tarim Basin. During the 11th Five-Year Plan period, four high-efficiency oil and gas development zones including Lungu, Yingmaili, Halahatang and Tazhong I have been preliminarily established (Tarim Petroleum News, 2011). The oil equivalent of proven and controlled reserves of carbonate rocks has already accounted for half of the reserves of the entire oilfield, and the annual output of crude oil has exceeded 1 million tons, basically having a resource base of annual output of 3 million tons (Xinjiang News Online, China Pipeline Business Network, etc., 2012) , showing great exploration prospects....

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 张远银孙赞东
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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