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Formation pressure prediction method and lithologic oil reservoir evaluation method

A technology of formation pressure and prediction method, which is applied in the field of formation pressure prediction and lithologic reservoir evaluation, can solve the problems of inaccurate evaluation results and low prediction accuracy of formation pressure, and achieve the effect of accurate oil and gas-bearing evaluation results and precise prediction

Active Publication Date: 2020-04-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a formation pressure prediction method to solve the problem of low prediction accuracy of the existing formation pressure; The problem of inaccurate evaluation results

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  • Formation pressure prediction method and lithologic oil reservoir evaluation method
  • Formation pressure prediction method and lithologic oil reservoir evaluation method
  • Formation pressure prediction method and lithologic oil reservoir evaluation method

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Embodiment Construction

[0065] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0066] Examples of evaluation methods:

[0067] A lithologic reservoir evaluation method of the present invention, such as figure 1 shown, including the following steps:

[0068] 1) Obtain the acoustic logging data, density logging data, VSP logging data and seismic wavelet data of the target interval.

[0069] The reflection coefficient is obtained from the acoustic logging data and the density logging data, and the initial synthetic seismic record is obtained by convolution of the reflection coefficient and the seismic wavelet data.

[0070] The formula for the initial synthetic seismic record is as follows:

[0071]

[0072] In the formula, Syn(lΔt) is the synthetic seismic record, Δt is the sampling interval of the reflection coefficient, l is the sampling number of the reflection coefficient, R(lΔt-jΔτ) is the reflection coefficient, Δτ is the samp...

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Abstract

The invention relates to the technical field of oil exploration and development, in particular to a formation pressure prediction method and a lithologic oil reservoir evaluation method. Convolution is carried out on acoustic logging data, density logging data and seismic wavelet data to obtain an initial synthetic seismic record and calibration is carried out on the initial synthetic seismic record according to VSP logging data to obtain a calibrated synthetic seismic record; a correction coefficient of interval transit time is determined according to the initial synthetic seismic record andthe corrected synthetic seismic record; a correction coefficient is determined according to logging information of the known well of a target interval, an acoustic logging curve is corrected, and thecorrection result is combined with three-dimensional seismic data to obtain an interval velocity data volume through an inversion method. The interval velocity of the area outside the drilling position or the interval velocity of the position can be accurately determined and thus prediction of the formation pressure is more accurate, and finally the oil-containing gas evaluation result obtained according to the formation pressure is more accurate.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, in particular to a formation pressure prediction method and a lithologic reservoir evaluation method. Background technique [0002] With the deepening of oil and gas exploration and development, the main exploration targets are lithology and fault-lithology reservoirs. Formation pressure is the manifestation of formation energy and the driving force for oil and gas to flow in the reservoir. Abnormal formation pressure is a common geological phenomenon in oil and gas basins, and it is closely related to the generation, migration and accumulation of oil and gas. Studying the change of formation pressure is conducive to the study of oil and gas migration direction, accumulation process, distribution law, and evaluation of oil and gas in traps. [0003] Since abnormal pressure, especially abnormal high pressure is not only related to the oil and gas content of traps, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 张永华苏建栋杜伟李锋赵雨晴张驰严移胜卜旭强岳欣欣胥玲李丽娟
Owner CHINA PETROLEUM & CHEM CORP
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