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Formation pore pressure prediction method based on earthquake material

A technology of formation pore pressure and seismic data, applied in the field of oil and gas geophysical exploration, can solve the problems that do not meet the geological characteristics of shale gas low porosity and low permeability, and cannot meet the requirements of earthquake prediction, etc., and achieve the effect of high resolution

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] To sum up, most of the current pre-drilling prediction methods of formation pressure are based on the assumption of constant compaction of mudstone, and use seismic layer velocity data with low resolution to predict formation pressure; they do not meet the geological conditions of low porosity and low permeability of shale gas. characteristics, which cannot meet the requirements of pre-drilling earthquake prediction for abnormal pores in shale gas reservoirs

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  • Formation pore pressure prediction method based on earthquake material
  • Formation pore pressure prediction method based on earthquake material
  • Formation pore pressure prediction method based on earthquake material

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0047] figure 1 A flowchart showing a method for obtaining formation pore pressure according to an embodiment of the present invention.

[0048] Such as figure 1 As shown, the method for obtaining formation pore pressure according to the embodiment of the present invention includes the following steps.

[0049] Step setp1 describes the process of conventional post-stack wave impedance inversion. The input data includes the time-domain post-stack seismic data volume Seis(x,y,t) in the work area, and the depth domain logging data Well(z) in the work area. The implementation process includes four steps of logging seismic time and depth calibration, seismic inversion wavelet extraction, low-frequency initial model establishment and inversion parameter setting. At present, there are many ways to obtain P-wave impedance through seismic inversion based on post-stack seism...

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Abstract

The invention provides a formation pore pressure prediction method based on earthquake material and belongs to the field of oil-gas geophysical exploration. The method predicts formation pore pressure Ppore (x,y,t) based on depth domain log data Well (z) and post-stack time domain earthquake data Seis (x,y,t). z represents the depth domain and unit can be m or ft; x and y represent spatial positions corresponding to each earthquake channel, x,y coordinates or vertical-horizontal testing line sizes; and t represents the time domain and unit is s or ms. Pressure can be directly predicted based on impedance information and the method is characterized by high earthquake material resolution; a problem of inaccurate density parameters based on prestack inversion can be overlooked; and a stable and reliable formation pore pressure predicting result can be achieved.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysical exploration, in particular to a method for predicting formation pore pressure based on seismic data. Background technique [0002] Formation pressure is one of the basic data in petroleum exploration and development. The research on abnormal formation pressure (especially abnormal high pressure) has attracted more and more attention. In the process of oil exploration, the formation pressure provides important information for the distribution, migration and accumulation of oil and gas; , economic drilling, and even affect the success or failure of drilling. [0003] During the development of natural gas reservoirs, especially when developing oil and gas fields with abnormally high pressure formations, how to accurately predict formation pressure before drilling is particularly important. It is a forward-looking work for oil and gas exploration. Therefore, formation pressure prediction techn...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/06E21B49/00
Inventor 胡华锋毕进娜杨丽林正良滕龙
Owner CHINA PETROLEUM & CHEM CORP
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