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Stratum aperture pressure prediction method based on variety earthquake attributes

A technology of formation pore pressure and prediction method, applied in the field of oil and gas geophysical exploration, can solve problems such as inaccurate prediction of formation pore pressure, and achieve the effect of improving prediction accuracy

Inactive Publication Date: 2016-03-30
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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Problems solved by technology

In summary, the above two methods are based on the establishment of a single seismic attribute and the prediction of formation pore pressure, and the prediction effect has a great correlation with the seismic layer velocity. Once the seismic layer velocity is inaccurate, it will lead to formation pore pressure. inaccurate forecast

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  • Stratum aperture pressure prediction method based on variety earthquake attributes
  • Stratum aperture pressure prediction method based on variety earthquake attributes
  • Stratum aperture pressure prediction method based on variety earthquake attributes

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Embodiment Construction

[0045] The present invention can process two-dimensional seismic data and three-dimensional seismic data, and the specific steps include:

[0046] Step 1. According to the data obtained from the well logging, the P-wave velocity V, porosity φ, gamma value GR, density ρ, depth h and formation pore pressure P of the sand-shale section are selected. f .

[0047] According to the calculation formula of the overlying formation pressure Calculate the overlying formation pressure. Among them, h represents the depth of the overlying stratum, ρ(h) is the corresponding density when the depth is h, and g is the gravitational acceleration.

[0048] Calculate the effective stress P according to the compaction balance equation e , P e =P ov -βP f , P f is the formation pore pressure obtained from well logging, and β is the Biot coefficient. We use the linear Biot coefficient model based on the critical porosity for its calculation formula:

[0049]

[0050] where φ c is the cr...

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Abstract

The invention provides a stratum aperture pressure prediction method based on variety earthquake attributes, which indirectly constructs the non-linear relation between the stratum aperture pressure and the variety earthquake attributes and realizes the prediction of the stratum aperture pressure. The advantages of the invention reside in two aspects. On one hand, the invention comprehensively uses variety earthquake attributes, and deducts other influence factors, like porosity, shale content, etc, while utilizing the inversed longitudinal wave speed to carry out stratum aperture pressure prediction so as to improve the prediction accuracy; on the other hand, the invention creatively uses two calculation methods to obtain the longitudinal wave speed, obtain the target sand-mud stratum longitudinal wave speed through high precision wave impedance inversion and the obtains the background longitudinal wave speed by using the DIX formula inversion. The former can relatively accurately inverts the longitudinal wave speed inside the target stratum so as to relatively calculate the effective stress Pe inside the target layer; and the later can reflect the relation between the longitudinal wave speed and the density as a whole so as to accurately calculate the overlying strata pressure Pov.

Description

technical field [0001] The invention belongs to the technical field of oil and gas geophysical exploration, in particular to a method for predicting the pore pressure of sand and mudstone formations based on multiple seismic attributes. Background technique [0002] Formation pore pressure is one of the basic data in petroleum exploration and development. The prediction research of formation pore abnormal pressure (especially abnormal high pressure) has attracted more and more attention. In oil and gas geophysical exploration, formation pore pressure provides important information for the distribution, migration and storage of oil and gas; in oil drilling engineering, formation pore pressure is not only the basis for determining the drilling fluid density and well depth Safe, fast and economical drilling can even affect the success or failure of drilling. [0003] In general, formation pore pressure prediction methods can be divided into two categories, one is to use loggin...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/303G01V1/306
Inventor 熊晓军李良泉侯秋平杨瑞齐
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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