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Method for simultaneously inverting porosity and shaliness by using seismic wave velocity

A technology of shale content and porosity, which is applied in the fields of seismology and seismic signal processing for well logging records, and can solve problems such as the inability to guarantee the lateral resolution of shale content profiles and the small number of wells drilled

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, although the logging data has a relatively high resolution, the number of wells drilled in the exploration area is often small, and the lateral resolution of the shale content profile obtained by interpolation cannot be guaranteed.

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  • Method for simultaneously inverting porosity and shaliness by using seismic wave velocity
  • Method for simultaneously inverting porosity and shaliness by using seismic wave velocity

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Embodiment Construction

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

[0047] Based on the principles of rock physics methods, the present invention establishes the functional relationship between velocity, porosity and shale content, constructs the objective function between the measured velocity and the theoretically calculated velocity, and utilizes an optimization algorithm with global optimization capability to optimize the objective function. Carry out inversion, and finally get the porosity and shale content.

[0048] like Figure 4 Shown, the concrete steps of the present invention are as follows:

[0049] (1) Calculate the equivalent bulk modulus of the rock skeleton composed of sandstone and mudstone, which is calculated by formula (1):

[0050] K p0 =[V sh K sh +V s K s +1 / (V sh / K sh +V s / K s )] / 2(1)

[0051] In the formula, K sh and K s are the bulk moduli of mudstone and sandstone, V sh and V s are the volu...

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Abstract

The invention provides a method for simultaneously inverting porosity and shaliness by using seismic wave velocity and belongs to the field of exploration and development of oil and gas. The method comprises the following steps: (1), inputting basic data;(2), generating feasible solutions of porosity phi and shaliness beta in the value ranges of the porosity and the shaliness; (3), calculating equivalent bulk modulus Kp00 of a rock framework; (4), calculating longitudinal wave velocity Vp0 of the rock framework; (5), calculating longitudinal wave velocity Vp of rock; (6), establishing an objective function f (phi, beta) simultansously inverting the shaliness and the porosity according to the longitudinal wave velocity Vpi and the longitudinal wave velocity Vp of the rock which are obtained by inversion of seismic amplitude data; (7), performing iterative inversion on the objective function by using a non-linear global optimization algorithm till the produced feasible solutions of the porosity and the shaliness enable the values of the objective function to meet a terminating condition; (8), outputting the feasible solutions of the porosity and the shaliness, which meet the terminating condition, namely the finally calculated porosity and the shaliness.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration and development, and in particular relates to a method for simultaneously inverting porosity and shale content by using seismic wave velocity. Background technique [0002] Seismic exploration method is a geophysical method that analyzes and predicts the distribution range of oil and gas reservoirs and the physical characteristics of reservoirs by using the changes in the velocity, amplitude, frequency, phase, waveform and other parameters of seismic waves propagating in different underground media. The most widely used method in geophysical prospecting. With the continuous advancement of oil and gas exploration and development, conventional oil and gas exploration has shifted from the original search for structural oil and gas reservoirs to the search for lithologic oil and gas reservoirs and hidden oil and gas reservoirs, and unconventional oil and gas exploration and develop...

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Application Information

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IPC IPC(8): G01V1/48G01V1/50
Inventor 白俊雨
Owner CHINA PETROLEUM & CHEM CORP
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