Seismic inversion reservoir stratum forecasting method for overthrust-containing complex structure

A technology for seismic inversion and reservoir prediction, which is used in seismology and seismic signal processing for logging records. The area increases, the inversion results are credible, and the effect is obvious

Inactive Publication Date: 2011-07-13
BC P INC CHINA NAT PETROLEUM CORP +1
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AI Technical Summary

Benefits of technology

This technology improves upon previous methods that were developed during early stages of drilling operations or exploitation activities. By starting from an external surface-to-inner fault region, this method saves effort compared to older models built earlier without considering it. Additionally, while traditional approaches like linear regression require multiple calculations per section (LRS) they also improve accuracy when calculating upward wall thicknesses due to their geometry. Overall, these improvements lead to improved efficiency and effectiveness in reservoiding underground resources such as hydrocarbons.

Problems solved by technology

This patented describes an improved way to estimate the depth from surface sources caused by subsidence events during oil drilling operations. Current techniques involve analyzing data obtained after wellbore excavations but they may fail when there were reversals involving fractures within the underlying rock mass due to imperfections like unevenness in sedimentary basins.

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  • Seismic inversion reservoir stratum forecasting method for overthrust-containing complex structure
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  • Seismic inversion reservoir stratum forecasting method for overthrust-containing complex structure

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Embodiment 1

[0030] The invention discloses a seismic inversion reservoir prediction method with overthrust faults in complex structures. The steps include:

[0031] (1) Extract the seismic wavelet w from well logs and seismic data i (t) or make theoretical seismic wavelet w i (t), the extracted seismic wavelet and the theoretical seismic wavelet are seismic wavelets obtained by different methods;

[0032] (2) According to the mathematical-physical model of convolution of seismic wave propagation, the synthetic seismic record Si(t)=wi(t)*Ri(t) is made with the log curve, wherein Si(t) is the synthetic seismic record, wi(t) is the seismic wavelet or theoretical seismic wavelet, * is the convolution operator, Ri(t) is the reflection coefficient sequence calculated from the logging curve;

[0033] Comparing the synthetic seismic record with the seismic section through the well, and determining the time-depth relationship between the seismic section and the logging curve;

[0034] (3) Impor...

Embodiment 2

[0038] On the basis of above-mentioned embodiment 1, the best implementation mode of the present invention is, in the seismic wavelet extraction in above-mentioned step (1), can adopt statistical method to extract seismic wavelet independently by seismic data, also can use correlation method to extract seismic wavelet by Seismic data, acoustic logging curves, and density logging curves are used to extract seismic wavelets. The theoretical seismic wavelets can be Lake wavelets or bandpass wavelets. In the above step (2), when comparing the synthetic record with the seismic section, first determine the initial area of ​​the interval corresponding to the synthetic record and the seismic section according to the geological stratification data and the initial velocity range of the seismic section, and then compare the synthetic record Calculate the correlation coefficient with the wave group characteristics of the seismic section. The correlation coefficient is the name of a paramet...

Embodiment 3

[0040]Another specific embodiment of the present invention is as follows. Through the above description of the content of the present invention and the further description of the following implementation examples, those skilled in the art can achieve the purpose of the present invention. However, this embodiment is only a part of the present invention and should not be taken as limiting the scope of the present invention.

[0041] The purpose of the seismic inversion method with overthrust faults carried out below is to prove that the inversion result profile obtained by the principle of the present invention is larger than the seismic inversion result obtained by the conventional method, and the prediction of the fault area is more accurate.

[0042] According to the step (1) of the method for the present invention, the seismic wavelet wi (t) is extracted with the DU3 well and seismic data in the DKH work area, and the obtained results are as follows figure 1 shown. The hori...

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Abstract

The invention discloses a seismic inversion reservoir stratum forecasting method for an overthrust-containing complex structure, and relates to the technical field of a method for forecasting reservoir strata in oil-gas exploration and development. The method comprises the following steps of: (1) extracting seismic wavelets; (2) demarcating a geologic horizon by well logging data, and corresponding the time-depth relation of the well logging data and seismic data one by one; (3) importing a seismic interpretation horizon and a seismic interpretation fault, and establishing an initial model of seismic inversion by an overthrust-containing modeling method; (4) calculating an inversion result by a model-based inversion algorithm; and (5) performing seismic interpretation on the seismic inversion result. When the method is used, the seismic inversion of the reservoir strata of the overthrust-containing complex structure makes the breaking points distinct and the heading side data of the fault credible and increases the forecastable area, and the problem that the fault area of the seismic inversion reservoir stratum forecasting of the overthrust-containing complex structure in the conventional seismic exploration is difficult to interpret is solved.

Description

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Claims

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Application Information

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Owner BC P INC CHINA NAT PETROLEUM CORP
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