Detection method for fractured reservoirs

A detection method and reservoir technology, applied in the field of reservoir geophysical exploration, can solve the limitations of not fully utilizing the effective frequency band of seismic data, low prediction accuracy of fractured reservoirs and oil and gas reservoirs, and detection of smaller-scale faults and fracture zones and other problems, to achieve the effect of obvious geological effect, improved accuracy and simple calculation method

Active Publication Date: 2014-03-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Benefits of technology

This technology improves how accurate an analysis tool for exploring or studying underground formations helps identify areas where there may have been significant damage caused during drilling operations before they were completed. It also allows scientists to better interpret petroleum prospecting data from different types of boreholes at varying depth locations within their ground layers. Overall, this innovation enhances understanding about hydrocarbon production processes that might occur near these damaged sections.

Problems solved by technology

This patented technical problem addressed in the patents relates to improving the efficiency with regards to identifying small scale faults/fissurities within subterranean structures such as wellbore sedimentation basins and shale deposits. Current methods require expensive equipment and long periods of surveying before finding the best solutions.

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  • Detection method for fractured reservoirs
  • Detection method for fractured reservoirs
  • Detection method for fractured reservoirs

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with accompanying drawings and examples.

[0038] A method for detecting fractured reservoirs, specifically comprising the following steps:

[0039] 1) Use the surface seismic source and receiver to conduct seismic survey, obtain seismic data after processing, transform the seismic data into the frequency domain through Fourier transform, obtain the spectrum analysis diagram, and obtain the effective seismic frequency band range on the spectrum analysis diagram.

[0040] The target interval in the exploration area is the fractured carbonate reservoir in ancient buried hills. The original porosity and permeability of this kind of reservoir are very low, and the development of the reservoir is mainly controlled by fractures. A total of 4 wells in the area have drilled into the target intervals. Medium-high angle fractures are developed continuously or sporadically in the reservoir intervals of these 4 wel

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Abstract

The invention relates to a prediction method for fractured oil-gas reservoirs based on three-dimensional seismic data and a fractional-frequency ant body technology. The method comprises the following steps: transforming the seismic data to a frequency domain to obtain the scope of an effective seismic frequency band; starting from the minimum value of the effective seismic frequency band to increase at intervals to obtain a fractional-frequency data series; computing the phase spectrum of each sampling point to obtain a discrete fractional-frequency phase data volume; adopting an ant body algorithm to generate a series of fractional-frequency ant body data; conducting horizon picking on an objective reservoir to obtain the time structure data of each time point location of seismic reflected waves; respectively extracting numerical values corresponding to an objective interval from a series of fractional-frequency ant body data to obtain a group of fractured reservoir detection results of different frequency bands of the objective interval. The computing method is simple and convenient and can be used for detecting smaller scale of faults and fracture zones, the precision is higher, and the geological effect is obvious.

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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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