A method for depicting ancient karst underground rivers

A technology of karst and underground rivers, which is applied in seismic signal processing and other fields, and can solve problems that have not yet been studied on the characteristics of underground rivers

Active Publication Date: 2020-10-20
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] At present, the paleokarst underground river prediction technology is mainly based on the description of the shape of the underground river in a plane or three-dimensional way, and no relevant research has been carried out on the inner features of the underground river with the help of seismic waveform classification methods

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  • A method for depicting ancient karst underground rivers
  • A method for depicting ancient karst underground rivers
  • A method for depicting ancient karst underground rivers

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing.

[0026] A method for describing ancient karst underground rivers, comprising the following steps:

[0027] S10: Acquire the stacked migration seismic data of the reservoir, filter out the points corresponding to the seismic data whose amplitude energy is greater than or equal to the preset threshold, and project the selected points onto the horizontal plane to obtain paleokarst dark The projected profile of the river on the horizontal plane and the position of the projected profile on the horizontal plane.

[0028] Seismic attributes are parameters that characterize the geometric shape, kinematics, dynamics, and statistics of seismic waves derived from post-stack seismic data through mathematical transformation, such as amplitude, frequency, phase, polarity, velocity, and dip. like figure 1 As shown, the root mean square amplitude within 20-60ms at each point in the reserv...

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Abstract

The invention provides a method for describing a palaeo-karst underground river. A seismic waveform classified analysis technology is used to classify seismic waveforms in the distribution range of the palaeo-karst underground river, well points are combined to interpret characteristics of a reservoir body, and thus, growth features of the reservoir body in the underground river are described. Inthe practical seismic data interpretation process, the seismic waveform classified analysis method can be implemented completely without monitoring or with participation of wells, classification is carried out completely based on waveform difference of adjacent seismic traces, a well point interpretation result is calibrated, geologic interpretation is provided for a classification result, and further fine development of the oil field is guided.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration seismic reservoir prediction, in particular to a method for describing ancient karst underground rivers. Background technique [0002] Among the various types of oil and gas reservoirs that have been developed so far, channel development areas are mostly areas with favorable reservoir physical conditions, so the characterization and characterization of channels has always been a hot spot for reservoir geology and geophysics researchers. [0003] According to the difference of depositional environment, the channel can be divided into surface river deposition and underground river deposition. The channels of conventional clastic reservoirs are mainly surface river deposits. To carry out geological research on them, the corresponding sedimentary facies model can be established based on geological outcrops, and the specific channels can be determined according to seismic reservoir predic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 韩东邬兴威刘坤岩司朝年解丽慧王萍
Owner CHINA PETROLEUM & CHEM CORP
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