Reliability Evaluation of Seismic Oil and Gas Detection Attributes and Judgment Method of Trap Fluid Interface
A technology of oil and gas detection and fluid interface, applied in seismic signal processing and other directions, can solve the problems of low reliability and large differences in the interpretation results of seismic oil and gas detection attributes, and achieve the effect of avoiding uncertainty and improving interpretation efficiency.
Active Publication Date: 2021-02-09
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is that at present, interpreters judge the attributes obtained by seismic oil and gas detection based on experience. Due to differences in professional knowledge and experience, different interpreters have large differences in the interpretation results of seismic oil and gas detection attributes and low reliability. A method for reliability evaluation of seismic oil and gas detection attributes and determination of trap fluid interface is provided. By defining two quantitative evaluation indicators of "seismic oil and gas detection change rate" and "seismic oil and gas detection matching degree", the seismic oil and gas detection attributes are objectively evaluated.
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[0026] Such as figure 1 As shown, the present invention provides a method for reliability evaluation of seismic oil and gas detection attributes and determination of trap fluid interface, including the following steps:
[0027] (1) Extract the seismic oil and gas detection attributes of the traps that need to determine the fluid interface, form the seismic oil and gas detection attribute map, and make the structural map of the trap, and then grid the seismic oil and gas detection attribute map and the structural map.
[0028] (2) Based on the gridded structural map, determine the altitude depth range of the trap, and take the highest point as the initial altitude depth d 1 , determine the altitude depth increment δ according to the accuracy requirements of the oil-water interface to be determined d , for the altitude depth increment δ d , the accuracy of the oil-water interface to be determined is also δ d .
[0029] Take the initial altitude depth d 1 and altitude depth ...
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The invention belongs to the technical field of petroleum exploration seismic oil and gas detection, and discloses a method for evaluating the reliability of seismic oil and gas detection attributes and judging the fluid interface of traps. Then determine the depth equivalent area, calculate the average value of seismic oil and gas detection attributes in each depth equivalent area, and determine the main distribution interval of attribute values, and then calculate the "seismic oil and gas detection change rate" and "seismic Matching degree of oil and gas detection”, and finally, based on the above two quantitative evaluation indicators, it is determined whether the seismic oil and gas detection attributes are reliable, and if reliable, the position of the fluid interface is given. The present invention defines two quantitative evaluation indexes of seismic oil and gas detection results, "change rate of seismic oil and gas detection" and "matching degree of seismic oil and gas detection". Quantitative prediction of trapped fluid interface locations.
Description
technical field [0001] The invention belongs to the technical field of petroleum exploration seismic oil and gas detection, and in particular relates to an evaluation method for seismic oil and gas detection results. Background technique [0002] As early as the 1970s, geophysicists had used seismic amplitude "bright spots" to find underground gas-bearing layers and achieved many successful examples. Since then, in order to overcome the limitations of this technology and detect oil and gas more effectively, various methods such as AVO technology, Poisson impedance, LMR technology, dispersion properties, low-frequency shadows, and low-frequency amplitude anomalies have been proposed successively. But so far, there is no reliable interpretation method for seismic oil and gas detection results. How to judge whether the test results are accurate, how to delineate the oil and gas range and determine the fluid interface according to the test results, usually interpreters judge th...
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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/30
Inventor 夏同星周东红王波明君刘垒彭刚田涛李文滨周建科周学锋
Owner CHINA NAT OFFSHORE OIL CORP