Method for improving prediction precision of thin sandstone reservoir
A technology for reservoir prediction and sandstone, which is applied in the field of improving the prediction accuracy of thin sandstone reservoirs and can solve problems such as large workload and the like
Pending Publication Date: 2020-10-30
SENUO TECH CO LTD
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Problems solved by technology
There are two constraints in pre-stack seismic reservoir prediction: one is that the workload is very large; the other is that pre-stack data volumes need to be specially processed
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Embodiment 1
[0038] The method for improving the prediction accuracy of the thin-bed sandstone reservoir described in this embodiment includes:
[0039] (1) Conventional wave impedance inversion to form wave impedance data volume;
[0040] Since wave impedance is less sensitive to thin reservoirs and has a lower resolution, it is impossible to directly predict thin reservoirs. This data volume can be used for trend volumes in the subsequent co-simulation process.
[0041] (2) Use the reservoir characteristic curve to divide the single well sand and mudstone profile, select the curves that are more sensitive to the reservoir, such as SP, GR, COND, etc., and divide the sand and mudstone by setting the cut-off value of the curve to distinguish sand and mudstone, forming discrete sand and mudstone Curve, mudstone is set to 0, sandstone is set to 1, as attached figure 1 , the dark color is mudstone, and the light color is sandstone. Because the purpose of this method is to predict the distribu...
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The invention belongs to the technical field of oil exploration and development, and particularly relates to a method for improving the prediction precision of a thin sandstone reservoir. For the thinsandstone reservoir, a geostatistical inversion method with higher resolution is adopted, and for the thin sandstone reservoir, wave impedance is difficult to effectively distinguish sandstone and mudstone, a reservoir characteristic curve is adopted to replace a conventional wave impedance curve to perform inversion; the wave impedance data volume is used as a co-simulation body to carry out co-simulation on the reservoir characteristic curve, and the formed characteristic curve data volume can well identify the thin reservoir because the characteristic curve resolution is high and the curvevalue has good correspondence with the sand mudstone; the thin sandstone reservoir prediction based on the post-stack seismic data volume is more universal and applicable, the method focuses on the post-stack seismic reservoir prediction, and the thin sandstone reservoir prediction precision is effectively improved by adopting a geostatistical inversion method with higher resolution.
Description
technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and in particular relates to a method for improving prediction accuracy of thin sandstone reservoirs. Background technique [0002] With the further improvement of oil and gas exploration and development, geological requirements for reservoir prediction accuracy are getting higher and higher. However, wave impedance is difficult to effectively distinguish sand and mudstone, which makes reservoir prediction difficult. At present, the research field of thin-bed sandstone reservoir prediction mainly focuses on the use of pre-stack data for rock geophysics, while post-stack seismic thin-bed sandstone reservoir prediction progresses slowly. There are two constraints in pre-stack seismic reservoir prediction: one is that the workload is very large; the other is that pre-stack data volumes need to be specially processed. Therefore, it is necessary to design a method that ...
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IPC IPC(8): G01V1/30G01V1/40
CPCG01V1/30G01V1/306G01V1/40G01V2210/6226G01V2210/624
Inventor 曲卫和石达友孔文良冯保华张志超杨斐然刘伟
Owner SENUO TECH CO LTD