Reservoir thickness prediction method based on three seismic attributes

Abstract

The invention provides a reservoir thickness prediction method based on three seismic attributes. A wedge-shaped body geologic model is built according to work area seismic logging information, and areflection record is subjected to convolution and forward modeling to obtain a relation curve of the reflection amplitude, the time thickness, the center frequency and the true thickness of a reservoir; the relation curve is combined with three attribute theoretical curves to obtain an expression, with a linear relation attribute, similar to the true thickness of the reservoir is obtained by usinga mathematical optimization method; the attributes of the researched reservoir are calculated on the basis of actual seismic data, and the attributes are corrected according to thickness informationof each well drilling point of the reservoir so as to obtain a reservoir thickness plane prediction result. The method can improve the reservoir thickness prediction precision, reduce the oil field development risk and improve the accuracy of calculation of reserves is improved, and is an effective fine research means for lithological oil and gas reservoirs.

Description

technical field [0001] The invention relates to geophysical exploration technology, in particular to a reservoir thickness prediction method based on three seismic attributes. Background technique [0002] In the development process of lithologic reservoirs, the prediction results of reservoir thickness directly affect the calculation of oilfield reserves and the deployment of development wells. The conventional thickness prediction method first tracks and interprets the reflection time of the top and bottom of the reservoir, and the difference between the two is the reflection time. Then the actual drilling thickness at the drilled point of the reservoir is used to correct the time thickness, and the prediction result of the reservoir thickness plane is obtained. The premise of this method to achieve good results is that the thickness of the reflection time of the reservoir has a linear relationship with the true thickness. In fact, this relationship is only approximately t...

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Problems solved by technology

[0003] The main purpose of the present invention is to overcome the above-mentioned shortcoming existing in the prior art, and provide a kind of reservoir thickness prediction method based on seismic three attributes, solve the problem existing in the conventional method that only utilizes time thickness attribute to carry out reservoir thickness prediction, improve thickness Prediction accuracy

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