Three-dimensional lithofacies data processing method and device for fluvial low-permeability tight sandstone reservoirs

Abstract

The invention provides a method and device for processing three-dimensional lithofacies data of a fluvial-facies hypotonic compact sandstone reservoir and relates to the technical field of oil and gas development. The method for processing the three-dimensional lithofacies data of the fluvial-facies hypotonic compact sandstone reservoir comprises the steps that the main variation function for lithofacies is obtained according to the length parameter, the width parameter, the thickness parameter and the source direction parameter of a sand body; a natural gamma field is obtained according to a natural gamma curve and seismic data; a natural gamma model under the constraint of the main variation function for lithofacies is established by means of the sequential Gauss simulation method according to the natural gamma curve and the natural gamma field; a sandstone probability body is generated according to the corresponding relation between the natural gamma model and the sandstone probability; a three-dimensional training image is established, and a lithofacies model is established according to the three-dimensional training image, the lithofacies data of a well point and the sandstone probability body according to the multi-point geostatistics method. According to the method for processing the three-dimensional lithofacies data of the fluvial-facies hypotonic compact sandstone reservoir, the problem that oil and gas development is affected due to the fact that the geological condition of the reservoir can not be simulated easily according to a simple one-step modeling method can be solved.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas development, in particular to a three-dimensional lithofacies data processing method and device for fluvial low-permeability tight sandstone reservoirs. Background technique [0002] In the field of oil and gas development technology, it is generally necessary to model various reservoirs to simulate the underground geological conditions and provide a guarantee for the subsequent development of oil and gas. At present, most of the models used to model various reservoirs are constrained by relatively basic a priori geological data. This modeling method can only be applied to reservoirs with relatively simple structures. The current reservoirs are generally more complicated, each reservoir is buried deep, and the quality of seismic data is not good. Unstable, frequent interaction of sand and mudstone. [0003] In this way, the current modeling method involves less geological data,...

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Problems solved by technology

[0004] Embodiments of the present invention provide a three-dimensional lithofacies data processing method and device for fluvial low-permeability tight sandstone reservoirs, so as to solve the problem that conventional geological modeling methods in the prior art are not suitable for complex fluvial low-permeability tight sandstone reservoirs. The three-dimensional lithofacies modeling of the reservoir is difficult to simulate the geological conditions of the reservoir, which affects the development of oil and gas

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