Six-stage modeling method for classification and characterization of gas layer quality in multi-layer sandstone gas reservoirs

Abstract

The invention discloses a modeling method for quality classification representation of multiple sandstone gas reservoir gas layers, and relates to a six-stage modeling method. A new method of two-layer construction modeling, two-level secondary-phase modeling and four-type reservoir property modeling is proposed according to multi-layer-steamed-bread-shaped multi-layer sandstone gas reservoir planar sedimentary stability and a multi-layer structure formed by a vertical sand mud interbed, a six-stage modeling method system including stratum construction modeling-sand body structure modeling-sand body microfacies modeling-storage-collection phase modeling-reservoir property modeling-gas layer quality classification modeling is built, and accurate quantitative representation of the multi-layer-steamed-bread-shaped multi-layer sandstone gas reservoir gas layer quality in three-dimensional space is achieved. Compared with a gas reservoir model built with a traditional three-stage modeling method, the multi-layer sandstone gas reservoir gas layer quality classification model obtained with the six-stage modeling method is more accurate and exquisite, and is widely applicable to meeting the urgent requirement for gas reservoir classification balance development in the middle and later periods of multi-layer sandstone gas reservoir development.

Description

technical field [0001] The invention relates to a six-stage modeling method, in particular to a six-stage modeling method for the classification and characterization of gas layer quality in multi-layer sandstone gas reservoirs. Background technique [0002] At present, there is no modeling method specifically aimed at the classification and characterization of multi-layer sandstone gas reservoir gas layer quality at home and abroad. When establishing a multi-layer sandstone gas reservoir model, people mainly use the traditional structural modeling-sedimentary facies modeling-reservoir A Three-Stage Modeling Approach for Layer Attribute Modeling. [0003] The shortcomings of the traditional three-stage modeling method of structure-sedimentation-reservoir attributes for the classification and characterization of gas layer quality in multi-layer sandstone gas reservoirs are reflected in the following three aspects: (1) Multi-layer sandstone gas reservoirs are characterized by s...

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Problems solved by technology

This method is obviously difficult to adapt to the increasingly high precision requirements for gas reservoir description in the middle and late stages of multi-layer sandstone gas reservoir development

[0004] Multi-layered sandstone gas reservoirs belonging to the shore-shallow lake (marine) subfacies are widely developed in Qinghai Oilfield, Changqing Oilfield, Sichuan Gas Field, Xinjiang Oilfield, Daqing Oilfield, Shengli Oilfield, etc., and most of these gas reservoirs have entered the In the middle and late stages of development, the pressure of sustained and stable production of gas reservoirs is increasing, and it is urgent to adopt new technologies to realize the classification and characterization of gas reservoir quality. However, it is still difficult to meet the actual needs in terms of the fineness of the modeling results

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