Method for grading evaluation of tight sandstone gas resource

Abstract

The invention relates to a method for grading evaluation of an oil field gas resource, in particular to a method for grading evaluation of a tight sandstone gas resource. The method comprises the specific steps that a tight reservoir sample is collected, porosity and permeability are actually measured, and a water saturation well logging calculation model is built; an effective porosity well logging calculation model is built through the actually-measured porosity; a permeability calculation model is built according to the relation between the actually-measured porosity and the actually-measured permeability; tight sandstone gas stored energy evaluation parameters are created according to well logging calculation data obtained through the previous steps. According to the method for grading evaluation of the tight sandstone gas resource, microscopic features of a tight reservoir are fully utilized, the method for grading evaluation of the resource is established from the perspective of the unconventional hydrocarbon accumulation enrichment characteristic on the basis of changes in pore structures, the stored energy evaluation parameters with the consideration of the hydrocarbon accumulation capacity and the seepage capacity are created, and the scientific and effective method is provided for grading evaluation of the tight sandstone gas resource.

Description

Technical field [0001] The invention relates to a method for grading evaluation of oil field gas resources, in particular to a method for grading evaluation of tight sandstone gas resources. Background technique [0002] Tight sandstone gas is a new field of unconventional oil exploration and development in the world. The United States is the first to achieve breakthroughs in this field through advanced technologies such as well pattern infill, large-scale fracturing, and multi-layer completion. However, the background of tight sandstone gas accumulation in my country There are still big differences abroad. Except for the Sulige Gas Field in the Ordos Basin and the Xujiahe Formation Gas Field in Sichuan, the tight sandstone gas in other basins has not yet achieved large-scale commercial exploitation. Especially for some small and medium-sized basins, the common problem is that although tight gas is found, most of the initial exploratory wells have the outstanding problem of extre...

AI Technical Summary

Problems solved by technology

Except for the Sulige gas field in the Ordos Basin and the Xujiahe Formation gas field in Sichuan, the tight sandstone gas in other basins has not yet achieved large-scale commercial exploitation

Especially for some small and medium-sized basins, the common problem is that although tight gas is found, most of the initial exploration wells have the outstanding problem of extremely rapid production decline, and there is no effective method to screen relatively high-quality tight gas resources from low-permeability tight gas resources. part

[0003] Existing evaluation methods for tight sandstone gas resources include analogy method, single well reserve estimation method, volumetric method, discovery process method and resource spatial distribution prediction method, etc., but they are all relatively rough evaluation methods from the perspective of evaluation principles, and The amount of resources evaluated by various methods is the total amount of resources, and there is a lack of standards for evaluating tight sandstone gas resource grades

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