Well logging characterization method, well drilling layer section selecting method and well drilling layer section selecting device of a sand body structure

Abstract

The invention provides a well logging characterization method, a well drilling layer section selecting method and a well drilling layer section selecting device of a sand body structure. The well drilling layer section selecting method comprises the steps of S1, selecting sampling point data of a natural gamma-ray well logging curve in a needed processing layer section and calculating a smooth degree GS of the natural gamma-ray well logging curve; S2, calculating an average value of shale contents in the processing layer section; S3, building a formula, which is as shown in the attached drawing, of well logging characterization parameters Pss of the sand body structure; S4, comparing the sand body structure differences of different processing layer sections according to Pss values, and selecting a processing section in a minimum Pss value as an optimized layer section; S5, carrying out optimization and well drilling development on an oil gas enrichment area of the sand structure according to the optimized layer section. The well logging characterization method, the well drilling layer section selecting method and the well drilling layer section selecting device of the sand body structure, provided by the invention can be used for quantitatively comparing the differences of reservoir sand body structures, have the advantages of simpleness, intuition, high distinguishing degree, good reliability and the like, and are capable of supplying technical support to the optimization and the well drilling development of the oil gas enrichment area in densification oil gas.

Description

technical field [0001] The invention relates to the technical field of well logging evaluation in oil and gas exploration, in particular to a well logging characterization method of sand body structure and a drilling layer selection method and device. Background technique [0002] In lithologic reservoirs, the oil-gas reservoir sand body refers to the oil-bearing sand body in the underground reservoir, which is composed of many irregular sand bodies. It is the smallest oil-bearing unit in the underground oil layer and the most basic unit to control the movement of oil and water. . Under different depositional environment conditions, the sand body structure of the reservoir is quite different, and it is important to distinguish the difference of the sand body structure of the reservoir well for the comprehensive evaluation and development research of oil and gas reservoirs. [0003] At present, in the field of oil and gas exploration, the natural gamma ray logging method is ...

AI Technical Summary

Problems solved by technology

[0004] The sand body structure of the reservoir can be qualitatively analyzed according to the amplitude and shape of the natural gamma ray logging curve, but due to the lack of specific logging parameters, this method cannot quantitatively analyze the sand body structure of different intervals in a single well or multiple wells , its subjective influence is large, the judgment result has a large error, and it is impossible to quantitatively compare and select different intervals of a single well or multiple wells and compare the difference in plane distribution of sand body structure, which affects the further development of the relationship between reservoir sand body structure and productivity. Research and selection of tight oil and gas "sweet spots" (hydrocarbon-rich areas) and favorable areas for drilling

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