Abstract:

Natural gamma-ray loging is one of the conventional loging methods used in petroleum industry. It can be used to identify rock lithology and analyze sedimentary facies quantitatively. This paper mainly describes a methld for quantitative analysis and recognition of fan-deltaic microfacies by means of the natural gamma ray log. Certain computer mathematical methods are adopted to establish the frequency and deviation patterns for the recognition of fan-deltaic sedimentary microfacies. This makes it possible for a computer to recognize and divide microfacies zones, and plot facies relationship maps and make quantitative analysis of sedimentary facies.
The method introduced in this paper is of wide practical value in petroleum industry.