A method for identifying sedimentary facies using lithological combination

Abstract

The invention relates to a method utilizing lithological combination identification sedimentary facies. The method comprises the following steps that S1, the lithological combination index of a study layer section is collected and processed; S2, the depositional environment is judged utilizing the mudstone color index; S3, sedimentary facies belt is judged utilizing the mudstone thickness index; S4, the material source stability is judged utilizing the sandstone thickness disparity; S5, the study layer section lithology is judged utilizing the lithology index; S6, the hydrodynamic strength is judged utilizing the sandstone grain size index; S7, the grain size variation is judged utilizing the sandstone grain size variation index; S8, the material source stability is judged utilizing the sandstone thickness index; S9, the ranges of the sedimentary facies form step S2 to step S8 is reduced step by step according to the study layer lithological combination index, so that the sedimentary facies is judged; and the step S2 to step S8 are not sequential.

Description

technical field [0001] The invention relates to the technical field of mineral oil and gas resource exploration, in particular to a method for identifying sedimentary facies by using lithological combinations. Background technique [0002] Sedimentary facies is the overall picture of a certain part of the earth's surface in a certain geological period, and it is a synthesis of the characteristics of the sedimentary environment and the sedimentary rocks (objects) formed in this environment. Oil and gas exploration can infer the horizontal type and series of adjacent areas according to the sedimentary facies sequences that appear vertically, and provide a basis for selecting powerful target areas. Sedimentary facies identification can be comprehensively judged by field outcrop, core, logging and seismic data, but its evaluation method often relies too much on the research experience of researchers, which belongs to qualitative analysis, and the research period is too long, mak...

AI Technical Summary

Problems solved by technology

Sedimentary facies identification can be comprehensively judged by field outcrop, core, logging and seismic data, but its evaluation method often relies too much on the research experience of researchers, which belongs to qualitative analysis, and the research period is too long, making the old oilfield Sedimentary facies identification becomes complicated and the workload is heavy

Images