Method and device for determining river type conversion of fluvial facies stratum

Abstract

The invention provides a method and device for determining river type conversion of a fluvial facies stratum. The method comprises the steps: determining a fluvial facies sedimentary layer section ofa target region, and dividing sand groups according to the sedimentary cycle characteristics of the fluvial facies sedimentary layer section; on the basis of the fluvial facies sedimentary stratum profile, carrying out statistics to obtain sensitive sedimentary parameters in each divided sand group and using the sensitive sedimentary parameters for reflecting river type changes; acquiring sensitive sedimentary parameters in each sand group according to statistics, determining indication sensitive parameters with obvious characteristic response in the sensitive sedimentary parameters, and calculating a change rate average value of the indication sensitive parameters of each sand group; and according to the change rate average value of the indication sensitive parameters of each sand group,determining the river type conversion vertical layer section position of the fluvial facies stratum in the target area. The vertical layer section position of river type conversion of the fluvial facies stratum is quantitatively determined based on logging data, plane and profile sand body distribution characteristics of different layers of sections in the fluvial facies stratum can be more accurately implemented, and the effect of exploration and development deployment is improved.

Description

technical field [0001] The invention relates to the technical field of geological research, in particular to a method and device for determining river-type transformation of fluvial strata. Background technique [0002] There are abundant mineral resources in fluvial sediments, and fluvial sand bodies are important reservoir types in many petroleum-bearing basins at home and abroad. The spatio-temporal transformation of the river type directly affects the plane and section distribution of favorable reservoirs. In the field of oil and gas exploration, the braided river sand bodies distributed contiguously in the same study area form structural oil reservoirs, which evolve into banded reservoirs due to the river type transformation. The distributed meandering river sand bodies have the exploration potential of lithologic reservoirs. In the field of oil and gas development, river type conversion may cause different distribution of sand bodies and interlayers in different subla...

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Problems solved by technology

However, it is limited to qualitatively describing the change trend of the river type, and does not provide a method for quantitatively determining the change of the river type, which leads to large differences in the division methods of different researchers for the same set of strata, which affects the exploration and development results.

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