Well logging predication method relative to paleo-water-depth index parameters

Abstract

The present invention discloses a well logging predication method relative to paleo-water-depth index parameters, belonging to the basin analysis and petroleum geology field. The method mainly comprises the following steps: a, performing design and sampling according to the real geological condition, performing the elementary geochemistry test of samples of palaeo-lacustrine basin deep low area, and obtaining an actually measured paleo-water-depth index parameter Mn/Fe; b, reading corresponding well logging curve values of the measured samples, wherein the well logging curve values include the resistivity logging RT and the acoustic logging AC; c, building the functional relation among the paleo-water-depth index parameter Mn/Fe, the RT and the AC data; and d, obtaining a longitudinally continuous paleo-water-depth index parameter Mn/Fe curve, and performing error analysis. The well logging predication method relative to paleo-water-depth index parameters can fully employ the conventional well logging materials to predicate the depth of the palaeo-lacustrine basin depositional stage relative to the fossil water, although the predication result is equivalent to the elementary geochemistry method, the predication result is more economic and more practical. The well logging predication method relative to paleo-water-depth index parameters is applied in the jianghan basin jiangling depression and the pearl river mouth basin enping depression, and is high in practicability.

Description

technical field [0001] The invention relates to the fields of basin analysis and oil and gas geology, in particular to a logging prediction method for relative paleowater depth index parameters. Background technique [0002] Paleo-depth restoration is an important part of paleoenvironmental research and basin analysis, as well as the key content of determining ancient sea level changes and paleogeomorphological restoration. [0003] For a long time, the determination of ancient water depths has been mostly based on biological markers with water depth significance, such as calcareous algae, benthic and planktonic foraminifera, coral communities, ostracods, and coccoliths. These data provide information for the restoration of ancient water depths. A lot of research results have been obtained. However, when restoring paleowater depths to sedimentary strata in oil-gas-bearing basins in non-field outcropping areas, the above-mentioned methods generally rely heavily on cores (phy...

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Problems solved by technology

However, because the content of Th is different between clastic rocks and chemical sedimentary rocks, in order to eliminate the influence of lithology, it is necessary to select rock formations with consistent lithology for research, and for the work areas that do not belong to the same sedimentary water range in the plane and vertical, it is necessary to separate Analyze and adjust the parameters of the calculation formula, resulting in cumbersome calculation process

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