Multi-mineral component calculation method based on single acoustic wave old logging series

Abstract

The invention discloses a multi-mineral component calculation method based on a single acoustic wave old well logging series, belongs to the field of geophysical exploration, and solves the problem that an old well of an electrical combination series in the prior art only has four curves of AC, GR and RT/RXO and cannot meet the solving of complex mineral components. The calculation method is suitable for well logging in which carbonaceous substances and grey substances do not coexist in the same lithology, and comprises the following steps: S1, core homing; s2, calculating the shale content Vsh; s3, establishing an effective porosity model; s4, calculating the effective porosity phi; s5, marking a carbonaceous layer FLAG_COAL; s6, marking a grey matter layer FLAG_CA; and S7, calculating the content of grey matter, carbonaceous matter and sandstone according to the rock volume physical model. According to the sedimentary principle that carbonaceous and grey matter do not coexist in the same lithology, the components of the multi-mineral tight sandstone are calculated by using a distributed solution method, the problem of multi-mineral solution of a single acoustic logging series is solved, and a good application effect is obtained in the Hua River group in Jinhua-autumn block.

Description

technical field [0001] The invention relates to the field of geophysical exploration, belongs to logging data processing and evaluation technology, in particular to a multi-mineral component calculation method based on single acoustic wave old logging series. Background technique [0002] In the Upper Triassic Xujiahe Formation of the Sichuan Basin, a set of continental coal-measure tight clastic strata developed, which is a key formation for exploration and development in the Sichuan Basin. The Xujiahe Formation can be divided into six layers from bottom to top, of which the Xu 2 and Xu 4 members are the main target layers, and the rest of the layers also have oil and gas shows, which belong to low-porosity, ultra-low permeability tight reservoirs. Its reservoirs are typically characterized by complex lithology, including black shale, coal, mudstone, calcareous limestone and quartz sandstone. Microscopic data such as thin sections and electron microscopes show that the min...

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Problems solved by technology

[0004] For old wells with only gamma, sonic and resistivity curves, the above methods cannot directly meet the conditions for solving multi-mineral components

There are generally two methods for old wells: one is to treat the complex lithology as a simple sand-shale formation, but the accuracy of the logging interpretation results is low, which does not meet the requirements of fine logging interpretation; the other is based on If there are existing curves, reconstruct one or more pseudo-curves and then perform multi-mineral solution. This method has strong uncertainty

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