Resistivity data and earthquake data combined speed field construction method

Abstract

The invention relates to a resistivity data and earthquake data combined speed field construction method for petroleum and natural gas exploration. Data matching of space positions of the resistivity data and the earthquake data is carried out to acquire a resistivity body in matching with a time domain and a matched resistivity inversion impedance body; an initial speed body is acquired through combined inversion of the resistivity data and the earthquake data; a speed error body is acquired through analysis and correction on an speed error; combined speed field construction is accomplished through correction on an offset data body. According to the resistivity data and earthquake data combined speed field construction method, the speed field reflects spatial distribution characteristic and speed change rules of an exploration strata, the speed value is relatively close to a real strata speed, a depth prediction error is relatively small, and a trap high point and construction can be reliably predicted.

Description

technical field [0001] The invention relates to oil and natural gas exploration technology, in particular to a method for building a field by combining resistivity data and seismic data with velocity. Background technique [0002] During seismic exploration, due to the influence of two sets of shallow high-speed conglomerate layers, lithology, lithofacies and thickness changes, the vertical and horizontal velocity changes are very complicated, resulting in a large error in the velocity of the sub-salt structure in the seismic data. The high point is difficult, so it is the key point to determine the structure of the exploration area to find out the spatial distribution characteristics and velocity variation law of high-speed conglomerate. Practice has shown that it is difficult to effectively predict the distribution characteristics of shallow high-velocity conglomerate simply by using seismic data and existing drilling data. [0003] The data reflecting stratigraphic infor...

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Problems solved by technology

Practice has shown that it is difficult to effectively predict the distribution characteristics of shallow high-velocity conglomerate simply by using seismic data and existing drilling data.

[0003] The data reflecting stratigraphic information obtained by using gravity, magnetic force, electric method, etc. as detection methods are non-seismic data, among which resistivity data can reflect the occurrence characteristics of high-speed conglomerate, but limited by the low precision of non-seismic data itself, purely using non-seismic data Seismic resistivity data are also difficult to accurately describe the spatial distribution characteristics and velocity variation of conglomerate in the complex geological structure of the piedmont

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