Method for predicting high-quality reservoir in gravity flow channel sand

Abstract

The invention discloses a method for predicting high-quality reservoir in gravity flow channel sand and relates to the field of petroleum geological engineering. The method comprises steps as follows: well logging data of gravity flow channel sand in multiple single wells are obtained, and the porosity, the rock density and the longitudinal wave velocity of corresponding gravity flow channel sand in each single well are obtained; corresponding wave impedance of gravity flow channel sand in each single well is further obtained; a porosity-wave impedance interactive chart is established on the basis, and the high-quality reservoir in the gravity flow channel sand is determined according to the chart; wave impedance inversion is performed on target gravity flow channel sand reservoir, and quantitative distribution of the target gravity flow channel sand reservoir is obtained in combination with information of the high-quality reservoir, determined according to the porosity-wave impedance interactive chart, of the gravity flow channel sand. By means of the predicting method, distribution of high-quality reservoir of the gravity flow channel sand can be quantitatively predicted, the blindness of well drilling is eliminated, and the success rate of well drilling is increased.

Description

technical field [0001] The invention belongs to the field of petroleum geological engineering, in particular to a method for predicting high-quality reservoirs in gravity flow channel sand bodies. Background technique [0002] In the continental basins in eastern China, gravity flow channel sand bodies are widely distributed. Since gravity flow is a high-density fluid flow in which the sediment-fluid mixture moves down the slope as a whole under the action of gravity and is mainly transported in a suspended manner, its formation belongs to event deposition. Such as paroxysmal factors directly or indirectly induce the sliding of sediments to form gravity flow deposition. In the gravity flow channel sand body, the clastic particles are mixed in size, poorly sorted, and the physical properties of the reservoirs vary greatly. It is difficult to predict high-quality reservoirs by using seismic data. [0003] At present, petroleum geologists at home and abroad generally use seis...

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Problems solved by technology

[0005] Existing technologies can only distinguish reservoirs, but cannot quantitatively distinguish high-quality reservoirs from poor reservoirs. At the same time, there is currently no effective method for predicting high-quality reservoirs in gravity flow channel sand bodies, and drilling operations are relatively blind , low drilling success rate

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