Horizontal fracture prediction method, device and equipment

Abstract

The present disclosure provides a horizontal fracture prediction method, device and equipment. The method comprises: acquiring primary wave velocities and shear wave velocities of first and second incidence angle directions of seismic waves at a target fracture location, wherein a first incidence angle is smaller than a second incidence angle, and the incidence angles are included angles between propagation directions of the seismic waves and a surface normal direction of a target fracture; calculating a first primary wave / shear wave velocity ratio and a first shear wave splitting (SWS) coefficient of the first incidence angle direction; calculating a second primary wave / shear wave velocity ratio of the second incidence angle direction; and determining that the target fracture is a horizontal fracture under the condition that the first SWS coefficient is smaller than a first preset value and a ratio of the first primary wave / shear wave velocity ratio to the second primary wave / shear wave velocity ratio is smaller than a second preset value. According to embodiments of the present disclosure, whether the target fracture is the horizontal fracture or not is determined through calculating the primary wave / shear wave velocity ratio and the first SWS coefficient of the first incidence angle direction and the primary wave / shear wave velocity ratio of the second incidence angle direction, so that effective data are provided for exploration and development of coal-bed gas and shale gas.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of Chinese Patent Application No. 201811502830.9, filed Dec. 10, 2018, which is incorporated by reference as if fully set forth herein.FIELD OF THE INVENTION[0002]The present disclosure relates to the technical field of geophysical exploration and development and particularly relates to a horizontal fracture prediction method, device and equipment.BACKGROUND OF THE INVENTION[0003]Fractures are extensively distributed in underground rocks, have all-important influence on propagation of seismic waves and also play a critical role in storing and migrating subsurface fluids. Therefore, feature description of formation fractures is an important research content of fractured oil and gas reservoirs. Under the action of tectonic movement, rocks will generate high-angle fractures, also called vertical fractures, which are major research objects in conventional oil-gas exploration. Besides, in shale and coal beds...

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