Method for calculating ancient gradient of sedimentary body

Abstract

The invention relates to a method for calculating the ancient gradient of a sedimentary body. The method includes the steps of: selecting a seismic section along an object source direction on a stratum contour plane graph, and obtaining a gradient direction of the ancient gradient of the sedimentary body; leveling a top level of the ancient gradient of the sedimentary body, thereby obtaining a top layer leveling line; according to a seismic interpretation horizon of the sedimentary body in the seismic section, obtaining a trend line of the seismic interpretation horizon; extending the trend line of the seismic interpretation horizon on the seismic section to intersect with the top layer leveling line of the gradient of the sedimentary body at a certain point, and obtaining a horizontal distance between an actual drilling point and the intersection point; at the actual drilling point between the top layer leveling line of the gradient of the sedimentary body and the seismic interpretation horizon, determining difference of elevation of the sedimentary body at the well point; and according to the horizontal distance and the difference of elevation of well point, obtaining the required ancient gradient of the sedimentary body, thereby providing a basis for space-time distribution of a sedimentary system of a well spacing density sparse oilfield in an exploring and developing assessment stage. The method provided by the invention can obtain the size and direction of the ancient gradient of the sedimentary body.

Description

technical field [0001] The invention relates to a method for obtaining paleogeomorphology in the evaluation stage of exploration and development, in particular to a calculation method for paleo-slope of sedimentary bodies. Background technique [0002] The calculation of paleo-slope is the core issue of paleogeomorphology, and it is also a research hotspot. Paleo-slope is the inclination of paleo-topography relative to the horizontal plane, which is a vector unit, including magnitude and direction. The slope of the paleogeomorphic sedimentary body is equal to the angle between the tangent plane of the surface surface at this point and the horizontal plane, and the slope direction is the projection direction of the line connecting the point and the deposition center on the horizontal plane. The sedimentary paleo-slope is mainly affected by the combined effects of structural deformation, sedimentary filling, differential compaction, weathering and denudation, and ancient wate...

AI Technical Summary

Problems solved by technology

In addition, the correction of water depth is mainly calculated based on sedimentary structures, paleontology, authigenic minerals, and ancient bathymetric curves, and quantitative indication of water depth is difficult

Therefore, although the slope calculation result has been improved, it lacks the calculation of the direction vector, the operability is poor, and the operation is cumbersome

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