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Fluid Pressure Prediction Method of Composite Genesis in Deep Basin

A technology of fluid pressure and prediction method, applied in the directions of measurement, earthmoving, wellbore/well components, etc., to achieve the effect of strong practicability, many factors to consider, and solving the difficult problem of fluid pressure prediction

Active Publication Date: 2020-09-25
NORTHWEST UNIV
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Problems solved by technology

[0005] The present invention provides a method for predicting fluid pressure of complex genesis in deep basins, and solves the problem of fluid pressure prediction under complex geological backgrounds

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  • Fluid Pressure Prediction Method of Composite Genesis in Deep Basin

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Embodiment Construction

[0018] The present invention will be clearly and completely described below in conjunction with the accompanying drawings, so that those skilled in the art can fully implement the present invention without creative work.

[0019] The specific embodiment of the present invention is: as figure 1 As shown, the fluid pressure prediction method of basin deep composite origin, including

[0020] (1) Investigate clearly the structure and sedimentary background of the study area, and select areas with stable structures and the same source of sediment in the study area. The areas with stable structure and same source of sediment are areas without obvious horizontal compression and faulting ;

[0021] (2) Research on the law of mudstone compaction in structurally stable and sedimentary provenance areas:

[0022] First, use the geophysical logging data to read the logging sequence values ​​of the pure mudstone section, the logging sequence values ​​include acoustic wave, density, resis...

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Abstract

The present invention provides a method for predicting fluid pressure of basin deep compound genesis, investigates the structure and sedimentary background of the research area, selects areas with stable structure and same source of sediment in the research area; performs mudstone compaction on areas with stable structure and same source of sediment Law research, obtain the mathematical model of the slope of the mudstone compaction curve at the maximum burial depth period; obtain the compaction and loading curve at the maximum burial depth period in structurally complex areas, and obtain the loading curve by plotting the sound velocity and vertical effective stress; obtain the tectonic effect The mathematical model of the vertical effective stress difference before and after, when the vertical effective stress of the formation at the maximum buried depth is squeezed, uplifted or fractured, the vertical effective stress will be reduced to the present size. Influencing factors, build a geological model, on this basis, study its relationship with the distance from the fault or anticline forelimb and denudation thickness, obtain the mathematical model of the vertical effective stress difference before and after the tectonic action; calculate the fluid pressure of composite origin.

Description

technical field [0001] The invention belongs to the technical field of fluid pressure prediction in oil and gas exploration, and in particular relates to a fluid pressure prediction method of composite genesis in deep basins. [0002] technical background [0003] Accurate fluid pressure pre-drilling prediction is crucial in oil and gas exploration, and has always been highly valued by oil and gas geologists and oil and gas engineers. [0004] There are many existing basin fluid pressure prediction methods, such as equivalent depth method, pressure = average rock density at depth*g*depth-(average rock density at equivalent depth-average fluid density at equivalent depth)* g*depth, normal compaction trend method, pressure=hydrostatic pressure+﹛[(rock average density-formation level average density)*g*depth difference] / [log(h2 logging value / h1 logging value)+0.435* Temperature coefficient at any point on the log curve * low temperature gradient between two heights * height dif...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B47/00
Inventor 范昌育王刚陈杰韩晓洁
Owner NORTHWEST UNIV