Basin deep-layer composite genetic fluid pressure prediction method
A technology of fluid pressure and prediction method, applied in the directions of surveying, earthwork drilling, wellbore/well components, etc., to achieve the effect of accurate prediction, many factors to consider, and strong practicability
Active Publication Date: 2019-06-25
NORTHWEST UNIV
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[0004] 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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[0017] 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.
[0018] The specific embodiment of the present invention is: as figure 1 As shown, the fluid pressure prediction method of basin deep composite origin, including
[0019] (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 ;
[0020] (2) Research on the law of mudstone compaction in structurally stable and sedimentary provenance areas:
[0021] 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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The invention provides a basin deep-layer composite genetic fluid pressure prediction method. The method comprises the following steps: investigating structure and deposition backgrounds of a researcharea, and selecting an area with a stable structure and same provenance of deposition in the research area; researching a mudstone compaction law of the area with the stable structure and same provenance of the deposition to obtain a mathematical model of the rate of a mudstone compaction curve at a maximum depth-buried stage; gaining a compaction and loading curve at the maximum depth-buried stage in an area with a complex structure, and plotting to obtain a loading curve through a sound velocity and a vertical effective stress; gaining a mathematical model of difference value of vertical effective stresses before and after tectonism, wherein a vertical effective stress in a stratum at the maximum depth-buried stage reduces to a current size under the action of extrusion, uplift and fracture; constructing a geological model for the influence factors of the difference value of the vertical effective stresses, and researching the relationship between the vertical effective stresses andthe distance with a fault or anticline fore limb and erosion thickness to obtain the mathematical model of the difference value of the vertical effective stresses before and after the tectonism; andgaining composite genetic fluid pressure.
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. technical background [0002] 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. [0003] 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 difference]...
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IPC IPC(8): E21B49/00E21B47/00
Inventor 范昌育王刚陈杰韩晓洁
Owner NORTHWEST UNIV