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Method for quantitative representation of leakage risk of oil-gas cap rock due to faulting effect

A quantitative characterization and fault technology, applied in geophysical measurement, instruments, etc., can solve the problems of inaccurate characterization of oil and gas caprocks, leakage risks, etc., and achieve the effects of improving drilling success rate, high accuracy, and reducing drilling risks

Inactive Publication Date: 2017-05-10
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for quantitatively characterizing the risk of leakage of oil and gas caprocks due to faulting. This method for quantitatively characterizing the risk of oil and gas caprock leakage due to faulting is used to solve the current problem of not being able to accurately characterize the risk of oil and gas caprock leakage due to faulting. oil and gas caprock seepage risk

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  • Method for quantitative representation of leakage risk of oil-gas cap rock due to faulting effect
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  • Method for quantitative representation of leakage risk of oil-gas cap rock due to faulting effect

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[0031] Below in conjunction with accompanying drawing, the present invention will be further described:

[0032] This method of quantitatively characterizing the seepage risk of oil and gas cap rocks due to faulting includes the following steps:

[0033] a. Establishment of cap rock and fault structure model: use core, imaging logging and conventional logging data to interpret the lithology (sandstone and mudstone) characteristics of the target layer, and determine the thickness of each layer of mudstone and sandstone and the cap rock The total thickness is used to establish caprock and fault structure models, and the model features are: The cap rock is composed of thick mudstone interbedded with thin sandstone; The mudstone layer has good sealing ability, and each layer of mudstone has a similar thickness, and the thin sandstone has good lateral and vertical connectivity, which can cause oil and gas migration; Faults are randomly distributed in the caprock. If the fault th...

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Abstract

The invention relates to a method for quantitative representation of a leakage risk of oil-gas cap rock due to a faulting effect. The method comprises: establishing a cap rock and fault structure model; drawing a cap rock leakage risk model plate; calculating an effective mudstone layer number; calculating a minimal fault displacement value Tmin needed by an adjacent leakage layer butt joint; predicting the number of faults with the fault displacement value large than the Tmin; and establishing a leakage probability model of a research area and determining a leakage risk. According to the method provided by the invention, because of comprehensive consideration of features of the cap rock and the characteristic of different cap sealing capabilities of different cap rock lithology combined features, the accuracy of the leakage risk determination can be improved and the effectiveness is good. With the method, the probability of the oil-gas cap rock leakage risk resulted from a faulting effect can be calculated in a quantitative mode before drilling, so that the drilling risk can be reduced and the drilling success rate can be improved. Therefore, the method has the great significance in guiding exploitation and development of an oil and gas field.

Description

technical field [0001] The invention relates to the technical field of geological exploration and development of fault oil and gas reservoirs, in particular to a method for quantitatively characterizing the leakage risk of oil and gas cap rocks caused by fault action. Background technique [0002] Deep oil and gas reservoirs in my country are mostly formed in complex superimposed basins under the background of multi-stage structural changes and superimposed transformation of various processes. Compared with the middle and shallow layers, the sealing conditions of deep oil and gas will change significantly. Low, brittle-ductile transformation occurs, causing faults, subseismic faults and cracks to be very developed. Subseismic faults refer to small faults whose fault throw is smaller than the seismic resolution. They are usually neither identified from seismic data nor drilled from drilling data. It is difficult to identify and predict them using traditional methods. Although...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 巩磊高帅付晓飞王海学孟令东吴桐
Owner NORTHEAST GASOLINEEUM UNIV
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