A method for detecting fracture dips in subterranean fractured reservoirs
A reservoir and fracture technology, applied in the field of oil and natural gas seismic exploration, can solve the problem of lack of fracture dip detection methods in fractured reservoirs, and achieve the effect of simple and easy method, strong practicability and good effect.
Inactive Publication Date: 2015-09-30
SOUTHWEST PETROLEUM UNIV +1
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In the above studies, there is still a lack of methods for detecting the dip angle of fractures in fractured reservoirs
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[0048] A method for detecting the dip angle of a fracture in an underground fractured reservoir, comprising the following steps in sequence:
[0049] (1) Determine the time window where the fractured reservoir is located in the time domain of the reflected P-wave data volume. The reception and processing of the fractured reservoir reflected longitudinal wave data volume, and the top and bottom positions of the fractured reservoir are obtained by using common and conventional procedures well known to practitioners. The offset range is a closed interval between 0 meters and 10,000 meters. The angle range is the range of the incident angle of the longitudinal wave corresponding to the range of the offset. There are 3 ways to set the time window.
[0050] 1. Based on the top layer of the fractured reservoir, the upward extension is 30-100ms, and the downward extension is 30-100ms.
[0051] 2. Based on the bottom layer of the fractured reservoir, the upward extension is 30-100ms...
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The invention discloses a method for detecting an inclination angle of a fissure in an underground fissure type reservoir stratum. The method for detecting the inclination angle of the fissure in the underground fissure type reservoir stratum comprises the following steps in sequence: (1) a time window where the fissure type reservoir stratum is located is determined on a time domain of a reflected P-wave data body; (2) the maximum Lyapunov exponent of each signal in the time window is measured; (3) inclination angle marking is carried out on each maximum Lyapunov exponent to obtain the inclination angle of the fissure in the fissure type reservoir stratum. Due to the fact that the surfaces of fissures, except vertical fissures or horizontal fissures, have certain inclination angles generally, when the fissures incline, the periodicity of a longitudinal wave will be interfered and the longitudinal wave has a certain chaos property. The method for detecting the inclination angle of the fissure in the underground fissure type reservoir stratum is based on the nonlinearity property, namely the chaos property, of a reflection system of the fissure type reservoir stratum, the maximum Lyapunov exponents which can represent the nonlinearity property are measured directly, the inclination angle of the fissure is marked in a ration mode, the effect is good, the method is simple and easy to realize, the practicability is strong due to the fact that the stacked data of the longitudinal wave of the fissure type reservoir stratum are adopted, and cost is low.
Description
technical field [0001] The invention relates to a ground seismic exploration technology in the field of oil and natural gas seismic exploration, which is applied to the detection of the inclination angle of cracks in underground formations. Background technique [0002] Oil and natural gas accumulated in underground formations are important exploration and development targets to meet my country's energy needs. Seismic exploration is an important means to detect underground oil and gas reservoirs. Underground formations rely on the pores, cracks, and holes in the formation rock mass that have not been occupied by other fillings to store oil and natural gas. Among them, the underground strata dominated by oil and natural gas in fractured spaces are called fractured reservoirs. Detect and accurately describe various attribute characteristics of fractures in fractured reservoirs, such as fracture density, fracture surface dip, tendency, trend, opening, scale, systematic (or ne...
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Inventor 尹成廖细明朱仕军丁峰赵虎潘树林
Owner SOUTHWEST PETROLEUM UNIV