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Detection method of fracture fluid
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A detection method and fluid technology, applied in the field of geological exploration, can solve problems such as difficult fracture fluid identification
Active Publication Date: 2018-07-20
CHINA PETROLEUM & CHEM CORP +1
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[0004] The purpose of the present invention is to provide a fracture fluid detection method to solve the technical problem that it is difficult to directly identify fracture fluid in the prior art
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Embodiment 1
[0049] The embodiment of the present invention provides a fracture fluid detection method, which can be applied to the exploration of fractured oil and gas reservoirs. Such as figure 1 As shown, the detection method of the fracture fluid includes:
[0050] S1: Establish a fracture fluid model.
[0051] From the geological point of view, fractures and fluids are closely related. The embodiment of the present invention proposes a parameter capable of simultaneously representing fractures and fluids: Factor of Fluid-filled Fracture (FFF for short), or called fissure flow factor.
[0052] The fracture fluid factor can not only characterize the development of fractures in underground formations, but also identify formation fluids. That is to say, the fracture fluid factor can represent the differences in the following four conditions of the formation: the formation contains water and no fractures, the formation contains gas and no fractures, the formation contains water and frac...
Embodiment 2
[0100] In this embodiment, the above fracture fluid detection method is used to detect the fracture fluid in the target well. Such as Figure 4 As shown, in the well logging data, the target well has a gas saturation curve, and the curve value of the target well position is extracted from the fracture fluid factor data volume, and compared with the gas saturation curve of the target well.
[0101] Near the 2,747-2,800-meter section of the target well, the gas saturation is high, and the corresponding FFF values are all between 0° and 90°. The gas saturation peak is near 2782 meters, and the corresponding FFF value also tends to 0°. From 2800 meters to 2900 meters, the gas saturation gradually decreases, and the FFF value is around 180°, showing low gas saturation and high water saturation.
[0102] From the comparison, the overall trend of the gas saturation of the target well is consistent with that of the fracture fluid factor, which proves the effectiveness and reliabil...
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Abstract
The invention discloses a fracture fluid detection method, belongs to the geological exploration technology field and solves a technical problem that fracture fluid identification can not be directly carried out in the prior art. The method comprises steps that a fracture fluid model is established; pre-stack gather is processed to acquire a first CRP gather of multiple azimuths and a second CRP gather on the basis of an offset distance; superposition processing and attribute calculation of the first CRP gather are carried out to acquire earthquake dynamics parameters of each azimuth; pre-stack AVO inversion of the second CRP gather is carried out to acquire transverse wave impedance and longitudinal wave impedance under the isotropy condition; according to the earthquake dynamics parameters, the transverse wave impedance and the longitudinal wave impedance, fracture fluid factors are figured out by utilizing the fracture fluid model; according to values of the fracture fluid factors, a detection result of the fracture fluid is acquired.
Description
technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method for detecting fracture fluid. Background technique [0002] Fluid identification using Amplitude Versus with Offset (AVO detection) is a widely used fluid identification method at present. The reflection coefficient of seismic waves in gas-bearing sandstones will increase with the increase of offset. It also lays the foundation for fluid identification using AVO. In order to study the AVO characteristics of formation lithology in more detail, researchers in this field have proposed a division scheme of AVO response characteristics, and combined pre-stack inversion, multi-attribute intersection analysis technology with AVO theory, fluid in multiple areas Success in identification studies. In the combination of these technologies, the concept of fluid factor (Fluid Factor), which can directly identify fluid properties, is proposed. The fluid factor constr...
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