Fracture development degree identifying method of dense dolomite reservoir
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A technology of fracture development and identification method, which can be used in geophysical measurements, instruments, etc., and can solve problems such as low accuracy, high service cost, and qualitative error.
Inactive Publication Date: 2016-11-09
CHINA UNIV OF GEOSCIENCES (WUHAN)
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However, for tight reservoirs, the difference in such changes is small, and the single use of this logging data is not effective in identifying fractures.
[0007] (4) Although imaging logging can intuitively and visually show the two-dimensional geological characteristics of the borehole wall, there are problems such as high service cost, insufficient model information, and multi-solution of geological feature recognition in the application of imaging logging.
[0008] In the process of identifying the li
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Embodiment 1
[0023] Embodiment 1. A method for identifying fracture development in tight dolomite reservoirs.
[0024] see figure 1 , the fracture development identification method provided in this embodiment includes:
[0025] S1. Finely divide the lithology of tight dolomite reservoirs, describe the fracture characteristics of different lithology sections, and establish a corresponding relationship chart between different lithology sections and fracture characteristics, wherein the fracture characteristics include at least fracture lines density value.
[0026] Specifically, the tight dolomite reservoirs in the study area are finely divided, usually can be divided into dolomite, dolomitic mudstone and mudstone, each lithological section corresponds to a different formation thickness, core Measurement can describe the fracture characteristics of each lithological section, where the fracture characteristics of each lithological section can usually be described as fracture dip angle, angl...
Embodiment 2
[0043] In order to further deepen the understanding of the method for identifying the degree of fracture development provided in Embodiment 1, this embodiment is described with a specific example.
[0044] The lithology of tight dolomite reservoirs in the Tanggu area of Dagang Oilfield is finely divided into dolomite, argillaceous dolomite, argillaceous dolomite, dolomitic mudstone, dolomitic mudstone, and mudstone. According to statistics, the corresponding relationship between rocks of different lithologies and fracture linear densities in different thicknesses and layers is established.
[0045] Data processing process: because the thin interlayer logging data is easily affected by the upper and lower surrounding rocks and is inaccurate, the data points with layer thickness <30cm are eliminated.
[0046] The fracture linear density value of a single lithologic layer (ratio of the number of fractures to the layer thickness) and the average value of each conventional loggin...
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Abstract
The invention discloses a fracture development degree identifying method of a dense dolomite reservoir. The fracture development degree identifying method comprises the steps that the lithological refined division of the dense dolomite reservoir is carried out, and fracture characteristics of different lithological segments are described, and a chart of a corresponding relation between the different lithological segments and the fracture characteristics is established; the fracture line density characteristic values of the different lithological segments are intersected with various well logging parameters by using a scattering method; various sensitive well logging parameters are selected from the various well logging parameters, and a quantitative evaluation model between the various sensitive well logging parameters and the fracture line density characteristic values of the different lithological segments is established; according to the established quantitative evaluation model, the fracture line density value of every well logging point is calculated, and a fracture line density curve is drawn, and the fracture development degree of the dense dolomite reservoir is identified. By adopting the method provided by the invention, a fracture development degree of a dense dolomite type oil reservoir is effectively evaluated, and then a scientific basis is provided for the reasonable development of the dense dolomite oil reservoir.
Description
technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method for identifying the fracture development degree of tight dolomite. Background technique [0002] Tight dolomite reservoirs are characterized by low porosity and tightness. Due to the high brittleness of dolomite, the degree of fracture development is high, that is, the degree of fracture development increases with the increase of dolomite content. The presence of fractures significantly improves the seepage capacity of the reservoir, making the scale of oil and gas production in this type of reservoir reach industrial value, and the identification of fracture line density in tight dolomite reservoirs is a key issue in the exploration and development of this type of oil and gas reservoir. [0003] Currently, fracture identification is mainly based on two types of data, core and well logging. Due to the high cost of core data acquisition, fragile and incompl...
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