Simple method for measuring crack occurrence in vertical well core
A measurement method and core technology, applied in the field of fracture research in fractured oil and gas reservoirs, can solve problems such as difficult to satisfy the fine modeling of fractured reservoirs, unfavorable fracture development regularity, etc., and achieve a simple and easy determination method and accurate occurrence credible effect
Active Publication Date: 2019-05-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
In short, in the process of core observation, whether it is the dip angle of a single fracture or the angle between the inclinations or strikes of fractures in different azimuths, it is currently difficult to measure directly and accurately due to the influence of the shape of the core, which is not conducive to fine characterization The development of fractures is regular, and it is difficult to meet the needs of fine modeling of fractured reservoirs
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[0038] combined with Figure 1-6 , the present invention is further described: a method for measuring the dip angle of a single fracture and the angle between different fracture inclinations in a vertical well core, such as figure 1 As shown, the specific embodiment includes the following steps:
[0039] (1) According to the observed length of a certain core column, cut a rectangular transparent paper of a certain size. It is required that the size of the transparent paper along the axial direction of the core column is not less than the length of the core column, and the width of the transparent paper is not less than the length of the core column. perimeter. like figure 2 As shown in the figure, a coordinate origin O is set in the lower left corner of the transparent paper, and the horizontal line OX and the vertical line OY are respectively drawn through this point, in which the OY direction represents the length of the core column, and the OX direction represents the az...
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The invention discloses a method for measuring an included angle between a single crack inclination and different crack tendencies or trends in a vertical well core, comprising the following steps: step S1, cutting a rectangular transparent paper of a certain size according to the observed core column; step S2, enclosing the core column with the transparent paper, and copying the intersections ofeach crack surface on the core column and the core column surface n the transparent paper; step S3, for a certain crack surface, analyzing the characteristics of the crack surface and the intersections of the core column surface, and determining an inclination and a viewing tendency; step S4, for the plurality of cracks on the same core column, further determining an included angle between the crack tendencies or trends respectively according to the inclination and viewing tendency determined in the step 3; and step S5, for a plurality of cracks on the same core block, counting the number of cracks on the transparent paper, and determining the crack line density according to the length of the core column. The method for determining crack occurrence according to the invention is simple andeasy, and the determined occurrence is accurate and credible, which can provide accurate constraint data for fine modeling of fractured reservoirs.
Description
technical field [0001] The invention relates to the field of fracture research in fractured oil and gas reservoirs, in particular to a method for measuring the dip angle of a single fracture and the angle between different fracture tendencies in a vertical well core. Background technique [0002] With the deepening of exploration and development of oil and gas fields, the proportion of fractured oil and gas reservoirs in oil and gas reservoirs continues to increase. Such oil and gas reservoirs are mainly unconventional reservoirs such as tight sandstone, volcanic rock and metamorphic rock. Directly controlled by fracture development. Fractures constitute the main storage space and seepage channel of oil and gas in unconventional reservoirs, and the orientation of fractures controls the seepage direction of underground fluids. At present, the importance of fractures has been paid more and more attention. Fracture research has important theoretical and practical significance ...
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Inventor 陆诗阔王雪涛贾祥明张守乾范新增宋星琨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)