Method for detecting ratio of karst cave in carbonate reservoir
A carbonate reservoir and detection method technology, applied in the field of oil and gas exploration, can solve the problems of not being suitable for wide application, expensive price, high production cost, etc.
Active Publication Date: 2021-04-09
PETROCHINA CO LTD +1
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[0004] However, the above methods all need to use matching instruments, such as nuclear magnetic logging tools and electrical imaging logging tools, etc., and the production costs of nuclear magnetic logging tools and electrical imaging logging tools are high and the price is expensive, so the above methods are not suitable. suitable for a wide range of applications
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[0050] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0051] The embodiment of the present invention provides a method for detecting the proportion of karst caves in carbonate rock reservoirs, wherein the proportion of karst caves refers to the ratio of the space volume of karst caves to the space of carbonate rock reservoirs, such as figure 1As shown, in the carbonate reservoir with size n*n, that is, 8*8, the blank area is the cave, and the shaded area is the matrix. In this carbonate reservoir, if there are no caves, as shown in the first picture on the left, the proportion of caves in this carbonate reservoir is 0; if a small part of the space is caves, as shown in the middle picture As shown, the proportion of caves in this carbonate reservoir is 20.3%; if most of the space is caves,...
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Abstract
The invention discloses a method for detecting the ratio of a karst cave in a carbonate reservoir, and belongs to the technical field of oil and gas exploration and development. The detection method comprises the steps that the water saturation of a target stratum is detected; a core is drilled in the target stratum, and the core is made into a plunger rock sample; the water saturation of the plunger rock sample is adjusted to be the same as the water saturation of the target stratum; the resistivity of the plunger rock sample is detected; the resistivity of the target stratum is obtained based on a well logging curve graph of a drilled well; the resistivity of fluid in the target stratum is detected, and the fluid is liquid in the karst cave of the target stratum after drilling is started; and the ratio of the karst cave in the target stratum is determined according to the resistivity of the target stratum, the resistivity of the fluid in the target stratum and the resistivity of the plunger rock sample. According to the method, the detection cost of the ratio of the karst cave in the carbonate reservoir is reduced.
Description
technical field [0001] The invention belongs to the field of oil and gas exploration, in particular to a method for detecting the ratio of karst caves in carbonate rock reservoirs. Background technique [0002] Carbonate reservoirs are distinguished from porous sandstone reservoirs by their unique pore space structure, which is characterized by strong heterogeneity. Especially some carbonate reservoirs with caves have strong heterogeneity. The locations where caves exist in carbonate reservoirs often mean that the physical properties of the rock reservoirs, such as resistivity and porosity, are significantly different from those of other locations. On the one hand, the existence of karst caves may lead to potential safety hazards of collapse during construction; on the other hand, the existence of karst caves also means that oil and gas may be stored in them, which is very beneficial to oil and gas exploration. Therefore, it is necessary to develop a method to detect the p...
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IPC IPC(8): E21B49/00G01N27/04G01N27/06
CPCE21B49/00G01N27/041G01N27/06Y02A90/30
Inventor 何家欢杨雨文龙谢冰段勇肖富森张锦涛
Owner PETROCHINA CO LTD