Method and device for evaluating sealing ability of cap layer
A sealing ability and evaluation method technology, applied in the field of capping sealing capability evaluation methods and devices, can solve the problems of evaluation result error, cost increase, data affected by capping heterogeneity, etc., and achieve low cost and evaluation accuracy. High, easy-to-obtain results
Active Publication Date: 2018-12-21
CHINA UNIV OF GEOSCIENCES (BEIJING)
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Problems solved by technology
[0004] In view of this, the embodiment of the present invention provides a cap rock sealing ability evaluation method and device to solve the problem that in the prior art, a large number of experimental cores need to be prepared for the displacement pressure experiment of the core through physical simulation, resulting in an increase in cost. If the core The number is small, the obtained data is seriously affected by the heterogeneity of the caprock, and the evaluation results have large errors
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[0048] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0049] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.
[0050] refer to figure 1 , figure 1 It is a schematic flow chart of the method for evaluating the sealing ability of the cap layer provided by an embodiment of the present invention. The method can be applied to computers or servers that process data such as oil and ...
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The invention provides a method and device for evaluating the sealing ability of a cap layer. The method comprises: stratum logging data of oil and gas wells in a target exploration area are obtained;a corresponding relationship between thicknesses of cap layers of a plurality of oil and gas wells and argillaceous contents of the cap layers is substituted into a two-dimensional coordinate systemestablished by using the thickness values of the cap layers as horizontal coordinates and the argillaceous contents of the cap layers as vertical coordinates; according to the cap layer positions andhydrocarbon reservoir positions of the plurality of oil and gas wells, the oil and gas well coordinate points in the two-dimensional coordinate system are classified into three classes: a class of having the hydrocarbon reservoirs below the cap layers completely, a class of having the hydrocarbon reservoirs above the cap layers completely, and a class of having the hydrocarbon reservoirs above andbelow the cap layers; according to the coordinate points of divided areas in the two-dimensional coordinate system, a cap layer sealing ability evaluation parameter threshold is determined and the sealing ability of a to-be-evaluated cap layer is evaluated. The stratum logging data are available; preparation of lots of cores for the experiment is not needed; the cost is low; and the cap layer sealing ability evaluation accuracy is high.
Description
technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method and a device for evaluating the sealing ability of cap rocks. Background technique [0002] Caprock refers to the protective layer located above the reservoir that can isolate the reservoir and prevent the oil and gas in it from escaping upward. The cap rock is a low-permeability layer closely connected to the reservoir, which can protect the oil and gas in the reservoir from escaping upward. The cap rock is mostly composed of mudstone, shale, gypsum rock and salt rock or marl. Good sealing ability of cap rocks is a necessary condition for the formation of large oil and gas fields, and the evaluation of sealing ability of cap rocks is an important factor in the evaluation of oil and gas exploration. [0003] At present, the main way to evaluate the sealing ability of the cap rock is to conduct displacement pressure experiments on the c...
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IPC IPC(8): G01V9/00
Inventor 郎岳张金川
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)