Method and device for evaluating heterogeneity of shale gas reservoirs
A heterogeneous, shale gas reservoir technology, applied in earthwork drilling, measurement, instruments, etc., can solve the problems of poor field promotion and achieve the effect of easy data acquisition
Active Publication Date: 2018-12-07
PETROCHINA CO LTD
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However, shale gas reservoirs have the characteristics of artificial reservoirs, and the development of gas reservoirs is not only affected by geological conditions, but also controlled by stimulation measures such as horizontal wells and fracturing, and the heterogeneity evaluation method that only considers geological factors is not strong in field promotion
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[0044] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The implementations are only some of the implementations of the present application, not all of them. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.
[0045] refer to figure 1 As shown, in an embodiment provided in this specification, the method for evaluating the heterogeneity of shale gas reservoirs includes the following steps:
[0046] S1. Obtain historical production data of at least some shale gas wells in the research block;
[0047] S2. Based o...
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The invention provides a method and device for evaluating the heterogeneity of shale gas reservoirs. The method for evaluating the heterogeneity of the shale gas reservoirs comprises the steps that historical production data of at least part of shale gas wells in a research block are obtained; based on the historical production data, the EUR of the shale gas wells is calculated through a production prediction model, and the EUR of the shale gas wells constitutes a first data set; according to the probability distribution of the EUR in the first data set, an EUR cumulative probability distribution curve is drawn in the order of the EUR from small to large; the EUR corresponding to the cumulative probability of m and n in the curve is obtained separately, and the values of the correspondingEUR are denoted as Pm and Pn separately; and based on the ratio of Pm to Pn, the relative standard for heterogeneity evaluation is established, and the heterogeneity of the shale gas reservoirs is evaluated. According to the method for evaluating the heterogeneity of the shale gas reservoirs, the comprehensive heterogeneous coefficient (the ratio of Pm to Pn) which can reflect stimulation treatment is used as the evaluation index for the heterogeneity of the shale gas reservoirs, and therefore, the evaluation result is more in line with the actual situation.
Description
technical field [0001] This specification relates to a shale gas reservoir heterogeneity evaluation method and its device. Background technique [0002] Reservoir heterogeneity refers to the difference in three-dimensional space distribution and change of reservoir lithology, physical properties or oil and gas properties, which can be divided into macroscopic heterogeneity and microscopic heterogeneity, while macroscopic heterogeneity It also includes interlayer, plane, and intralayer heterogeneity. The heterogeneity evaluation of conventional oil and gas reservoirs is mainly based on the evaluation of reservoir heterogeneity. Generally, parameters such as permeability coefficient of variation, breakthrough coefficient and permeability difference are used to describe reservoir heterogeneity characteristics. The larger the value of the above parameters , the stronger the reservoir heterogeneity. Conventional reservoir heterogeneity evaluation methods are not suitable for sh...
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Login to View More IPC IPC(8): E21B47/00G06Q50/02
CPCG06Q50/02E21B47/00
Inventor 孙玉平万玉金陆家亮张静平苏云河唐红君李俏静刘海李海波张合文
Owner PETROCHINA CO LTD