Tight reservoir classification model building method and tight reservoir classification method
A technology for tight reservoirs and classification models, which is applied in the fields of earth-moving drilling, wellbore/well components, etc., can solve the problems of numerous classification methods of tight reservoirs, poor practicability of classification methods, and complicated classification methods, and achieves practicality. Strong, reduce error rate, simple operation effect
Active Publication Date: 2017-01-11
PETROCHINA CO LTD
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[0004] The porosity of tight reservoirs is generally less than 10%. According to the reservoir classification standards for sandstone oil and gas reservoirs in the prior art, they belong to ultra-low porosity and ultra-low permeability reservoirs and non-reservoirs. To evaluate tight reservoirs, the It is necessary to classify tight reservoirs in detail. There are many and inconsistent classification methods for tight reservoirs, some of which are complex and costly, and most of them are not practical. Therefore, there is an urgent need for a unified, simple and practical A Strong Tight Reservoir Classification Method
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[0045] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0046] The principle of the present invention is: use water-based drilling fluid in oil layer drilling coring, surface analysis process, reservoir pore fluid (mainly oil and water) preservation condition, determine the flow situation of oil and water, because reservoir rock core is mostly In hydrophilic and non-oil-wet formations, the direction of capillary force for oil generally flows out from the reservoir core to the outside of the core; for water, it generally infiltrates from the outside of the core to the reservoir core; As the capillary force increases, the capillary force changes back and forth between resistance and driving force, from preventing oil from flowing out of the reservoir core to driving oil to the outside of the core, while displa...
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The invention relates to a tight reservoir classification model building method and a tight reservoir classification method. The tight reservoir classification model building method comprises the steps that the porosity, oil saturation and water saturation of multiple first sampling cores are obtained; the oil and water saturation of each first sampling core is obtained according to the oil saturation and water saturation of the first sampling core; by taking the porosity as the horizontal axis and taking the oil saturation, water saturation and oil and water saturation as the longitudinal axis, crossplot of the porosity and saturation is built, and trend lines, about the porosity, of the oil saturation, water saturation and oil and water saturation are drawn; the porosity ranges of all classifications of a tight reservoir are determined according to extreme points or inflection points on all the trend lines, and the tight reservoir classification model is obtained. According to the tight reservoir classification model building method and the tight reservoir classification method, operation is easy, the classification result practicability is high, an accurate basis can be provided for tight oil reservoir evaluation, and the error rate of exploration and development in the later stage is decreased.
Description
technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for establishing a tight reservoir classification model and a tight reservoir classification method. Background technique [0002] In conventional oil and gas reservoir evaluation, it is often necessary to determine the reservoir classification method, and the commonly used reservoir classification method is distinguished by porosity and permeability. [0003] In the prior art, the reservoir classification standard for sandstone oil and gas reservoirs is usually determined by a multiple of 5 to determine the distinguishing point. According to the porosity and permeability from large to small, it is divided into ultra-high porosity and ultra-high permeability reservoirs, high porosity and high permeability reservoirs, and high porosity and high permeability reservoirs. reservoirs with medium porosity and medium permeability, reservoirs with low poros...
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Login to View More IPC IPC(8): E21B49/00E21B49/02
CPCE21B49/00E21B49/02
Inventor 金涛乐园杨家静杨天泉白蓉李秀清罗迪刘敏陈龙韦腾强
Owner PETROCHINA CO LTD