Judgment method of fluid properties in tight sandstone formation
A technology for tight sandstone and formation fluid, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., and can solve the problems of inaccurate evaluation of fluid properties in tight sandstone formations, etc.
Active Publication Date: 2019-11-08
PETROCHINA CO LTD
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[0005] The embodiment of the present invention provides a method for judging fluid properties of tight sandstone formations, so as to overcome the problem of inaccurate evaluation of fluid properties in tight sandstone formations in the prior art when tight sandstone formations are under strong extrusion stress
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[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0040] In the process of oil and natural gas exploration, since the tight sandstone formation is subject to strong extrusion stress, the resistivity collected through logging will be affected by the stress, and the formation hydrocarbon saturation calculated by this resistivity is too large, resulting in poor reservoir fluid evaluation. allow...
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The invention provides a judging method for the property of fluid of a tight sand formation. The judging method includes the steps that the maximum horizontal primary stress and the minimum horizontal primary stress in the tight sand formation are determined, and then the horizontal primary stress difference, namely the difference between the maximum horizontal primary stress and the minimum horizontal primary stress, is determined according to the maximum horizontal primary stress and the minimum horizontal primary stress; a relational expression for the apparent resistivity of the tight sand formation and the horizontal primary stress difference is established, and thus the true resistivity of the tight sand formation is determined according to the horizontal primary stress difference, the apparent resistivity of the tight sand formation and the relational expression, wherein the true resistivity of the tight sand formation is the actual resistivity of the tight sand formation; and finally the property of fluid of the tight sand formation is determined according to the true resistivity of the tight sand formation. The property of fluid of the tight sand formation is determined according to the calculated true resistivity of the tight sand formation, and therefore judging accuracy of the property of fluid of the tight sand formation can be effectively improved.
Description
technical field [0001] The invention relates to oil and gas exploration technology, in particular to a method for judging fluid properties of tight sandstone formations. Background technique [0002] In the process of oil and natural gas exploration, judging the properties of reservoir fluids by using well logging data is the main task of logging data evaluation. [0003] The current method used to identify reservoir fluid properties is to calculate the gas saturation or oil saturation of the reservoir based on the empirical formula obtained from sandstone reservoirs—the Archie formula, and evaluate the fluid properties in the reservoir by calculating the saturation value. Oil and gas or formation water. [0004] However, in the ultra-deep, high-temperature, high-pressure tight sandstone formation, the resistivity of the tight sandstone formation is affected by the high extrusion stress, so that the apparent resistivity value of the formation directly measured by the loggin...
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IPC IPC(8): E21B49/00
Inventor 肖承文陈伟中赵新建祁新忠韩闯郑新华周磊王焕增艾勇曹军涛蔡德洋
Owner PETROCHINA CO LTD