Method and device for determining reservoir pore pressure
A pore pressure and reservoir technology, applied in the field of geophysical exploration, can solve the problems of inaccurate reservoir pore pressure and poor precision
Active Publication Date: 2019-09-10
PETROCHINA CO LTD
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[0005] The embodiment of the present application provides a method and device for determining the reservoir pore pressure to solve the technical problems of inaccurate and poor precision of the determined reservoir pore pressure existing in the existing method, so as to avoid obtaining the compaction trend line, Make full use of the relationship between elastic modulus and porosity, saturation and pressure of unconsolidated sandstone to accurately determine the technical effect of unconsolidated sandstone reservoir pore pressure
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[0077] In order to enable those skilled in the art to better understand the technical solutions in the application, the following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Obviously, the described The embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.
[0078] Taking into account the existing methods, most of which are based on experience, the normal compaction trend line is established according to the logging data, and then the above-mentioned normal compaction trend line is used to determine the pore pressure of the reservoir. Because the accuracy of the reservoir pore pressure determined by the above ...
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The embodiment of the invention provides a reservoir pore pressure determination method and device. The method comprises the steps that the logging data and multiple preset pressure of the target areaare acquired; the coordination number of the volume modulus and the coordination number of the shear modulus corresponding to the preset pressure are determined according to the logging data and therelation between the loose sandstone grain contact coordination number and the effective pressure; the effective pressure is determined from multiple preset pressure according to the two types of coordination number and the logging data; and the reservoir pore pressure is determined according to the effective pressure. According to the scheme, the relation between the unconsolidated sandstone elasticity modulus and the porosity, the saturation and the pressure is considered, and the more accurate coordination number of the volume modulus and the coordination number of the shear modulus corresponding to the preset pressure are determined according to the relation between the loose sandstone grain contact coordination number and the effective pressure so that the reservoir pore pressure canbe more accurately calculated later, and the technical problems of inaccuracy and poor precision of reservoir pore pressure determination existing in the present method can be solved.
Description
Technical field [0001] This application relates to the field of geophysical prospecting technology, in particular to a method and device for determining the pore pressure of a reservoir. Background technique [0002] In geophysical exploration, it is often necessary to predict the effective pressure of the reservoir first, and then determine the pore pressure of the reservoir, so that the abnormal position of the oil and gas reservoir pressure in the area can be predicted based on the pore pressure of the reservoir in order to guide the subsequent well location deployment. [0003] At present, in order to determine the pore pressure of the reservoir, most of them first establish a normal compaction trend line based on logging data and related experience; then, according to the above normal compaction trend line, calculate the deviation of the actual logging data from the normal compaction trend line in the mudstone formation The specific size of the formation pore pressure at the t...
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IPC IPC(8): G01V1/30
Inventor 李红兵蔡生娟潘豪杰董世泰李勇根
Owner PETROCHINA CO LTD