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Prediction method for overpressured top interface

A top interface and logging curve technology, applied in the field of geological exploration, can solve problems such as difficult to effectively identify and predict overpressure top interface

Active Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for predicting the overpressure top interface to solve the technical problem that it is difficult to effectively identify and predict the overpressure top interface of sedimentary basins in the prior art

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[0026] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0027] The embodiment of the present invention provides a method for predicting the overpressure top interface, which is applicable to the prediction of the overpressure top interface in sedimentary basins, especially in sedimentary basins with relatively large burial depth and relatively high degree of compaction in early strata. Moreover, it is also applicable to the identification and prediction of the ove...

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Abstract

The invention discloses a prediction method for an overpressured top interface, belongs to the technical field of geological prospecting, and solves the technical problem that the overpressured top interface of a depositional basin is difficult to recognize and predict in the prior art. The prediction method for the overpressured top interface comprises the following steps: selecting a well logging curve corresponding to drilling mudstone according to drilling logging lithology, wherein the well logging curve comprises mudstone electrical resistivity and gas logging abnormity; solving an average value of the mudstone electrical resistivity according to change of drilling depth; and determining the overpressured top interface according to the relation between the well logging curve and the depth.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method for predicting an overpressure roof interface. Background technique [0002] Pore ​​fluid abnormal pressure is a common phenomenon in sedimentary basins, and it is also the most active and active factor in fluid activities and hydrocarbon accumulation in sedimentary basins. The formation and evolution of overpressure in sedimentary basins are closely related to the generation, migration, and accumulation of oil and gas. The distribution characteristics of overpressure geological bodies and overpressure top interfaces have important implications for oil and gas accumulation, drilling engineering, and reservoir engineering. important influence. [0003] The identification of the overpressure top interface of existing sedimentary basins mainly relies on two methods, geophysical methods and geochemical methods. [0004] Geophysical methods mainly rely on the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 李天义周雁何治亮孙炜樊德华朱虹孙冬胜沃玉进
Owner CHINA PETROLEUM & CHEM CORP