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Integrated recognition method for overpressured crack

An identification method and a technology of fracture fracturing, which are applied in the direction of seismology for well logging records, can solve the problems of overpressure fractures that are difficult to identify and identify accuracy, and achieve time-consuming and costly solutions, improve determination accuracy, and improve exploration. The effect on success rate

Active Publication Date: 2015-12-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0007] The present invention aims at the above-mentioned deficiencies in the existing identification of overpressure fracture distribution, and provides a comprehensive identification method for overpressure fractures. The analysis of source rock fracture channels (i.e. overpressure fractures) provides research ideas and methods, improves the accuracy of determining the direction of oil and gas migration, and improves the success rate of exploration

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  • Integrated recognition method for overpressured crack

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Embodiment Construction

[0023] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0024] Take the identification of overpressure fractures in the Bonan sub-sag of Zhanhua sag as an example. image 3 It is a flowchart of a comprehensive identification method for overpressure fractures according to an embodiment of the present invention. The method contains the following steps:

[0025] Step 1: Determine the geological background for the formation of overpressure fractures. The specific steps are:

[0026] According to the statistics and analysis of the measured formation fluid pressure data in the Bonan sub-sag of the Zhanhua Sag, it is determined that the source layers of Sha 3 and Sha 4 in the deep depression zone are overpressured. As an analysis target for overpressure fracture formation.

[0027] Step 2: Core and microscope identification of overpressure fractures, the specific steps are:

[0028] According to the drilling and...

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Abstract

The invention relates to an integrated recognition method for an overpressured crack. The method is used for comprehensively recognizing the overpressured crack and a development zone thereof on the basis of application of geological analysis, core observation and imaging logging information from an overpressured development geology background, so that corresponding features of all types of conventional logging information in the crack development zone are integrated, and conventional logging types with good distinguishing effect and recognition significance and a combination thereof are preferably selected so as to forecast the distribution of the overpressured crack; by integrated analysis, the bottleneck problems that the conventional overpressured crack is hard to recognize and the conventional logging recognition is low in accuracy can be solved; the integrated recognition method has the characteristics of high efficiency, quickness, economy and accuracy; therefore, the recognition cost of the overpressured crack is greatly reduced, and the forecast precision is improved; a research idea and a method are provided for analysis of the overpressured crack in a hydrocarbon expulsion channel of a hydrocarbon source rock; the judgment accuracy of oil-gas transportation direction is improved, the exploration success ratio is increased, large-range popularization in the overpressured oil-containing gas basin is facilitated; the integrated recognition method has active significance for guiding exploration and development of oil gas.

Description

technical field [0001] The invention belongs to the technical field of identification of geological phenomena, and in particular relates to a logging identification technology of overpressure fractures. Background technique [0002] Overpressure fracture refers to that when the mudstone is in a pressure-closed state at a certain depth, abnormal high pressure is generated due to hydrocarbon generation, clay mineral dehydration, hydrothermal pressurization, etc., and when it reaches the critical fracture pressure of the rock, it ruptures. crack. [0003] According to statistics, 90% of overpressure basins in the world are genetically related to oil and gas distribution (LawBE, 1998; Hao Fang, 2005; Ma Qifu et al., 2000). Overpressure is the driving force for the initial migration of oil and gas. When it is greater than the fracture pressure of the formation, micro-fractures, namely overpressure fractures, will be formed. This fracture is an important channel type for the init...

Claims

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Application Information

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IPC IPC(8): G01V1/40
Inventor 刘华蒋有录叶涛张丰荣卢浩
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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