Method for calculating reservoir fracture porosity
A technology of fracture porosity and porosity, which is applied in calculation, earthwork drilling and production, design optimization/simulation, etc., can solve the problems of poor regularity of response to fractures in both lateral directions and difficulty in calculating fracture porosity in response-insensitive reservoirs, etc. Achieve the effects of strong operability, convenient promotion and application, and high calculation accuracy
Active Publication Date: 2017-10-27
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to solve the problems of poor regularity of response to fractures in double lateral directions and difficult calculation of fracture porosity in response insensitive reservoirs
The present invention proposes a method for calculating fracture porosity by reconstructing dual lateral resistivity using acoustic wave AC and density DEN, which solves the difficult problem of fracture porosity calculation in areas where dual lateral resistivity is not sensitive to fracture response
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment approach
[0030] According to an embodiment of the present invention, a kind of method for calculating reservoir fracture porosity is provided, comprising the following steps:
[0031] (1) Calculate the acoustic porosity PAC and density porosity PDEN. For example, the power time formula is used to convert the acoustic wave AC and the density PDEN into the corresponding porosity.
[0032]
[0033]
[0034] Among them: AC ma : Pure rock formation acoustic skeleton value 180; AC f : The sound wave value is 620 when the pure rock stratum is full of water. DEN ma : Pure rock formation acoustic skeleton value 180; DEN f : The sound wave value is 620 when the pores of the pure rock formation are full of water.
[0035](2) Correct the relative size of the acoustic porosity PAC curve and the density porosity PDEN curve. For example, the left and right scales of the acoustic porosity PAC curve and density porosity PDEN curve measured by logging are adjusted so that the acoustic porosi...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for calculating reservoir fracture porosity. The method comprises the following steps of converting an acoustic wave AC curve and a density DEN curve into an acoustic wave porosity PAC curve and a density porosity PDEN curve; correcting the acoustic wave porosity PAC curve and the density porosity PDEN curve; identifying a high angle fracture and a low angle fracture according to relative values of corrected acoustic wave porosity PAC value and density porosity PDEN value; establishing a function relationship among an acoustic wave AC, density DEN and resistivity Rt; determining parameter values in a high angle fracture function and a low angle fracture function; and solving the reservoir fracture porosity. The method is strong in operability, is intuitive and clear in identification, reduces the production cost, improves the economic benefits, and has wide application prospects; and the method steps can be conveniently popularized and applied to the exploration and development of various stratums, so that the method has very high application values.
Description
technical field [0001] The invention belongs to the field of oil and gas exploration and development, in particular to a method for calculating the porosity of reservoir fractures. Background technique [0002] Fracture porosity is one of the important indicators for evaluating the effectiveness of fractures, and its numerical calculation accuracy directly affects the reliability of fractured reservoir evaluation. In recent years, the development of new logging technology series represented by the full-bore formation resistivity imaging logging (FMI) technology provides high-resolution image data for the identification of fractures and high-precision calculation of fracture porosity. Due to the control of cost and other factors, the number of wells with new technology logging is limited, which cannot meet the needs of reservoir evaluation in the exploration and development of oil and gas reservoirs. Therefore, conventional logging data is most widely used in today's fracture...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20
Inventor 李浩王丹丹冯琼魏修平
Owner CHINA PETROLEUM & CHEM CORP