Method for identifying oil-water layer in surface water invasive reservoir
An identification method and reservoir technology, applied in the field of identification of oil and water layers in surface water intrusive reservoirs, can solve the problems of reducing the identification accuracy of oil and water layers in reservoirs
Active Publication Date: 2020-12-25
CHINA UNIV OF GEOSCIENCES (BEIJING)
View PDF9 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At this time, if the crossplot of porosity and resistivity is still used to identify fluid properties in the entire area, it is bound to misjudge some water layers with increased resistivity due to surface water intrusion as oil layers, which will greatly reduce the oil-water density of the reservoir. layer identification accuracy
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 1
[0130] This example provides a method for identifying oil and water layers in surface water intrusive reservoirs. The method is used to identify oil and water layers in a well Yan 7 reservoir in the Pengyang area of the Ordos Basin. The method includes:
[0131] (1) Obtain the spontaneous potential logging curve (SP curve) and natural gamma ray logging curve (GR curve) of the target reservoir in the study area, the results are as follows Figure 6 shown.
[0132] (2) Obtain the first relative shale content of the target reservoir based on the spontaneous potential logging curve; wherein,
[0133]
[0134] In the formula, SP is the natural potential logging value, mV; SP min is the natural potential value of pure sandstone, mV; SP max is the natural potential value of pure mudstone, mV; SH SP is the first relative shale content, v / v.
[0135] (3) Obtain the second relative shale content of the target reservoir based on the natural gamma ray logging curve; wherein,
[...
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 identifying an oil-water layer in a surface water invasive reservoir. The method for identifying the oil-water layer in the reservoir comprises the following stepsof: acquiring the density porosity, neutron porosity and acoustic porosity of a target surface water invasive reservoir in a research area; calculating a normalized density-neutron porosity differencevalue and a normalized density-acoustic porosity difference value based on the density porosity, the neutron porosity and the acoustic porosity respectively; and judging whether the target surface water invasive reservoir is an oil layer or a water layer based on the normalized density-neutron porosity difference value and the normalized density-acoustic porosity difference value. The method adopts a reservoir fluid non-resistivity identification technology, and effectively realizes the discrimination of the oil layer and the water layer in the surface water invasive reservoir.
Description
technical field [0001] The invention relates to the field of reservoir evaluation, in particular to a method for identifying oil and water layers in surface water intrusion reservoirs. Background technique [0002] Accurate identification of oil and water layers is very important in reservoir evaluation and reserve calculation. At present, the most direct and effective method for judging reservoir fluid properties is the crossplot of porosity and resistivity. For conventional oil and gas reservoirs, when the formation water salinity is relatively stable, as the reservoir porosity increases, the pore connectivity becomes better, the fuller the oil and gas filling, the higher the oil saturation, and the corresponding reservoir The layer resistivity is also higher. Conversely, for water layers, as the reservoir porosity increases, the higher the water-bearing volume, the lower the reservoir resistivity. Therefore, using the correlation between porosity and resistivity, the f...
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 Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 肖亮刘蝶张海涛李高仁郭浩鹏
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)