A method and device for determining the content of tight oil

Abstract

The embodiment of the present application discloses a method and device for determining the content of tight oil. The method provides a transverse relaxation time spectrum of a target core sample, a first core sample before centrifugation, and a second core sample before centrifugation, and a transverse relaxation time spectrum of the second core sample after the first centrifugation, in the reservoir of interest. relaxation time spectrum; wherein, the first rock core sample and the second rock core sample are respectively used to characterize the target rock core sample under the state of saturated oil and saturated oil-bound water; the method includes: according to the centrifugation before and the described The transverse relaxation time spectrum of the second core sample after the first centrifugation process determines the free oil content of the target core sample; according to the first core sample before the centrifugation process and the second core sample after the first centrifugation process A transverse relaxation time spectrum of the core sample to determine the adsorbed oil content of the target core sample. The technical solutions provided in the embodiments of the present application can realize the quantitative evaluation of the tight oil content in different occurrence states in the reservoir.

Description

technical field [0001] This application relates to the technical field of reservoir development, in particular to a method and device for determining the content of tight oil. Background technique [0002] my country is rich in tight oil resources and has broad prospects for development. Tight oil reservoirs have complex pore structure, poor reservoir physical properties, and complex oil phase occurrence mechanism. To clarify the oil phase occurrence state and proportion, it is necessary to understand the formation of tight oil reservoirs and conduct in-depth studies on tight oil availability and Choosing a reasonable development method has important guiding significance. [0003] At present, the commonly used methods for the visualization of fluid occurrence are CT and scanning electron microscopy, both of which can qualitatively observe the occurrence of oil and water in reservoirs. Due to the small pore throats of tight oil reservoirs, both CT and scanning electron micr...

AI Technical Summary

Problems solved by technology

Due to the small pore throats of tight oil reservoirs, both CT and scanning electron microscopy have some shortcomings in the study of tight oil occurrence: CT analysis has high requirements for samples, for example, a core with a diameter of 1mm corresponds to a minimum resolution of 400nm, and the minimum resolution can only be observed The pore throats to about 50nm have limited representativeness and cannot observe the occurrence characteristics of tight oil in pore throats below 50nm, and the oil-water interpretation is more empirical; the scanning electron microscope has a small field of view, and the representativeness of the obtained results is limited, and it is difficult for the operation High technical requirements for personnel

Images