Method for identifying reservoir by combining electrical imaging and reef geologic model

Abstract

The invention discloses a method for identifying a reservoir by combining electrical imaging and a reef geologic model, and belongs to the technical field of marine carbonatite well logging interpretation. The method comprises the following steps of: selecting a carbonatite reef reservoir sedimentary facies model according to a reef reservoir sedimentation model; establishing the correspondence between the reef reservoir sedimentation model and an electrical imaging well logging image characteristic based on an electrical imaging well logging image; establishing an electrical imaging image library of a standard reservoir of the carbonatite reef reservoir; performing rock structure characteristic-based image dynamic enhancement contrast according to images in the electrical imaging image library; and determining a part of a reef phase reservoir, through which a well runs, based on a typical image of an electrical imaging reef phase, and comparing with a typical image of a favorable reservoir to determine the quality of the reservoir. The method greatly improves the coincidence rate of well on-site interpretation and test oil, and is fully applied to various related oil fields in China.

Description

technical field [0001] The invention relates to the technical field of logging interpretation of marine carbonate rocks, in particular to a method for identifying reservoirs using electrical imaging combined with a reef-shoal geological model. Background technique [0002] Reefs and shoals are special marine carbonate structures formed under biological action, which can easily form effective traps and pools. 50% of the world's total oil and gas reserves and 60% of total production are located in reefs, shoals and shoals. Related carbonate reservoirs, and has become an important target of marine carbonate oil and gas exploration in my country. In recent years, a series of reef-shoal reservoirs have been discovered in eastern Sichuan, Tazhong, Western Qaidam, Western Hubei, and the Pearl River Mouth Basin in China, showing good exploration prospects. However, with the deepening of oil and gas field exploration and development, other The difficulty of exploration and developmen...

AI Technical Summary

Problems solved by technology

However, there are serious ambiguities in predicting reefs based on the reflection characteristics on the seismic section and then determining favorable reservoir development sites, because a large amount of actual data shows that reefs with such typical reflections only account for a small part, and most reefs do not. With such obvious reflection characteristics, coupled with the limitation of the scale of seismic measurement, the favorable reservoir prediction results based on this often have large deviations from the actual results

Therefore, as mentioned above, although a lot of research has been done on the prediction of reef-shoal reservoirs in the past, it still cannot fundamentally solve the problem of identifying effective reef-shoal reservoirs faced by oilfields

Images