Abstract
The lack of drilling data is a difficult problem in the study of reservoir configuration under the condition of sparse well pattern. In this paper, the seismic data are fully excavated, and the methods of frequency RGB fusion, small scale river sand attribute fusion and horizontal well data combination are used to study the river level, the level point bar level, and the internal configuration of point bar. The frequency division RGB fusion method has a good effect on the characterization of large-scale channel reservoirs, especially the channel stacking period and channel boundary response. The integrated attributes of river channel and sand body distribution method has a good effect on depicting the small-scale end river channel and abandoned river channel, and on this basis, the research on point bar sand body is consistent with the actual drilling. The high-precision edge detection section and RGB fusion section are superimposed to display the development of lateral volume, and verify with the actual horizontal well. River facies reservoirs of different scales have been verified by drilling with targeted research techniques. The results show that under the condition of sparse well pattern, well-seismic combination is the key to the division of small-scale sedimentary units, multi-attribute fusion under high-resolution seismic data is an important means to identify and depict point bar and abandoned river channels, and the application of horizontal well data is a supplementary means to test results and depict lateral accumulation. The research results have achieved good application results in guiding the actual production of oil field.
Highlights
The fine research and characterization of the internal configuration of the reservoir become an important means to tap the potential of the remaining oil in the middle and high water cut stage of the oilfield [1,2,3]
Different seismic research methods are used for different levels of reservoirs, which is very helpful for fine characterization of reservoir structure
In the reservoir study of channel level, the frequency division RGB fusion method can effectively describe the channel stage and channel superposition relationship, which is in good agreement with the actual drilling data
Summary
The fine research and characterization of the internal configuration of the reservoir become an important means to tap the potential of the remaining oil in the middle and high water cut stage of the oilfield [1,2,3]. The reservoir configuration unit in fluvial sand body controls the distribution of remaining oil. It is of great significance to clarify the characteristics of each configuration unit of fluvial sand body and to quantitatively characterize it for further potential exploration of oilfield [46]. There has been a guiding research method of meandering river configuration, but there is no reliable technical means for the study of different levels of reservoir configuration under sparse well pattern [7,8,9]. Three kinds of research methods are used to study the three levels, and good practical results are achieved
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