Abstract
The upper Ming section of L oilfield is a typical offshore heavy oil bottom-water reservoir with thick fluvial layers. All horizontal wells are developed by natural energy. Due to the few drilling holes and influence by the resolution of seismic data, it is difficult to describe reservoirs with thickness over 20 meters. In this paper, seismic resonance amplitude inversion technology is introduced to restore the real response of thick reservoirs and interbeds by drilling and drilling verification, and the geological bodies with different thickness are displayed by frequency division RGB three primary colors. Flow units of heavy oil reservoirs with bottom water are divided according to the three major factors of interlayer, lithologic internal boundary and water-oil thickness ratio which have the greatest influence on horizontal well development, thick sand bodies are divided into 10 different flow units in three levels, each unit is separated from each other, and the reservoir structure, water-cut characteristics and water-flooding characteristics are different. The reliability of the research is improved by using the dynamic data of horizontal wells and newly drilled passing wells, which provides a basis for tapping the potential of heavy oil reservoirs with bottom water.
Highlights
Since Hearn C.L. put forward the concept of flow unit in 1984, [1] [2], many scholars have expanded the concept by studying reservoir characterization and reservoir evaluation
Seismic resonance amplitude inversion technology is introduced to restore the real response of thick reservoirs and interbeds by drilling and drilling verification, and the geological bodies with different thickness are displayed by frequency division RGB three primary colors
Flow units of heavy oil reservoirs with bottom water are divided according to the three major factors of interlayer, lithologic internal boundary and water-oil thickness ratio which have the greatest influence on horizontal well development, thick sand bodies are divided into 10 different flow units in three levels, each unit is separated from each other, and the reservoir structure, water-cut characteristics and water-flooding characteristics are different
Summary
Since Hearn C.L. put forward the concept of flow unit in 1984, [1] [2], many scholars have expanded the concept by studying reservoir characterization and reservoir evaluation. Taking L oilfield as an example, starting from the original earthquake, this paper discusses the flow unit research method of combining frequency division method with bottom water reservoir attributes under the condition of few wells in offshore oilfields. Limitation of large-scale and uncertain original seismic data, to dissect deep frequency data, to study the distribution characteristics of residual oil in water cut rising and passing wells according to the development practice of all horizontal wells in the oilfield, to carry out the study of flow units under the condition of large offshore well spacing, and to open up a new way for tapping potential remaining oilfields or even comprehensive adjustment in the later period. We can analyze the applicability and differences of this method in different oilfields, and fundamentally put forward suggestions for seismic re-acquisition, but this method can be popularized and applied in ultra-thick layers [4] [5]
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