Abstract
In the Daqing oilfield, Heilongjiang Province, China, in the eastern part of the Sabei II District is a fi ne potential-tapping demonstration area with a long development time and complex history of well conditions. As oil exploration has entered into the high-water cut stage, the fine description of reservoir structure had a great significance to improve the effect of oil exploration. An abandoned channel is an important basis for recognizing a single river border and point bar. The top sand-shale interbedded or muddy sediments have a shelter action for the reservoir fluid, so correctly recognizing the abandoned channel is an important scientific basis for further analysing reservoir architecture and exploring the remaining oil. Due to the lateral shelter action of sand-shale interbedded with muddy sediments, the semi-connected body, consisting of abandoned and normal channel sand body, leads to an injection and production imbalance, which is namely production without injection or injection without production. It makes the top of the channel sand body become the favourable gathering place for remaining oil and a further main exploring object.
Highlights
In terrestrial clastic rock reservoirs, the sand body of a point bar in a meandering river is one of the most important hydrocarbon reservoirs
The impact of lateral accretion on the oil and water migration of the reservoir depends on the interbed occurrence, density related to the number of lateral accretion bodies in the point bar, extending scale as well as the relationship between the injection and production well groups
In the process of actual oil exploration, muddy deposition at the top of a suddenly disposable abandoned channel or sand-mud interbed at the top of a gradually disposable abandoned channel can have lateral shelter action, which becomes one of the important factors affecting the relationship between injection and production
Summary
In terrestrial clastic rock reservoirs, the sand body of a point bar in a meandering river is one of the most important hydrocarbon reservoirs. With the deepening of exploration and development, especially in the high-water cut stage of the internal reservoir (Legleiter et al, 2011; Alho and Mäkinen, 2010), due to the presence of non-permeable thin interlayers such as lateral accretion, exploring the remaining oil becomes increasingly difficult. It has become the core work for contemporary reservoir description to accurately identify the spatial distribution form and distribution range of the point bar sand bodies (Pearson and Gingras, 2006; Braudrick et al 2006). In view of the characteristics of the large well spacing and the sparse well pattern in offshore oilfields, Tingen Fan (Tingen Fan, 2016) makes full use of logging data and seismic data to quantitatively differentiate the fluid seepage shielding effect of different configuration interfaces in reservoirs, so as to solve the problems of continuity and connectivity of fluvial facies sand bodies
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