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Abstract: An old Yellow River delta with a larger distribution and earlier formation (MIS 3) under the Abandoned Yellow River delta in the western part of the South Yellow Sea (SYS). Based on the published studies and relevant research in recent decades, there are three points of view on the sedimentation range of the MIS 3 old Yellow River Delta in SYS: (1) It is distributed from 35°45′N to 34°30′N, between 123°E and 124°E, with the front edge located in deep water; (2) It is distributed from the southern part of Shandong Peninsula (near 36°N) to 34°45′N, between 120°E and 123°15′E, with the front edge located in shallow water; (3) It is distributed from Haizhou Bay to 33°15′N in the north-south direction, and from near shore to 123°E in the east-west direction, with the front edge located in shallow water. The comprehensive analysis of the shallow stratigraphic seismic profiles, borehole sediment ages and sediment characteristics of the Yangtze rivers and Yellow rivers indicates that there is questionable basis for delta identification, such as low temporal resolution of the boreholes and uncertainty of the deltaic material sources. In order to clarify the depositional extent of the MIS 3 old Yellow River delta, we must conduct further in-depth research in understanding of the deltaic sedimentary reflection structure, improving the borehole time resolution, refining the source of deltaic material and strengthening the exploration of the distribution of the terrestrial old delta.Abstract: An old Yellow River delta with a larger distribution and earlier formation (MIS 3) under the Abandoned Yellow River delta in the western part of the South Yellow Sea (SYS). Based on the published studies and relevant research in recent decades, there are three points of view on the sedimentation range of the MIS 3 old Yellow River Delta in SYS: (1)...Learn More
Abstract: Strong bottom water sandstone reservoirs are a type of reservoir with abundant natural energy. During the development process of reservoirs, water drive energy is the main source of energy. At the same time, there are also many problems that arise during water flooding, especially the problems of early water breakthrough and bottom water breakthrough. Through literature research and geological characteristics of the reservoir, combined with previous research on the region, it was found that water drive analysis of this type of reservoir is very necessary. This article mainly analyzes four classic water drive curves, as well as FW-Np and WOR-Np water drive curves, and fits single wells. The fitting effect is comprehensively evaluated using correlation coefficients, calculated values, and actual values. Through calculation, in the water drive characteristic curve, the difference in R2 is not significant when fitting the straight line segment. Relying solely on the correlation coefficient R2 cannot determine the adaptability of the water drive curve well. Therefore, the actual and calculated data are fitted, To comprehensively determine the suitable water drive curve for production wells. Most wells conform to Type A water drive curves, while some wells have good adaptability to Type C, Type D, and WOR-Np water drive curves. In the process of reservoir development, using water drive curves with good applicability, adjusting the development system, predicting the water content and cumulative water production of the reservoir, is beneficial for the development of the reservoir.Abstract: Strong bottom water sandstone reservoirs are a type of reservoir with abundant natural energy. During the development process of reservoirs, water drive energy is the main source of energy. At the same time, there are also many problems that arise during water flooding, especially the problems of early water breakthrough and bottom water breakthrou...Learn More
