Study On Seismic Response Characteristics Of Riverside Reservoirs In Bohai Sea Area

The fluvial facies reservoir is widely developed in the Bohai Bay region of reservoir types, the longitudinal and lateral lithological changes, poor continuity are the main features of it. Due to the depositional environment and hydrodynamic conditions constraints, a lot of sand and clay mixed with sand and mud cross each other development in the Bohai Sea fluvial facies strata, the reservoir is not only thin and often overlap or cross, they bring a lot of difficulties to accurately interpret the river sand. Currently, the prediction and comprehensive interpretation of river sand at the Bohai Sea fluvial facies reservoir, it is not only the crucial issue of oil and gas exploration and development in the offshore, but also is one powerful tool of "increasing reserves and production" in oil fields in eastern China, it is directly related to the wells deployment and success of exploration and development work.In the actual work area of the Bohai Sea sand development process, due to the thickness of a single layer of sand below the seismic resolution,or separated by a single sandwich of muddy sand bodies do not reach the seismic distinguished thickness, lead to the results of fluvial facies sandstone reservoir description uncertainty. Also, present for the lithology changes, the spatial structure of complex, waveforms do not correspond with the lithology in the fluvial reservoir, especially in the quantitative research of lithologic association and seismic response characteristics are still insufficient, there is a strong subjective to select seismic attributes. Therefore, according to distribution of Bohai Sea fluvial facies reservoir sand bodies, this paper establishes the different thickness variation model, the spatial distribution model of river sand, river border recognition model, cut sand body model for forward modeling and attribute analysis, aims at the study on the seismic response characteristics of fluvial facies sandstone reservoir model at Bohai sea and the changing rule in seismic attributes, finally, combined with theoretical models, this paper summarizes thickness variation, spatial distribution characteristics of river sand, river border distribution, cut distribution of river of fluvial facies reservoir in Q oilfield, provides a basis for future exploration work in guiding fluvial facies geological conditions.