The Seismic Forecasting Of The Damoguaihe Formation Reservoir In Beixibei Area

Guided by the theory of sequence stratigraphy, reservoir sedimentology and petroleum geology, based on carefully analyzing and referring the research fruits of the predecessors, sufficiently using the data of seismic, well logging and well drilling, adopting several methods of seismic, this paper forecasted and researched the reservoir at the objective of Damoguaihe formation of Beixibei area.First of all, this paper studied the boundary features of Damoguaihe formation basing on the sequence stratigraphy theory. During this process, the identification standards of the interface between formation and segment were established and the dividing lines between formations and segments were confirmed, then the tectonic explanation about the strata of Damoguaihe Formation was carried detaily. Through the research, this paper gave twelve strata units, and the sequence stratigraphic structure was established too.Secondly, on the basis of what had been done in this area, the paper associated single well facies analysis with seismic facies analysis, and analyzed the plane distribution characters of the sedimentary systems in units of segments in this area with seismic, logging and well drilling data, confirming the sedimentary systems development rules: from marginal slope area to concavity sedimentary phase zone are delta plain- delta edge--lacustrine combination; there exist wide front-delta, distributary underwater distributary channel, on the surface the distributary channel are reticular distribution , underwater distributary channel are dendritic distribution. Furthermore, the paper implements seismic attribute analysis with extracted seismic intrabed attributes which are in unit of segments and makes a preliminary forecast about the reservoir distribution conditions of every formation and segment.Seismic inversion showed that different curves are sensitive to sand differently. Formation lithologies and reservoir logging sensibility analysis were put into practice,to find that the sensitive parameter was that can distinguish the sandstone from the shale fairly well. We can conclude the points according to wave impedance inversion: reservoir characteristic varies greatly, the main trend is nothern thin and southern thick, western thin and estern thick; the reservoir is different from facies belt, structure fracture, the favorable reservoir is delta plain and fracture.With applications of the above techniques and analysis about oil-gas accumulation rules and factors in Beixibei area, the paper made comprehensive evaluation about reservoirs in this area, pointing out the favorable part in the future.