Study On The Sedimentary Feature And Reservoir-forming Model Of Fuyang Formation In Xingbei Area

Based on sedimentology and Petroleum geology, this study take full advantage of wellcore, well logging, the3-D seismic data and Production dynamic data, etc in this area.Through meticulous dissenting close well spacings,Fuyang oil layer is divided into3formationgs,17small layers,48sedimentation units. Using methods of sequence stratigraphicfine correlation, such as closed skeleton profile,3-D seismic data, Characteristic layers, etcarchive well to well fine correlation of region, established Fuyang oil layer high-resolutionsequence stratigraphic framework. On the base of regional sedimentary background and thefacies of the coring well analysised, we can recognize that the study region mainly developedthe delta distributary plain and the delta front surfaces included distributary channel,overbank lice, branch interchannel, submerged branch channel, sand sheet and the submergedbranch interchannel microfacies and so on. River channels, which are mainly S-N, are themainly reservoir sandbodies of Fuyang oil layer.Taking the theory of the palaeostructure recovery as guidance, through analysiseingpalaeostructure evolution on the top of the Fuyu formation in various periods systematically,we summed up it into six stages of palaeostructure evolution. Mother rock of Fuyang oil layeris qn1in Qijia~Gulong valley. The key period of the Reservoir-forming is the final phase ofthe Nenjiang5layer to Mingshui2layer. Researchment of palaeotectonics and migrationindicate: palaeotectonics and the distribution of mother rock are the mainly reasons of Fuyangformation oil distribution divergence in Xingbei area. On the base of mastering new idea ofmodern petroleum geology and distribution of its sandbody, combined with otherinformations, such as the data of the structure, deposition, reservoir, oil test and loginterpretation, through analyzing types of found reservoirs systematically, this paper analysed:region of interest locate the migration pathway, the channel sand which is rounded bymudstone combined with fault form the mainly trap. The block trap and the litho stratigraphictrap are optimum Reservoir-Forming Model. Based on all the conclusions above, twofavorable regions can be predicted.