Research On Sequence Stratigraphy, Sedimentary Microfacies And Configuration Modeling Of Dorine-fanny Oilfield

At present,Tide-dominated estuaries facies are rarely studied at home and abroad.Meanwhile,the type of sedimentary facies is controversial in M1 formation.So,to study the feature of Tide-dominated estuaries facies,not only beneficial to the second development in oilfield,but also important to study Tide-dominated estuaries facies' features.By synthetically utilizing varieties of data such as core,well logging and seismology,sequence in M1 reservoir of D-F oilfield are identified and divided,and then isochronous framework of the M1 reservoir is established.M1 formation is divided into one fourth order sequence,four fifth order sequences such as M1-Zone,M1SS-1,M1SS-2 and M1SS-3.Based on the division of sequence,a research is conducted on sedimentary micro facies model,distribution characteristics and evolution model by the evidence of lebensspur,tectonic evolution and sedimentary structure such as rhythmic stratification,cross bedding and so on.The results show that Tide-dominated estuaries facies and shelf facies are determined in this area which is a transgressive systems tract.Tide-dominated estuaries are mainly developed in M1SS-1,M1SS-2 and M1SS-3,which are subdivided into 4 microfacies:tidal sand bar,tidal sand flat,mixed flat and tidal channel.Shelf facies are developed in M1-Zone,which is subdivided into 2 microdafies:shelf sand and shelf mud.The characteristics of sedimentary facies and sedimentary environment are further analyzed,concluding the sedimentation model:fluvial facies and Tide-dominated estuaries facies—completed Tide-dominated estuaries facies—Tide-dominated estuaries facies and small-sized shelf facies—shelf facies with glauconite sandstone and mudstone.The construction model,the configuration model and the attribute model are established in the study area.In the study purpose,the physical properties of M1SS-2 and M1SS-1 are the best,and the porosity and permeability are concentrated.Porosity and permeability of the higher position usually corresponds to the structure of the sand dam body development location.