The Study On The Sedimentary Microfacies And Petroleum Play Prediction Of Dongying Formation Of Lujiazhuang In Raoyang Sag

Lujiazhuang region, locates in the central of Rao Yang sag with the research area of about104square kilometers, belongs to liuxi broken slot belt and liuchu anticline between southern excessive area, in the two tectonic belt combing part formed many complex broken small fault blocks group. Because of the stratum faults of oil reservoir, poor property, monolayer thickness thin, the generally conventional oil test production is low. Therefore, research the sedimentary facies, analysis favorable sandbodies distribution, and give a research on the reservoir characteristics and the distribution of favorable reservior can guide the next step of oil exploration. Based on the above, the oil and gas exploration’s new breakthrough can be realized in tectonic trap such as structural trap, lithologic trap, stratigraphic traps and lithologic-structural trap or non-tectonic traps.On the basis of observation and description of the core,combining the analysis of the regional geologic settings, applying the new theory and technology of the combination of the geology and geophysics,following the research path of point(well)-line(profile)-plane(planar map)-tract(temporal evolution and geophysics distribution)-point(potential sand bodies), the sedimentary micro-facies of Dongying formation of Lujiazhuang in Raoyang sag was studied and the potential zones were predicted in this thesis.Through the above researches, the achievements of this thesis are as follows:1、With the high-resolution sequence principle, based on the core observation and logging analysis, by the standard of base level cycle and the chang process of the accommodation space which was concomitant with, according to the stratigraphic contact relations and lithologic association, applying the principle of maker beds control, cycle division and correlation, a feasible comparative model was established, the stratigraphic correlation of42wells was completed. Dongying formation was divided into9base-level cycles. Through the identifying of every log, we built up the framework of isochronous stratigraphic correlation among several logs, and moreover, in the frame of base-level cycle, we discussed the sedimentary facies and depositional system.2、Coming to the study of sedimentary system and sedimentary facies, firstly, through the observation and analysis of its core,such as the petrology characteristic、 color、sedimentary structures、paleontology and vertical sequence. Secondly, by comparing the curves to those without-core logs, we set up the mode of electro-facies. With the guiding of it, we differentiated the facies of every log, then we analyzed the profile facies. Under those results,we decided the sedimentary facies and depositional system. Research shows that:Dongying formation of Lujiazhuang in raoyang sag is a typical meandering river deposit, and it could been further divided into riverbed and phase, bank and phase,flood and phase. In work area of development in a flood, natural levees, crevasse-splays, channel sand dam, and points the facies,etc,and the sedimentary facies pattern is established.3、Based on single well phase analysis and profile phase analysis, with the guidance of the depositional model, combining with the paleo-geomorphology, seismic attribute and tectonic characteristics, the sedimentary facies plane was drawn in the period of dongying formation. On the plane, the process of back for water was from the third section of east to the first section of east, water area was decreased. With the adoption of the analysis methods of the store layer upon layer and a Multidisciplinary research methods and techniques, the space distribution channel sand body was characterizes in the greatest degree.4、The focus in this area for further exploration is structure-lithologic trap. Sand body form:a plane to a tape, a section of the article lens shape; North of the river to the east to give priority to, and structure to bias, easy to form structure-the lithology composite traps.5、Through the research work of area of hydrocarbon accumulation conditions, the conclusion that the research on the research work area of the favorable reservoirs have formed geological conditions is drawn:first it has plenty of oil and gas source. Then it has a good high hole, high permeability and the hole, permeability reservoir in clastic rocks and good cover of oil and gas, and development of good oil and gas accumulation trap, then it has favorable reservoir-cap born combination, also has good preservation conditions. In addition to those,these are many kinds of traps and favorable source-reservoir-seal assemblage. From these researches,we can conclude that this area may has one favorable objective zones:Dongying formation reservoirs of the DaWangZhuang fault frontier in northwest area.