| Dongxin complex fault block oil field. By the end of 2006, has drilled the exploration well amount to 2911,discovered 34 oil fields; Accumulation explored oil area sum 1340.32km2 ;Ascertain petroleum geology reserves access 23.1×108t, The control oil areas attain 254.1km2; the control petroleum geology reserves sum 1.78×108t, accounts for 49.1% and 32.4% of the Dongying sag. It making the significant contribution to the sustained and stable development of the Shengli oilfield.As the oil exploration and development goes continuous increasing in Dongying sag. The oil exploration situation is getting more and more severe, the exploration difficulty increases day by day, the potential of large-scale and simple oil pool in Es1 and E3s2 members are getting fewer and fewer. The small and complex reservoirs of E3s3 member are raised high respect. Becoming the important battlefield of increasing product in recent years, therefore develop lithologic oil reservoirs effective has the vital significance affect on product. This article is precisely in view of this complex lithologic oil reservoirs of E3s3 member in Dongying sag, research on depositional system and oil accumulation. Reveals the oil formation law, Establishes the Lithologic oil reservoirs forming, thus instruct this lothological oil pool's exploration and development effective.The system of sediment and oil accumulation law in E3s3 member research main comprehensive geology data,seismic data, log data, producing text data . Using high resolution sequence stratigraphy, the event sedimentology and so on new theory, establishes the new deposition system and the depositional mode, studies the stratum lateral change and the vertical evolved rule in every unit. In view of the defect in hydrocarbon accumulation mechanism research, we combine new oil geology theory with the research of hydrocarbon generation, accumulation, cover, migration, trap, conservation, which contain hydrocarbon bearing system,fluid compartment and Hydrocarbon accumulating dynamic.Developing deposition system and the oil accumulation research, reveal the oil forms rule, establishes the oil accumulation mode. Proposing structure, sedimentary facies, reservoir, cap rock are the major effect factors of oil accumulation in studied area. Oil accumulation is the advantageous space and time match result, while it is affected by each kind of factors comprehensive. thus instruction lothological oil pool's economy effective exploration and development of E3S3 member.The main works of this research contains: rock cast slice analyse, Scanning electron microscope, X- beam diffraction, electron probe spot, cathode luminescence, image analysis, sizing test, capillary pressure curve, rock nature analysis, inclusion temperature measurement, trace element analysis, petrochemical analysis, oil inclusion hydrocarbon compound saturated hydrocarbon gas chromatography, oil inclusion hydrocarbon compound saturated hydrocarbon chromatograph/mass spectrum. Completed studied area charts contain as follows: 150 individual well facies analysis Sections of wells , main sand distribution geologic section, the Stratum framework'Seismic cross-section and Geological cross section of the E3S3 member; fine stratigraphic correlation chart and the main purpose unit sand contrast chart completed ,research area deposition schema chart, the sedimentary facies, the sedimentary microfacies distribution chart ,the overlap contact graph of the South bulge area, the accumulate capacity analysis chart of different microfacies , oil source contrastive analysis chart, the main factors analysis chart of the hydrocarbon accumulation, typical reservoir section charts, exploration goal plane and section charts.Basing on large numbers of basic researches, several conclusions have been achieved as follows:1. A new strata framework model has been built through sequence stratigraphic division and correlation by using the method of continental high resolution sequence stratigraphy, which has provided a new foundation for building sedimentary system and hydrocarbon accumulation model in studied area.2. A well recognition of sedimentary system of E3s3 through the built sedimentary system model could be used to ascertain reservoir genetic type and lateral variation characteristics.3. The source material is comprehensively analyzed by such information as sandstone thickness distribution, ratios of sand/mud distribution, strata thickness distribution, dip information, rock and mineral distribution and sedimentary structure, and the major source directions, southeast and southwest, converged in both Xianhezhuang and Haojia area making the paleocurrent system more complicated.。4. The relationship of reservoir four property has been researched again to build logging interpretation model and get the reservoir property parameters providing quantitative physical property parameters for reservoir evaluation and hydrocarbon accumulation forcasting5. Growth fault has controlled the material source, sedimentary system and hydrocarbon distribution, and turning gravity flow is also formed under the control of the fault.6. The growth fault in studied area has strongly controlled sedimentation and hydrocarbon accumulations, such as material source, forward turbidite fan and sedimentary system distribution. In addition, the heterogeneity of hydrocarbon accumulations in upper, middle and lower member of E3s3 is also affected by the long period of fault activities.
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