| The data of geologic section in the field,well drilling, geophysics and analysis and test ofgeochemistry were deeply studied through the systematical collection of formation,structure,sediment andthe material of petroleum geology to study tectonic evolvement and condition of oil-gas reservoirgeneration in Suibin depression.The structural contour maps of major structural layer in Suibin depressionare renewed through integrating the renewed interprete of the data of old seismic section with the newdata.Based on it,the structure and sedimentary facies were restudied.The conclusion can be drawn thatthere are 2 sags and 3 uplift in Suibin depression, Some faults control the structure and deposition ofdepression,such as JIANGBIN, PUBEI, JUNCHUAN, SONG1-SONG2 faults and so on. Thethickness of dark mudstone of Dongrong formation is predicted to study the characteristic of source rock bythe use of well-drilling,sedimentary facies and data of the analysis and assay.It can be known that the darkmudstone mainly ties in the middle and east of Suibin depression,the organic matter is abundant,the type ofwhich is mainly TypeⅢ, organic evolvement exent is from high to higher, generates primarily gas andsecondly oil.The peak of oil drain is at the end of Dongrong formation sediment.The peak of gas drain is atthe end of Baoquanling formation sediment. The sandstone thickness of Dongrong formation is predicted tostudy the reservoir condition by the use of well-drilling and sedimentary facies data.It can be known thatthe sandstone mainly lies in the middle and east of Suibin depression,the physical characteristic isweak,the type is belong to lower porosity and lower permeability.The thickness of mudstone caprock ispredicted to study the caprock condition by the use of well-drilling,well-logging and sedimentary faciesdata. It can be known that the mudstone mainly lies in the middle and east of Suibin depression.Thecaprock sealing ability of Dongrong formation in Suibin depression is synthetically evaluated and the resultshows there are mainly better and middle class,trace best and poor class.The ewaluation parameter of gas-transporting ability of sandstone is defined and calculated to study the characteristic of oil-gas transportionand migration of Dongrong formation.It can be known that the relative higher efficiency area is located inthe middle of East Slope zone in Suibin depression.The locomotivity and resistance data of oil-gasmigration are calculated to study the path of oil-gas migration of Dongrong formation.The result showsthat oil-gas migrates from the Nandalinzi sag in the south to East Slope zone. Based on the evaluating resultof source rock,reservoir rock and caprock,the favorable district of oil-gas reservoir generation anddistribution of Dongrong formation in Suibin depression is predicted.The result shows that oil favorabledistrict is mainly located in Fuxing slope,East slope,the northeast of Xinfang sag,locally in Well SuiD2 ofNorth slope and Well SuiDlof the north of Fuxing slope, which has small area,that gas favorable district ismainly located in the northwest of Puyang farm which is common place of Xinfang sag and Fuxing slopeand the middle area of East slope zone,locally in the east of Puyang farm, which has small area and is poorto the distribution and generation of oil-gas reservoir.. Eight parameter which are used as the trapevaluating parameter of oil potential are chosen to evaluated the oil potential of trap of Dongrongformation.The grades of trap are classified according to the influencing exent. The result shows that 14trap are the best trap. On basis of the evaluating result of oil-gas favorable district and traps,it shows thatTrap 18 and Trap 22～Trap 26 are the drilling target.
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