Fine Geology Study On Shahejie Formation Of Qu103Fault Block In Qudi Oilfield

Qu103Fault Block is the key exploration block to Luming oil and gas explorationand development company of Shengli Oilfield. Target strata oil layer of Shahejie belongsto the typical complex fault blocks oil reservoir. With the further development of theoilfield, the challenges of the water cut rises quickly, water injection effect, complementformation energy shortage, production decline, leading to oil production decline of recentis increasingly severely. Therefore, in order to guarantee the stable and high yield, it isnecessary to carry out the fine geology Study for Shahejie of Qu103block.On the basis of digesting and absorbing predecessors’ research results, the finegeology Study for Shahejie of Qu103block was carried out thoroughly undering theguidance of high resolution sequence stratigraphy, sedimentology, structural geology,development geology, logging geology, etc. During the research, the information aboutgeological, seismic, logging, testing, coring and core analysis data, etc. was appliedsynthetically. Through the front research, the fine geological model was established. Goodresults have been achieved as follows:(1)Through Fine stratigraphic correlation, the stratigraphy framework and wasestablished. And Sha1layer was found at lower location of the structure in the Northwestof Qu103block. And the unconformity between Guantao formation and Member1ofShahejie formation, Member1and Member3of Shahejie formation, Member3and UpperMember4of Shahejie formation, was established. Finally the main sands group includingMember2, Member3and Upper Member4of Shahejie formation was divided into24small oil-bearing layers.(2)Application of coherent analysis technique, the faults of Qu103block wereinterpreted finely. Compared with the original, the new fault number of the Member3ofShahejie formation increase from16to22. And the new fault number of the UpperMember4of Shahejie formation increased from21to24.(3)By logging second interpretation, physical interpretation model is established.Under sedimentary facies constraints， the research which include the characteristic of reservoir heterogeneity, and barrier distribution, reservoir distribution, oil distribution andso on, was carried out.(4)On the basis of the oil distribution characteristic, the standard about oil-waterinterface was established using the information about well drilling, logging, developingdynamic, well test and production test. According to this standard, the oil-water interfaceof27oil sand body of Qu103block was defined.(5)Through statistical analysis of the distribution characteristics of reservoir fluid, thereservoir is controled by the three facors of structure, lithology and stratigraphicunconformity, which structure is the main controlling factor, second is a lithologic andstratigraphic unconformity.(6)Through double calculation, the original oil geological reserves is2385000tons.Compared with before, the data is increased by365000tons. The Analysis ResultIndicates the geological reserves Member3and Upper Member4of Shahejie formation ofQu9-14block oil-bearing area and effective thickness change of Qu103block is a majorcause of reserves increase.Through this study, the structure and the reservoir was cleared, a unified structure andreservoir model was established, the geological reserves was checked.at the same time, thestudywill lay a solid foundation for the next comprehensive adjustment in Qu103block.