The Research Of Hydrocarbon Accumulation Conditions And Exploration Objectives Of The Fu117 Well Section In FULIN Sag

Fulin Sag lies on the southeast of Zhanhua Depression,which apart from Gunan depression with Kenli fault belt,border upon Kendong-Qingtuozi arch,and overlayed with Chenjiazhuang arch.Fulin Sag has the area about 360 square kilometers.FuLin depression faulting have significant differences whether on a plane or on a vertical,showing the activity intensity is strong on northeast and weak on southwest on plane;vertically,the next Es3 sedimentary intensity of activities is stronger than any other periods.On the basis of seismic interpretation,with logging data,lithology and core data,the integrated application of various methods to identify the sequence boundary.The sand three-sand sec of FuLin depression was totally identified to 5 ? sequence boundaries,correspondingly 5 ? sequences in the sand three-sand sec of FuLin depression.Combined with the results of the previous sequence stratigraphy of sand-four,sand-first and sand of Dongying,the ancient system interior was divided into nearly eight long period cycles of base level,and further divided into 14 cycles of middle base level.Based on the study of the structure and trap conditions,the fracture development characteristic and distribution rule in the study area are clearly known about.On the basis of core observation,the shahejie formation in the study area consists of fan delta,nearshore subaqueous fan system,river delta system and the system of lakes(including turbidite fan system).By analyzing the drilling,logging,seismic data and geological maps,knowing the rule of the plane distribution of sedimentary facies in the study area and vertical evolution characteristics clearly.By researching the main control factors of properties and the reservoir physical properties the distribution characteristics of the favorable reservoirs in the study area has been clear about.The distribution of oil and gas in fulin subsag is very unequally,oil and gas mainly distributed in best structure trap and buried hill traps at the north side of syncline in the steep wing,the north and northwest of middle sub-depression and the both sides of Kenli fault.The oil in the middle of the Kenli fault is continuous distributed.A small part oil located in the eastern depression in the western of Fu7 – Fu xie151-Fu15 high tectonic belt.Above the structure and trap conditions,sedimentary system and favorable reservoir distribution research,on the basis of comprehensive analysis of oil source conditions,conditions of oil and gas migration,we build three main control factors of oil accumulation in the study area:(1)the structural high planar distribution and trap conditions control reservoir,and(2)the reservoir conditions control accumulation of Es3-Es4,(3)assemblages controlling longitudinal accumulation.Based on the analysis of the above,the next step prospecting direction of Fulin Sag is still mainly in times of depression around,especially continue to dig kenley fault zone,actively explore fault zone in the east and north of the east sub-sag.