Analysis Of Sedimentary Characteristics And The Saturation Of Quan 4th Member Of The Fuyu Oil Layer, Honggang Oilfield In The South Of Songliao Basin

This thesis, by taking Quan 4th member of Lower Cretaceous in Hong 75 block, Honggang oil field, central depression in south of Songliao basin as research object, based on the analysis of microfacies and reservoir characteristics, by taking research on SO in sealing coring well as study center, deeply analyzes the study methods of SO in sealing coring well and its pros and cons, confirms the distribution characteristics of SO in study area, analyzes its controlling factors and proposes the beneficial target.Based on the analysis of depositional setting and facies mark, the thesis ascertains that Fuyu oil layer develops braided delta and the subfacies of delta front can be divided into delta front body and delta front end. The delta front body has good physical property and its porosity is above 8%, it belongs to beneficial oil accumulation zone and delta front bodies of member 1,2,6,10 develop well. The sandstone of reservoir spreads NNW-NW. The high thickness of sandstone develops in northwest and center of the study area, and it changes thinner to dactylitic pinchout in the direction of southeast. The physical property of reservoir has apparent relationship with sedimentary facies.The area with high porosity over 6% mainly develops in delta front body, two belts spreading NE except for west of the study area.The main lithology is lithic arkose and the average porosity of reservoir is 8.21%, the average permeability is 0.256×10-3μm2, and the reservoir belongs to low porosity ultra-low permeability, slender throat-micro throat reservoir. According to directly measuring actual data from sealing coring H75-9-1, relative permeability and wettability experiment, mercury intrusion J function method, NMR experiment, rule logging and NMR logging, the thesis gets the SO. On the basis of comparative analysis, it indicates that we can directly measure and get the exact SO from the core experiment in acceptable leakproofness and distillation condition; we can get the max SO from mercury intrusion J function method and NMR experiment, which is adaptable for high-saturated oil reservoir; relative permeability and wettability experiment is unfit for evaluating SO. The SO from core experiment has big error for evaluating oil and water isostrate low-saturated, unsaturated and saturated oil accumulation. The method of using core calculating logging and getting SO costs little and has short cycle, also it can evaluate oil and water isostrate reservoir of low-saturated, unsaturated and saturated oil accumulation. Rule logging,combining with special logging method, evaluating SO can get high accuracy; While NMR logging, the special logging method has some error for evaluating the SO, and it needs further exploration.This thesis analyzes the SO distribution characteristics of 12 members of Fuyu oil layer, using rule logging method subdividing 105 wells of the study area, and interpreting different parameters of the reservoir. The research indicates that the SO has good correlation with sedimentary microfacies. The high-value area of SO over 40% mainly develops subaqueous distributary channel microfacies in delta front body; the SO and porosity also have good positive correlationship, and the high-value area of SO over 40% mainly develops in the area with porosity over 8%.Finally, based on comprehensive evaluation of reservoir characteristics, sedimentary microfacies and the SO distribution characteristics and so on, the thesis proposes beneficial roll extension targets, near the line of H75-6～H75-8-26,and the line of H75-37-25～H87-4～H88-2.