Chacteristics Of Hydrocarbon Carrier And Role In Deep Reservior-formation In The North Zone Of Dongying Sag

Migration carriers play a vital role in controlling of hydrocarbon migration and accumulation and quantitatively characterize its transform capacity is the core and cutting-edge research direction of hydrocarbon accumulation dynamics. Dongying depression north deep is the key areas of oil and gas exploration in Shengli Oilfield, however, effective research methods of migration carriers composed of complex sandbodies and faults is exile under the background of steep slop. Because of this, Upper Es4 in the middle part of north steep slope in ShengTuo region is selected for the research target in this dissertation, sandbodies and faults is studied, methods to establish composite hydrocarbon carrier framework and methods to quantitatively characterize the transform capacity of migration carriers is explored. This study not only has important theoretical value,but also has important practical meaning of oil and gas exploration targets’ determination in the study area. Through research papers obtained the following results:In the study area, most of reservoirs are lithology reservoirs and structure-lithologic reservoirs.Reservoir is characterized with low porosity and permeability and strong heterogeneity.Shengbei fault and Tuo94 fault, downthrown turbidite fan sands, rising plate nearshore subaqueous fan sands formed a ladder migration mode.The sandbody is multi-phase stacking aside the roots of boundary fault and its thickness and its heterogeneity is very high. Migration layer unit definition and characterization of its connectivity is very difficult. Because of this we divide the upper Es4 into two migration layer unit(Es4scs and Es4scs) and using the sandbody’s non-isochronous envelope of upper Es4 as the top boundary of the Es4 scs migration layer unit and using stable interlayer as the middle boundary. We ascertain the thickness of migration layer through the lower limit of lithology and porosity and permeability and electrical characteristics. We use the Ns(the thickness of effective migration layer to thickness of migration unit ratio) to characterize the geometric connectivity of migration layer and using the product of effective migration layer’s thickness and porosity to characterize the fluid connectivity.The activity of Shengbei fault and Tuo94 fault match reservoiring period well in Dongying period. Fault connectivity probability is used to characterize the fault opening and sealing probability and it indicate that Shengbei fault and T94 fault have a high connectivity in the deep. The fault connectivity probability distribute like “wave” in lateral direction. The fault connectivity is high in the sandbody-rich postion. This postion is the effective hydrocarbon migration area.At last, three-dimensional composite hydrocarbon carrier framework model of deep lyer in ShenTuo region is established though the three-dimensional structure modeling and property modeling. With the combination of hydrocarbon expulsion quantity and fluid potential features, the effectiveness of migration carriers and pattern of hydrocarbon migration and accumulation is analyzed. Hydrocarbon migration and accumulation area which is matched well to the migration dynamics condition fit the oil and gas pools that have been found. This approve that the method is feasible and effective. Block of Tuo26, Tuo174-Tuo175 and Tuo163-Li98 can be advantageous areas of exploration.Chacteristics of Hydrocarbon Carrier and Role in Deep Reservior-formation in the North Zone of Dongying Sag...