Research On The Reservoir Pool-Forming Condition And Explorative Targets In Kenxi Area Of Jiyang Super Depression

The Kenxi area of Jiyang super depression is abundant multiple accumulative oil and gas trap zone, located in a slope zone between the Bonan depression and Gudao uplift. On the basis of former working experience (reference literature), and using methods of 3D seismic data interactive interpretation systems including logging constraint seismic inverse technology, an exact geologic model of Kinxi area including recent exploration wells, borehole loggings, well loggings, and complete 3D Seismic data has been established. There exist two kinds of hydrocarbon pool-forming models, these being the lateral and vertical migration-accumulating models. Using as the base of the Dynamic Systems for Pool-forming, all associated reservoir types and d istribution have been studi ed, incl uding accumulation and pool-forming models. This has provided objective knowledge concerning the condition of prospective underground reservoirs, and this knowledge can be used for the direction of further hydrocarbon exploration and development in this area.The main thrust of this study are follows: the primary study provides in detail the area structural properties including the fault systems, structure units, and trap types; the secondary study including the sedimentary systems including stratigraphic classifications, depositional environment properties, infilling-evolution properties, and oil source analysis; the third area of study including the geologic property of the north slope zone; and the final area of study provides an analysis of gas and oil accumulation, the types and distribution of reservoirs, and the pool-forming models used.The main thrusts are as following: the Kenxi area lies in the slope zone between the Bonan Depression and Gudao up lift, with a Mesozoic sub-strataproviding a big slope background elevated in a series of steps from the Bonan depression south towards the Kenxi horst, and then east towards Gudao uplift, and so has been affected both by the movement of the Gudao uplift and the sinking of Bonan depression. In this area, four north-dipping synsedimentary faults have occurred which strike northeast-east and descend in a series of steps from the south to the north. There were two main hydrocarbon pool-forming periods in this area, with trap types and oil density being different in time and space. The largest difference found was in the vertical distribution of hydrocarbon pools along the synthetic and the antithetic faults. The later migration-accumulating pools of hydrocarbon includes types Es4 and Es3; the vertical migration- accumulating pools contain hydrocarbon types Es3 and Es4. Reservoirs here are distributed along the fault zone and the southern slope of the Bonan depression.Using the above accumulated data, this study can be used as a basis for new explorative targets in three sand deposits to the north of this study area, providing some likelihood of exploration success.