Pro Oilfield In Summer 32 And Summer 52 Detailed Reservoir Description Of The Study

After years development, Linnan oilfield has entered high water-cut developing stage. At present, the main contradiction discovered during the development and the geological problems needed to be resolved require urgently using fine reservoir description technology to construct reservoir geological model of present-day condition, guiding the development and improving the development result.Base on fine reservoir description study of Xia 32 and Xia 52 faults in Linna oilfield, the structure microstructure depositional facies reservoir micro-characteristics and so on, the fine geological model has been made; The achievement can be used to comprehensive adjusting, improving the development result, falling of nature decline rate, raising recovery ratio. Good results have been achieved as follows:1.Fine stratigraphy correlation has been made in high resolution sequence and correlation framework has been constructed in the project, barrier feature classification basis and characteristic of seepage field have been stressed.2.High resolution construction and Micro-structure study has been performed and construction characteristic is made clearly, one E2 - upper of E3 reservoir of Xia 52 block is founded. Three micro-structures have been summarized. The positive microstructures, such as little high point and little structural nose, are good for the off-take well's production and the distribution of remaining oil.3.Having systematically studied sedimentary facies, sediment source are from southwest, there developed four integrated delta cycle from middle of Es3 to upper of Es2, middle of Es3 in Xia 52 block is delta front facies deposition, middle of Es3 to upper of Es2 in Xia 32 block is delta plain facies deposition.4.There are three pore structure types in reservoir such as small aperture and little throat, middle aperture and middle throat, big aperture and middle throat, and the intrinsic relationship between pore structure and physical property parameters have been expounded.5. Study the explain of log explanation by the geologic preengage , build up the model of the log explanation, the reserves is recalculated.6.Reservoir log evaluation of shale sand of middle of Es3 in Xia 52 block has been performed, while irreducible water saturation and formation water salinity are the main factors which contribute low resistivity, building up the model of reasonably explanation, increasing geologic reserve 1,000,000t.7.The achievement can be used to comprehensive adjusting, improving the development result, the nature decline rate 29% decreased to 23.5%, raising recovery ratio increased 2.2%, increasing recoverable reserve 330,000t.