Jing'an Oilfield Tigers Hilly Chang 6 Reservoir Evaluation And Three-dimensional Modeling

This paper focuses on the topics of reservoir modeling and evaluation, mainly illustrating the accurate contrasting and division, sedimentary micro-faces and sand body distribution characteristics, reservoir characteristics and synthesized evaluation from Chang 6 of Hu Lang Mao area, Jing'an oilfield. Based on applying the methods of face controlling and random modeling, the 3D reservoir model has been established and the reservoir characteristics are exposed from different sides and levels. The mainly fruits and knowledge as follows:1 , Through applying the basic principles and methods of high-resolution sequence stratigraphy, the formations of 98 wells have been contrasted accurately and divided. Study indicates that Chang 6 locates between the K0 and K5 sediment transfer face of long-term base-level half cycles. The sand body develops. The top of the sandstone relies on the cap rock and the bottom contacts the source rock directly. The condition of hydrocarbon accumulation is favorable. Finally Chang 6 has been divided 6 mid-term base level cycles. The combination of them is unsymmetrical obviously. Upside half cycle develops and downside half cycle doesn't develop. Totally it is a water ascend sequence. Based on the study of high-resolution sequence stratigraphy, leveled by maximum flooding surface, the level lines of chang 6 traditional strata division theme has been collated mainly and the framework of sequence stratigraphy of chang 6 contrast and division has been established.2, The area locates the Shanbei delta front in Yanchang formation period of the Ordos basin. Based on regional sediment environment, through core observation and description, Chang 6 has been divided into 2 sub-faces and 7 micro-faces. The distributary channel and the distributary mouth bar are the main reservoirs of the area. According to the principle of superiority faces, the sedimentary micro-face maps and the sand thickness maps have been established respectively, which made a solid foundation for the reservoir evaluation and the geological model.3, According to the statistics of core analysis data, the average porosity is 12.0% and the average permeability is 0.68×10-3 μm2, which is extremely low porous and extremely low permeable reservoirs. Applying the method of corrected well log interpretation data by core analysis data, the functions of correcting well log interpretation data were established: the function of correcting porosity is (?)corr=1.2023×(?)log-2.2787 , the function of correcting permeability of chang 612-2, 621-1, 621-2 reservoirs is kcorr1=exp (0.363×(?)corr-5.2) ,and the function of correcting permeability of chang 611, 612-2, 622, 631 reservoirs is Kcorr2=exp (0.31×(?)corr-3.9) . Based on these functions, the correction porosity and permeability of well logging were gained. The synthesized evaluation of the reservoir in this area has been made from different sides by applying storage coefficient, formation coefficient and flow band exponent. The reservoirs has been divided 3 types and pointing out I type reservoir mainly distribute in chang 612-2 and 621-2 , which areas are about 65.5km2.4, Through applying reservoir description software GOCAD2.0.8 of EdS corporation, USA, using the methods of facie controlling and random modeling, according the process: establishing reservoir structure modeling â†' establishingreservoir framework modeling controlled by the facie â†'establishing reservoir properties modeling controlled by the facie, the 3D concept modeling of Hu Lang Mao exploration area and the 3D accurate modeling of the test area have been established which exposed the development characteristic of the reservoir from different aspects and made a further step in geological knowledge.5, The fruits of the study has been applied the production of 2004 timely , which acquired good effect: first, improved the total efficiency of productivity construction of 2004, which made the production of each well rise 1.5t/d compared to 2003; Second, applying zonal injection technology, which made the correspondence of injection well and oil well rise to 55.0%(before zonal injection is 26.3%). The injection profile has been improved obviously.