A Study On Reservoir Characterization And Distribution Of Remaining Oil Of Complicated Faulted-Blocks, In Tai 190 Area, Da-Qing Oil Field, China

The study area lies in Tai 190 Area in southern Daqing Placanticline, Songliao Basin. With approximate 50 km2 in area, it is a rather complicated faulted-block. Consists of about 70 m thick clastic rocks and bounded by faults, the Putaohua oil reservoir is in the middle-upper part of Lower Crataceous. It has been exploited more than 20 years and 829 thousand ton oil has been producted. Owning to structure interpretation, seismic reservoir prediction and log secondary interpretation, the 3 dimension geological model is built up with stochastic modeling technology. Further more, some suggestions for further exploitation are given by synthetically analyzing the producing status of reserve and situation of production of each zone. The research conclusions and views are as follows:1) The structural interpretation in past showed that there were many irregular faults with straggling extension direction in Tai 190 Area. But according to the structural interpretation in this turn, the faults are extended to NNE and NNW directions, and this result is conform to the previous research conclusion of the stress field in the study area.2) The Yaojia Formation and the upper part of the underlying Qingshangkou Formation consist of a depositional sequence. From the bottom to the top 4 times of lacustrine eustasy occurred during the depositional period of the Lower Member of Yaojia Formation. The lacustrine water was deeper in the period of PI3 and PI1 than in any other periods of the Lower Member of Yaojia Formation.3) Under the guidance of sedimentology, the distribution of thin sand body with 3 or 5 meter is predicted by combining some new technologies in these years, such as spectral decomposition, seismic classification, parametric inversion and strata grid with reservoir performance.4) With the core data from the Tai 190 area and its adjacent area, multi-log interpretation models are built up. For the wells without sonic logs, the porosity model is built up by using the SP and micro-normal log. The two models are both fit in the study area.5) With facies orienting technology the 3 dimension geological stochastic model is built up as the static model for further reservoir simulation in the Tai 190 Area.6) On base of 3 dimensions geological model and simulation, the direction for further exploitation is given by summarizing the control factors of remaining oil and synthetically analyzing the producing status of reserve and situation of production of each zone.