Research On Accurate Reservoir Prediction And Hydrocarbon Forming Charecater Of Putaohua Formationin In Zhaoyuan-Taipingchuan Area

Zhaoyuan-taipingchuan area lie in north Songliao basin, across Sanzhao depression, Chaoyanggou terrace, Changchunling anticlinal zone, Binxian-Wangfu depression and Suihua depression, Putaohua formation is most important contains oil goal formation in this area center lower part to contain oil combines, the recognization can not fit in with the exploration, based on the theories and means of sedimentology, sequence stratigraphy, petroleum geology and so on, from the fine research of sequence frame work, sedimentary facies, forming type, store condition, and generalize on hydrocarbon forming condition and host controlled hydrocarbon factor,pointed out new objects and orientation of exploration.Research on sequence and sedimentary shows that with the control of fourth order sequences, there are 6 fourth order sequences in Putaohua reservoir , from below,SB1,SB2 system tract can develop favorable reservoir,and SB3 in Zhaoyuan-Taipingchuan are lake sedimentary.through sedimentary micro-facies research ,we know that in the east of placantieline sedimentary facies have annular distribution, from marginal uplift area to concavity sedimentary phase zone are delta plain- delta inner edge- delta outer edge-lacustrine combination, the east and south part are mainly develop plain sedimentation;there exist wide front-delta, distributary channel and underwater distributary channel, on the surface the distributary channel are reticular distribution , underwater distributary channel are dendritic distribution. advantage phase zone oil-control obviously, the distributary channel and mat sand are enrichment, it often cut the fracture and generate structural-lithologic reservoir.The reservoir prediction is mainly describe the sand and connectivity,overcome inversion multiple solutions. seismic inversion show that different curves are sensitive to sand differently, wave impedance curves are hard to distinguish the boundary of sand and mudstone ,resistivity curve takes second place。We can conclude the points according to comparison different methods of inversion : stochastic inversion and reconstitute inversion are ideal methods to areas with high degree of exploration and high well spacing density。In vertical direction,it can be identify sand body within 1 m; In the areas with low degree of exploration, low well spacing density, thin reservoir Monte-Carlo - Markov chain inversion method and reconstitute inversion are suitable to describe sand .Hence we can should take different methods to predict the reservoir according to different conditions of the prospect.According to the study of seismic inversion, the reservoir characteristics is notheren tichk and southern thin, the channel sand is present intermittent distrrbution,and sand is mainly thin layer,and is different from facies belt. In the north it is near from sediment source,the profile of inversion is out of fracture,and is developed in both walls.In the sourth,it is mainly developed delta external front,and the sand connectivitied badly.Because of waters energy is sick,the sand is controlled by fracture obviously,the mainly channel is extension and thin out. In the sale of sand characteristics in wells, curve reconstruction is presented,the sand is simulated equiprobability among wells sbased on sand characteristics.The probability high frequently is selected,and improved reliability of prediction in order to finishing reservoir characteristics.According to the study of structure and rift system,Shengping nosing structure and Zhaozhou nosing structure ,close to the hydrocarbon generation, long-term inherited structure with high-uplifted area and developed faults through the oil source, are favorable for accumulation of oil .It is also proved by exploratory survey. Yushulin structure, a nosing structure is hard to accumulated for large volume of hydrocarbon deposit because of its deficiency of structure,lithologic character and other elements。Fracture acts as channel during active period,through which the hydrocarbon migrate from source rock to the reservoir ;During repose period,fracture acts as plugged zone.Fracture-developed areas with different origin have different accumulation model with major fault and different.According to evolutionary history,Sanzhao sag'peak period of expelling hydrocarbon was at the end of sedimentation time of Mingshui formation。We can judge whether the faults are source faults from three respect:if the faults are through the source rock to reservoir,if the faults are source faults within the valid boundary of expelling ,if the faults are activate or unsealing during the period of expelling。We can judge in the region of interest with consideration of growth factor,elongational velocity, vertical and lateral seality .We summarize three factors control the reservoir type, distribution of hydrocarbon as follow:1,It is favorable area of structure-lithology reservoir in Shengping-Xingcheng structural belt;2,Distribution of oil and water is affected by source fault,channel sand and fault sealing organic combination in Yushulin oil field;3,It is key factors whether the reservoir development effected in Fengle,Fenglenan,Zhaoyuannan area;We can segregate the deposits in Zhaoyuan-taipingchuan area to three types :anticlinal reservoir relevant to faults ,lithologic hydrocarbon reservoir relevant to faults,fault block hydrocarbon reservoir relevant to faults,It can be subdivided to seven subtype,summarized to two reservoir formats。Finally we can submit three favourable target。...