Study On The Main Controlling Factors Of Putaohua Reservoir In Qingxin Oil Field

Since the late 1990s, Weixing oil field, the work area we studied in this thesis, the reservoir scale is becoming smaller and smaller, oil-water distribution is getting more and more complicated, which constrain the use of remaining reserves seriously, we make a study of the main controlling factors of the interest block are necessary.Based on the detail descriptions on seismic profiles, logging curve features, logging and core datas of the work area and according to the sedimentary characteristics and tracing comparision of various sequence interfaces, we establish sequence stratigraphic framework by taking Geophysics and the Petroleum Geology as theoretical basis and applying sequence stratigraphy, sedimentology and tectonic geology theories and methods comprehensively in this thesis. In the established chronostratigraphic sequence framework, we study sedimentary microfacies and sand distribution, and reveal the space and time evolution regularities of sedimentary system on the basis of analysis of single well facies and well-connecting profiles of skeleton wells. As is shown in the research, the deposits of Putaohua reservoir in this area mainly consist of complex delta extended from Daqing placanticline and Anda direction, which exist distributary plain facies and delta front facies. Seeing from six aspects in the synchroneity among faults and reservoir sedimentation, the scale, direction, subsequence features of fault development, the development correlation between fault and reservoir, the controlling ability of faults to reservoir types, following the studied analysis method—"finding rules in working area, finding potential in blank area", we get a deep knowledge of this area, and point the main controlling factors of this block out. That is, the east-west faults play the role in accumulating, while the north-south faults play the role as migration pathway.The main sedimentation types are fault-lithologic reservoir, fault-sectonic reservoir, fault block reservoir and lithologic reservoir. Based on these, we can predict the profitable exploration areas of Putaohua reservoir of Weixing oil field reasonably.