Research On Sedimentary Microfacies Of Putaohua In DaQingZi Oilfield

In this paper, based on the data of core-drilling wells, logging, seism of Yaojia Formation in Daqingzi, and sedimentology, logging, structural geology, petroleum geology, as guides, the group is divided into small layers, the sedimentary microfacies of Yaojia formation is carried out, the platform distribution characteristics of sedimentary microfacies of each formation is summarized, and the favorable reservoir sand body is evaluated.Through the research and analysis on Qian157 block and the others founded by now, the potential oil and gas reservoir types of Putaohua formation are determined, the oil and gas accumulation rules are made out, and the favorable block is predicted.On the base of core data, synthesizing logging data as consult and combining with the lower substratum qn3 (delta front) and the sedimentary environment of surrounding area, the core geologic facies of y1 segment in Daqingzi is fluvial facies. By using the method of isopach and isobath, Putaohua reservoir is divided into three sand groups and six small layers and the stratigraphic framework is set up.Through the contrast of electric proper and rocks, the establishment of core geological facies, logging facies analysis and facies model, the determination of sedimentary microfacies of wells and the analysis on platform distribution characteristics of sedimentary microfacies are emphasized. The microfacies types are sediment bar, bottom remains, natural levee, floodplain, crevasse splay and argillaceous sediment. Through exploiting the phase belts in dense wells block and heavy minerals content, the source direction determined is southwest and the sedimentary source is the Baokang river system in southwest.The analysis on sand body lithology, physical properties and flow characteristics of different sedimentary microfacies can determine the effect that sedimentary microfacies on relative reservoir properties and predict favorable reservoir facies zone and reservoir.Through the research and analysis on Qian157 block and the others founded by now, the accumulation models types of Putaohua and the connection between different microfacies and distribution of the oil and gas are determined, as well as the control factors of the favorable oil and gas accumulation block. With the testing and production test data of Putaohua, the favorable oil and gas accumulation zone are determined, and six potential accumulation blocks, Qian157, Qian148, Hei43, Hei53, Hei124, Hei115, are predicted.