| Moliqing rifted basin lies on the south of Yitong rift valley, on the north of which is Luxiang rifted basin and Chaluhe rifted basin. The work area Moliqing oid field is a flatten basin of Tertiary. The tectonization of Shuang’er formation is complex, which causes the multi-source sedimentary, complicated facieses and the quickly changed reservoir. In order to unmask the complicated facieses to decide exploitation program we have to find out the tectonic character then under the control action of sequence theory to analyze the source sediment direction and the sediment facieses.This paper integrate the core data, well logging, seismic data and production data using the sequence theory and sedimentary theory to analyze the facieses.First, on the basic of the former studies of sedimentary sources , this paper uses the detrital component and sand proportion data, gets the following results : the work area has four main sediment sources, southwest, northwest, northeast and southeast.Second with the observation and description of the core data, the facieses is systematically analyzed though the sedimentary structure, log facieses character and the tectonic pattern, the facieses sign is founded as the proof of the facieses..Then, though the analysis of single well and corresponding well sections, we get that the this area mainly develops fan delta, near shore subaqueous fan, sublacustrine fan and limnal facies. The fan delta mainly develops in the southwest of the work area, during the earlier time; the near shore subaqueous fan manly develop on the southeast, while the sublacustrine fan manly appears in the latter sediment in the north of the work area, and the rest place mainly shows limnal facies.On the base of the above work we carry on the work to indentify the micro facieses. Then according to the specification of the facieses figure, we draw the sedimentary facies figure of the work area and get the vertical evolution of the facieses in this work area. |
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