Study On Sequence Stratigraphy And Subtle Trap Of West Slope In Songliao Besain

Recent years,The resources potentiality of heavy crude oil in the west slope needs deeping the understand of the petroleum geology and evaluating the exploration potentiality in the west slope accurately. The article does the fine study on the sequence, microfacies and reservoir prediction in order to meet the need of the exploratory and development, which is based on the reservoir sedimentology, the sequence stratigraphy and the core, well drilling and seismic data.The objective interval is divided into eleven fourth order sequence based on the high resolution sequence stratigraphy and the core, well drilling and seismic data. The article builds the sequence framework and the correspondence between the sequence and the sand member,and analyses the fill-style and the control factor on the sequence.The section is affected by multi-provenances .By means of the heavy mineral, the palaeogeomorphology and the hydrodynamic force analyse, the article point out there are different provenances in different periods, which are the QiQiHaEr ,YingTai and west brachy-diagonal provenances in the GaoTaiZi period. When to Nengjiang period, the QiQiHaEr and west brachy-diagonal provances quit the section .The north provance in the SongLiao basin access the section.Studying on the form and evolvement method of the facies is based on the core and several analytical data. Detal front faces is the leading environment in the period of the GaoTaiZi and the SII+III. There is mainly shore-meare environment in the SI–S0 period.The rule petroleum distribution rule is that the oil distribution is controlled by the sequence stratigraphy,microfacies and structure. The fine study on the JiangQiao point out that there is the updip pinch out oil and gas accumulation which affected by water flushing.Forecasting of profitability zone in the JiaoQiao area use the oil and gas accumulate rule and the sedimentology characteristic. The result is that the west peripheral zone in the JiaoQiao area is the latent lithologic trap for the facies and theunicline formation at the period of the GaoTaiZI and SII+III resevior.The article supplies the geological foundation for the eyemark optimize at the earlier days of the exploitation.