Research On The Distribution Law Of Jurassic Reservoirs In Yanwu-Sancha Area And Optimization Of Production And Construction Targets

The Zhenyuan-Yanwu-Sanchao area straddles the Yishan Slope and Tianhuan depression,In the western part of the thrust belt,it has the present structural pattern of “high in the east and west,low in the north and south,and mid-dragon”,local development of nasal uplift in this study area.The palaeogenomorphology of the former Jurassic developed three branches of the river valley,and showed the form of "the north slope,the middle branch ditch and the South highland".The braided river delta plain deposits were developed in the Jurassic Yanan formation 9 to 7 period,while the 10 period was the braided river deposits.Based on the study of the law of enrichment of oil and gas,three types of reservoir-forming models have been extracted: “Plot formation on the slope of the river valley,accumulation of ancient highlands near the river,and accumulation of sandstone on the interglacial hills”.The matching of the structure of the nasal uplift and the channel sand formed a good reservoir with a flat "bead like" distribution and formed a ten million ton Jurassic reservoir group.Combined with the exploration and development practice,to explore suitable for Zhenyuan area "shallow reservoir building production technology system,it can boost the oil production and production.