Hydrocarbon Accumulation Characteristics Of Deep Carbonate Rocks In The Fault Shb4 Zone In Shunbei Area

The deep-ultra-deep carbonate rock in the Shunbei area of the Tarim Basin is rich in oil and gas resources and has made major breakthroughs in oil and gas exploration.Taking the Fault SHB4 as the research object,this paper studies the accumulation characteristics of deep-ultra-deep fracture-cave carbonate oil and gas reservoirs in the Fault SHB4 zone by integrating geology,logging,seismic and experimental analysis,and achieves the following main results and understandings:(1)The Fault SHB4 oil and gas reservoir is distributed in the Upper Ordovician Unification Room Formation and the Yingshan Formation,with a high gas-to-oil ratio,and is an ultra-deep high-temperature atmospheric pressure condensate gas reservoir.The reservoir types are mainly cave type,hole type and fracture type,and the overall storage of tensile segment is better than that of extrusion section and translation section.The collective development of the core reservoir of the main fault zone of the tensile segment,the collective development of the fracture zone between the sections of the pressure section,and the collective development of the internal reservoir of the fault zone of the translational section.(2)The Fault SHB4 is connected to the source rocks of the lower Yuertusi Formation as a whole,and has medium-strong source characteristics.The conductivity of Fault SHB4 is mainly affected by the deformation characteristics of the fracture and the paste salt layer,among which the development of escape and thinning type paste salt in the pressure ridge section has good conductivity.The uplifted push-overturned paste salt and the extruded micro-uplift paste salt developed in the pull segment,and the struded microuplift type paste salt developed in the translational segment,and the conductivity was relatively poor.(3)The Fault SHB4 has the characteristics of vertical migration + lateral migration and accumulation of oil and gas,and the charging dynamics are episodic charging with low dynamics.It experienced late Caledonian,late Hercynian-Indosinian,Himalayan(4)The Fault SHB4 tension segment is the concentrated accumulation mode of Zhongtongyuan-Middle Transmission-Low Power Curtain Charging-Main Fault Zone Nucleus;The pressure lift section is a reservoir formation mode with differential enrichment in the strong source-strong transmission-low power curtain charge-fracture fracture zone.The translation section is a homogeneous accumulation mode in the middle source-medium transmission-low dynamic curtain charge-fault zone.