Difference Of Ordovician Strike-slip Fault And Regularity Of Oil And Gas Accumulation In Aman Transition

The Aman transition is located between the Awati depression and the Manggar depression.It is located in the middle of the Tarim Basin,south from Katalin,north to Shaya uplift,east from the Mangar sag,and west to the Awati depression.It is a special uplift structure,which is characterized by a gentle uplift in the east-west direction and a concave shape in the north-south direction.It is generally a low-amplitude anticline and slope zone in the north-north east,which is an important oil and gas area.In this paper,through three-dimensional seismic interpretation,physical simulation experiments,vertical breakage analysis,stress field simulation and other research methods,the fault characteristics,segmentation,main activity period,formation mechanism,difference and hydrocarbon accumulation law of the Aman transition zone are studied.The research focuses on the difference of the strike-slip fault of the Aman transition zone,analyzes its genetic mechanism,analyzes the difference of the strike-slip fault zone in the Aman area and its influence on oil and gas enrichment,and summarizes the law of oil and gas enrichment in the Aman area.The research shows that the main fault zone of the Aman transition zone has the characteristics of plane segmentation,upper and lower stratification,multi-stage superposition,and development of various tectonic styles such as vertical linear,complex flower,and negative flower,and develops typical structural styles..According to the fracture breakage layer,the difference of the upper and lower stratification of the interface,the location of the location with the largest vertical fault,and the nature of the fracture,the four stages of the strike-slip fault of the Aman transition zone are determined,namely,the Middle East of the Caledonian III,Caledonian Late-early Haixi,late Hercynian,Yanshanian-Xishan period.The main activity period of the Shunbei No.5 fault is the Middle East of the Caledonian III.Its activity intensity is larger than that of the Shunbei No.1 fault.The Shunbei No.1 fault is formed in the late Caledonian fault and is the branch fault of the Shunbei No.5 fault.Because the local stress field difference is superimposed with the multi-stage fault,there is a great difference between the main fault zone of the Aman transition zone and the same fault zone at different locations.It is these differences that make the fault zone have distinct segmentation and form different types of segments,which control the degree of fracture development,and the degree of fracture development determines the scale of reservoir development,and then controls the accumulation of oil and gas.In addition,the stronger the fault-bearing faults on the fault zone,the higher the degree of reservoir transformation is,and the oil and gas is enriched in the corresponding parts.Therefore,the fault zone along the northeastward strike-breaking basement developed along the Caledonian mid-slip zone is the most favorable zone for reservoir development and hydrocarbon accumulation in the Aman transition zone,and the reservoir development scale in the southern part of the fault zone is larger than that in the north.The oil and gas enrichment degree of the section is greater than that of the vertical linear section and the compression section.