<p>With the continuous decrease of conventional oil and gas resources in the Ordos Basin, oilfield development has gradually shifted towards unconventional resources such as tight oil. To address this, research was conducted on the accumulation mechanism and geological “sweet spot” distribution patterns of tight oil in Yanchang Oilfield. Three types of advantageous tight oil zones were classified, their geological parameter indicators were explored, and the influencing factors of tight oil distribution in Chang 7 and Chang 8 layers were determined from two aspects: geological “sweet spot” influencing factors and engineering “sweet spot” influencing factors. Research shows that the sandstones of Chang 7 and Chang 8 oil layers in the study area are generally low-permeability tight lithologic reservoirs with no obvious oil-water differentiation. The oil layers are controlled by reservoir physical properties and sedimentary facies zones. The oil reservoir interface generally presents a gentle west-dipping monocline structure. Locally developed low-amplitude nose uplift structures have no obvious relationship with the range of oil reservoir traps and the distribution of main oil layers. The Chang 7 and Chang 8 oil layers in the Ordos Basin mainly have two types of source-reservoir configurations: “source-reservoir” integrated type and “source-reservoir” adjacent type. Among them, Chang <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({8}_{2}^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mn>8</mn> <mrow> <mn>2</mn> </mrow> <mn>2</mn> </msubsup> </math></EquationSource> </InlineEquation> belongs to Class I sweet spot area, Chang <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({8}_{2}^{1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mn>8</mn> <mrow> <mn>2</mn> </mrow> <mn>1</mn> </msubsup> </math></EquationSource> </InlineEquation> belongs to Class III sweet spot area, Chang <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({8}_{1}^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mn>8</mn> <mrow> <mn>1</mn> </mrow> <mn>2</mn> </msubsup> </math></EquationSource> </InlineEquation> belongs to Class I sweet spot area, Chang <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({8}_{1}^{1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mn>8</mn> <mrow> <mn>1</mn> </mrow> <mn>1</mn> </msubsup> </math></EquationSource> </InlineEquation> belongs to Class III sweet spot area, and the northern Yuchahua 18 area of Chang 7₂ is a Class I sweet spot area, while the Yuchahua 50 well area is a Class III sweet spot area.</p>