Lacustrine dolomite reservoir in the hinterland of Biyang Sag is mainly distributed at No.2 and No.3 sections of Hetaoyuan with its development controlled mainly by the lithology diagenesis and nose?like structure.

• 泌阳凹陷腹部湖相白云岩油层主要分布在核二3和核三2段,其发育程度主要受岩性、成岩作用和鼻状构造控制。