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泌阳凹陷下第三系核桃园组总体上表现为一个大的湖退体系，而其中的微量元素含量及有关元素比值却呈现出细微而明显的旋回变化特征。本文依据泥岩、页岩和碳酸盐岩中Ｔｉ、Ｓｒ、Ｂａ等十六种微量元素含量及Ｓｒ／Ｂａ、Ｆｅ／Ｍｎ、Ｓｒ／Ｃｕ等七种比值的变化特征，结合古盐度及岩相资料，对核桃园组沉积时的古气候作了系统的研究，基本上分出了温暖潮湿、干湿交替、炎热干旱、温热半干旱四类较为特征的古气候类型，以期为油气勘探提供依据
The Lower Tertiary Hetaoyuan Formation in Biyang Depression shows a large lake retreat system as a whole. However, trace element contents and related element ratios show a subtle and obvious gyration characteristic. According to the characteristics of sixteen trace elements, such as Ti, Sr and Ba, and the ratios of Sr / Ba, Fe / Mn and Sr / Cu in mudstone, shale and carbonate rocks, This paper systematically researches the paleoclimate during the deposition of the Hetaoyuan Formation and basically divides into four types of paleoclimate characterized by warm and humid, alternating wet and dry, hot and dry, warm and semi-arid, Provide evidence