桩西洼陷沙四上沉积及储层特征研究

Study of deposit and reservoir characters in Es4 Zhuangxi Subsag

桩海探区是济阳坳陷典型的复式油气聚集区,具有含油层系多、油气丰度高及油藏类型多样的特点,但区带内的桩西洼陷沙四段特别是沙四上的勘探却停滞不前,至今仍未形成产能区块。文章在桩西洼陷沙四下勘探取得认识的基础上,首次提出沙四上洪水漫湖沉积的概念,并对其沉积及储层特征进行了探讨性研究。

Zhuanghai prospect area is a typical multiple oil-gas accumulation area developed in Jiyang depression with multiple formations bearing-oil,high hydrocarbon abundance and variable reservoir types.But it is considered to be difficult to form deliverability block in the Es4 especially the upper Es4 growing at Zhuangxi subsag exploration.The key factor considered is lack of systematic appraisal of deposit and reservoir characters.It is first proposed of the term of flooded lake sedimentary deposited at the upper Es4 and then its deposit and reservoir entrapped characters have been studied investigatively.