顺北超深断溶体储层典型试井曲线特征及类别

Typical Characteristics and Types of Well-test Curves of Ultra-deep and Fault-controlled Formation in Shunbei Region

顺北地区超深断溶体储层主要发育有裂缝及片状洞穴,采用可横向穿越缝洞储集体的水平井进行开发,其试井曲线形态特征复杂多变。依据井筒和表皮效应结束后的中期试井曲线的典型特征,将顺北地区实测试井曲线分成了3个大类。该3大类试井曲线特征直接反映了井与缝洞储集体的不同接触关系。再根据后期的试井形态特征,将顺北地区实测试井曲线细分成了9个亚类,不同的亚类试井曲线特征明显不同,是井外围缝洞发育状况变化的试井曲线响应。最后,提出了与试井曲线特征相对应的3大类9个亚类的试井解释评价物理模型。本文研究成果可用于指导顺北地区的试井分析与试井研究工作,亦可为其他深层断溶体储层的试井研究提供借鉴与参考。

Fractures and sheet cave mainly develop in the ultra-deep and fault-controlled formation in Shunbei region.Horizontal well is adopted in this region to exploit the oil and gas because horizontal well can transversely pass through the fracturedcaved formation.The well-test curves are complex and various.According to the middle curve characteristics after the wellbore storage and skin effects,the real well-test curves of Shunbei Region can be divided into 3 categories.The curve characteristics of the 3 categories can directly reflect the different contact relationship of horizontal well with fractures and caves.In addition,according to the late curve characteristics,the 3 categories can be further divided into 9 subcategories.The curve characteristics of the 9 subcategories differ each other and reflect different development status of fractures and caves in the periphery of horizontal well.At the end,the physical models of 3 categories and 9 subcategories,which are corresponding to the real well-test curves of 3 categories and 9 subcategories,are presented for well-test interpretations and evaluations.The research results in this article can be used to guide the work of well-test analysis and study for Shunbei region,and can also be used to guide the work of well-test study for other deep and fault-controlled formations.