王窑南区长6段储层参数及有效厚度下限研究

Research on the Reservoir Parameters and Net Pay Cut-off Thickness of Chang-6 Member in South Wangyao Region

王窑南区长6段储层是石油勘探开发的重要层位,优化目的层位储层参数解释模型及确定储层有效厚度下限,能对储层特征进行定量评价和避免有效厚度漏失。本次研究通过薄片鉴定、取芯、测井等资料对研究区目的层位的"四性"关系进行了研究,认为长6储层发育高自然伽马砂岩,其在测井响应特征方面与邻近常规储层有一定的差异。因此分别对常规储层和高伽马储层建立泥质含量、孔隙度、渗透率及含油饱和度等油层参数的解释模型,提高了储层参数计算精度;并结合试油及测井资料确定了长6油藏有效厚度下限标准:孔隙度为10.4%,电性下限声波时差为218μs/m,电阻率为10Ω·m,为王窑南区进一步开发提供了科学依据。

The Chang-6 reservoir of the South Wangyao region is an important layer for pe- troleum exploration and development. The reservoir parameters of interpretation model are optimized and the net pay cut-off standard of the objective section in the region is con- firmed, which can quantitatively evaluate reservoir characteristics and avoid the loss of ef- fective thickness. In this paper, the four-property relation of the objective section is studied by thin section, core data, logging, showing that this section develops high natural gamma sandstone, the logging response characteristics of which is different from that of adjacent conventional reservoirs. Therefore, the interpretation models of mud content, porosity, permeability, oil saturation for conventional sandstone reservoir and high natural gamma sandstone reservoir are respectively built up, which improves the precision of reservoir parameters. Combined with single testing and logging data, this paper establishes the porosity and oil saturation, acoustic time difference and resistivity cross-plots, it is concluded that the net pay cut-off standard： the porosity is 10.4%, the acoustic time is 218μs/m, the resistivity is 10Ω·m, which provides a strong basis for the further development of the South Wangyao region.