吴起一铁边城油田长6储层四性关系及有效厚度下限研究

为提高目的层段油藏测井解释和有利区域预测的精度，利用砂岩薄片、铸体薄片和扫描电镜等技术手段并结合测井资料对吴起一铁边城地区长6储层的“四性”关系进行研究，认为长6储层属于典型的中孔低渗油藏；储层岩性主要为细粒长石砂岩为主，成分和结构成熟度均中等；岩性、物性的差异控制了储层油藏的富集程度，确定了储层物性下限的标准：孔隙度为7．5％，渗透率为0．1×10μm^2，电性下限电阻率为12Ω·m，声波时差为214μs／m。从而为长6油藏进一步开发评价和增储上产，提供了有力的依据。

Research on four property relations and net pay cut-off thickness of Chang6 reservoir of Wuqi-Tiebiancheng oilfield

In order to improve the accuracy of well logging interpretation of target layer reservoirs and favourable region prediction, this paper conducted research on ＂four property relations＂ of Chang6 reservoir in Wuqi-Tiebiancheng area by using technical means of sandstone thin slice, casting sheet and scanning electron microscope, and combined with logging information. It is deemed that Chang6 reservoir is typical medium-porosity and low-permeability oil layer. The reservoir lithology is dominated by moder- ate-fine grain arkosic sandstone with its ingredient and structure of medium maturity. The distinction of lithology and physical prop- erty controll hydrocarbon accumulation degree and determine the lower limits standard of physical property as follows： porosity is 7.5 %, permeability is 0. 1 × 10-3μm2, resistivity of the lower limits of electric property is 12 Ω·m, acoustic interval transit-time is 214 us/m. The results provided reliable references for further development evaluation and stimulation of Chang6 reservoir.