可变矿化度油水层多信息综合识别方法——以鄂尔多斯盆地姬塬长9油层为例

Composite Identification Method of Oil-water Bed of Multiform Information on Variable Salinity

针对姬塬长9油层矿化度变化范围大、油水分布规律复杂导致的电阻率测井响应复杂、油水层界限模糊的问题,开展了复杂油藏油水层多信息综合识别方法研究。利用自然电位曲线计算视地层水电阻率,并通过对储层视地层水电阻率的平面分布状况研究,建立了适合此类储层的3种油水层识别测井图版,提出了综合地质和油藏特征进行油水层多信息综合识别的方法。研究成果对地层水矿化度变化较大的低孔低渗复杂油藏评价有一定的借鉴意义。

In allusion to the problems of higher variation range of salinity and complex distribution rules of oil and gas, by which complex response of resistivity logging and unclear oil and gas limits were induced, a methodologic study was carried out on multi-information identification of oil and gas layers in complex reservoirs, natural potential curve was used to calculate the permeability of apparent formation water, and by studying its distribution, 3 chart boards of oil-water bed identification were established for these types of reservoirs. Methods for comprehensive identificating multi-information of oil-water beds are proposed by using integral geologic and reservoir characters. It provides a reference for evaluating the low permeability and low porosity reservoirs with higher salinity variation.