Prediction for the formation water salinity in low-permeability reservoirs with complex wettability: A case study of the Triassic Chang 8<sup>1</sup> member, Longdong area, Ordos Basin

Cheng Feng; Haitao Fan; Yujiang Shi; Xuekun Chen; Gaoren Li; Zhiqiang Mao

doi:10.11743/ogg20200220

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Prediction for the formation water salinity in low-permeability reservoirs with complex wettability: A case study of the Triassic Chang 8¹ member, Longdong area, Ordos Basin
Vol. 41, Issue 2, Pages: 442-448(2020)
Received：04 April 2018，

Published：2020-04
DOI： 10.11743/ogg20200220
稿件说明：

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DOI：

Cheng Feng, Haitao Fan, Yujiang Shi, et al. Prediction for the formation water salinity in low-permeability reservoirs with complex wettability: A case study of the Triassic Chang 8¹ member, Longdong area, Ordos Basin[J]. Oil & Gas Geology, 2020, 41(2): 442-448. DOI: 10.11743/ogg20200220. DOI：

摘要

测试资料表明，鄂尔多斯盆地陇东地区低渗透储层地层水矿化度变化很大，且储层受到复杂润湿性影响，基于自然电位和储层电阻率~孔隙度组合预测地层水矿化度等经典方法均失效，给储层含油饱和度预测带来巨大困难。因此，在假设储层地层水矿化度与邻近泥岩层束缚水矿化度近似相等的前提下，首先选取邻近泥岩层中稳定部分（高自然伽马、未扩径和低电阻率），读取电阻率和声波时差数据。其次，完成邻近泥岩层声波时差数据的压实校正。然后，通过电阻率和校正后声波时差交会图，实现对不同矿化度下（0~20，20~40，40~60以及大于60 g/L）邻近泥岩层识别，进而提出一种利用邻近泥岩信息确定储层地层水矿化度的方法，预测结果得到了实验分析数据的验证。最后，利用该方法预测了106口井长8

储层地层水矿化度资料，结合69份地层水分析矿化度，绘制了陇东地区长8

储层地层水矿化度平面分布等值线图，有助于地层水矿化度的准确选择和平面分布规律研究。同时，为润湿性影响下的低渗透储层地层水矿化度预测提供了一种可行的解决办法，并具有普遍适用性。

Abstract

The testing data indicate that formation water salinity of low-permeability reservoirs varies in a wide range.What's worse

under the impact of complex wettability

classical methods including spontaneous potential and a combination of reservoir resistivity and porosity fail to predict formation water salinity.This leads to great difficulty in the prediction of reservoir oil saturation.To this end

we proposed a new method to predict the formation water salinity with the results verified by experiments.The new method is shown as follows:assuming the salinity of formation water was approximately equal to that of irreducible

water in adjacent mudstones

we carried out resistivity and acoustic logging in the relatively stable parts with high natural gamma ray

without borehole enlargement and low resistivity in adjacent mudstones; then conducted compaction correction of the interval transit time; and at last identified the mudstones of diverse salinity (0-20 g/L

20-40 g/L

40-60 g/L and

60 g/L) via cross-plotting the resistivity vs.corrected interval transit time.In practice

a contour map of formation water salinity of the study area was drawn by using the formation water salinity of Chang 8

member in 106 wells predicted by this method and in combination with the test results of 69 formation water samples.This is conducive to the selection of formation water salinity and the planar distribution pattern study of salinity.In addition

the newly proposed method in the study serves as a feasible method for the prediction of formation water salinity in low-permeability reservoirs with complex wettability

and is universally applicable.

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Keywords

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