润湿性影响下低渗透储层地层水矿化度预测——以鄂尔多斯盆地陇东地区三叠系延长组长81段为例

doi:10.11743/ogg20200220

石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (2): 442-448.doi: 10.11743/ogg20200220

• 方法技术 • 上一篇

润湿性影响下低渗透储层地层水矿化度预测——以鄂尔多斯盆地陇东地区三叠系延长组长8¹段为例

冯程¹(), 樊海涛², 石玉江³, 陈雪昆⁴, 李高仁³, 毛志强^5,*()

1. 中国石油大学(北京)克拉玛依校区石油学院, 新疆克拉玛依 834000
2. 中国石油新疆油田分公司勘探开发研究院, 新疆克拉玛依 834000
3. 中国石油长庆油田分公司, 陕西西安 710018
4. 中国石油新疆油田分公司采油一厂, 新疆克拉玛依 834000
5. 中国石油大学(北京) 地球物理学院, 北京 102249

收稿日期:2018-04-04 出版日期:2020-04-01 发布日期:2020-04-03
通讯作者: 毛志强 E-mail:fcvip0808@126.com;maozq@cup.edu.cn
作者简介:冯程(1988-),男,博士、副教授,岩石物理,复杂及非常规储层测井评价。E-mail:fcvip0808@126.com
基金资助:
新疆维吾尔自治区自然科学基金青年基金(2017D01B57)

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

Cheng Feng¹(), Haitao Fan², Yujiang Shi³, Xuekun Chen⁴, Gaoren Li³, Zhiqiang Mao^5,*()

1. Faculty of Petroleum, China University of Petroleum(Beijing) at Karamay, Karamay, Xinjiang 834000, China
2. Research Institute of Exploration and Development of Xinjiang Oilfield Branch Company Ltd., PetroChina, Karamay, Xinjiang 834000, China
3. Changqing Oilfield Branch Company Ltd., PetroChina, Xi'an, Shannxi 710018, China
4. No.1 Oil Production Plant of Xinjiang Oilfield Branch Company Ltd., PetroChina, Karamay, Xinjiang 834000, China
5. College of Geophysics, China University of Petroleum(Beijing), Beijing 102249, China

Received:2018-04-04 Online:2020-04-01 Published:2020-04-03
Contact: Zhiqiang Mao E-mail:fcvip0808@126.com;maozq@cup.edu.cn

摘要/Abstract

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8¹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8¹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。

关键词: 湿润性, 地层水矿化度, 低渗透储层, 延长组, 鄂尔多斯盆地

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 8¹ 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.

Key words: wettability, formation water salinity, low-permeability reservoir, Yanchang Formation, Ordos Basin

中图分类号:

TE122.2

冯程,樊海涛,石玉江,等. 润湿性影响下低渗透储层地层水矿化度预测——以鄂尔多斯盆地陇东地区三叠系延长组长8¹段为例[J]. 石油与天然气地质, 2020, 41(2): 442-448. doi: 10.11743/ogg20200220 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

图/表 7

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图4

图5

图6

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井	总矿化度/(g·L^-1)	井	总矿化度/(g·L^-1)	井	总矿化度/(g·L^-1)	井	总矿化度/(g·L^-1)
Well 1	7.51	Well 2	9.96	Well 3	12.15	Well 4	16.17
Well 5	17.14	Well 6	18.25	Well 7	18.6	Well 8	18.72
Well 9	19.97	Well 10	20.82	Well 11	20.86	Well 12	21.16
Well 13	23.03	Well 14	23.40	Well 15	23.74	Well 16	24.26
Well 17	24.58	Well 18	24.89	Well 19	25.11	Well 20	26.79
Well 21	26.80	Well 22	26.92	Well 23	27.34	Well 24	27.43
Well 25	27.62	Well 26	27.72	Well 27	28.29	Well 28	28.60
Well 29	28.98	Well 30	29.44	Well 31	29.99	Well 32	31.77
Well 33	33.44	Well 34	33.95	Well 35	34.78	Well 36	35.74
Well 37	37.25	Well 38	39.75	Well 39	41.35	Well 40	42.06
Well 41	43.25	Well 42	44.23	Well 43	44.30	Well 44	44.56
Well 45	45.05	Well 46	47.24	Well 47	47.70	Well 48	48.09
Well 49	48.10	Well 50	48.83	Well 51	49.09	Well 52	50.23
Well 53	53.90	Well 54	54.05	Well 55	55.19	Well 56	56.82
Well 57	57.27	Well 58	59.90	Well 59	61.22	Well 60	62.97
Well 61	64.15	Well 62	64.62	Well 63	69.65	Well 64	72.59
Well 65	82.05	Well 66	84.97	Well 67	89.69	Well 68	104.10
Well 69	106.53

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润湿性影响下低渗透储层地层水矿化度预测——以鄂尔多斯盆地陇东地区三叠系延长组长8¹段为例

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

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