鄂尔多斯盆地延长组下组合地层水特征及其油气地质意义

doi:10.12108/yxyqc.20210111

Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 109-120.doi: 10.12108/yxyqc.20210111

• PETROLEUM GEOLOGY • Previous Articles Next Articles

Characteristics of formation water and its geological significance of lower combination of Yanchang Formation in Ordos Basin

ZHOU Xinping^1,2, DENG Xiuqin^1,2, LI Shixiang^1,2, ZUO Jing^1,2, ZHANG Wenxuan^1,3, LI Taotao^1,3, LIAO Yongle^1,4

1. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China;
2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
3. Department of Exploration, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
4. NO.5 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710018, China

Received:2020-07-13 Revised:2020-09-13 Online:2021-02-01 Published:2021-01-25

Abstract

Abstract: The distribution relationship between oil and water of the lower combination Chang 10 to Chang 8 of Mesozoic Yanchang Formation in Ordos Basin is complex,and the characteristics of formation water and its relevance with reservoir are lack of systematic study. In order to clarify the formation water property and its relationship with reservoir,and the influence of formation water salinity on well logging interpretation,based on the selection of formation water samples,through the analysis of more than 10000 formation water samples from Yanchang Formation in Ordos Basin,the properties and distribution characteristics of formation water were studied, and the geological significance of formation water salinity and characteristic parameters were analyzed. The results show that the formation water of Yanchang Formation has the characteristics of zonal spreading distribution. The salinity of formation water of each oil layer group increases first and then decreases from the western margin thrust belt and the axis of Tianhuan depression to the center of the lacustrine basin. The formation water of the lower combination of Yanchang Formation has relatively low salinity,with an average value of 28.4 g/L,which belongs to saline formation water,mainly of CaCl₂ type. The ion composition,salinity,isotope and characteristic parameters of formation water are similar,and obviously different from other formation water characteristics,belonging to the same fluid system. The feature parameters of Na⁺/Cl^- coefficient,desulfuration coefficient and metamorphism coefficient of formation water show that reservoir sealing property of the lower combination of Yanchang Formation is good as a whole. The reservoirs and oil production wells are mainly distributed in the area with relatively high salinity of formation water. Some reservoirs in the western thrust belt have been adjusted and reformed due to the influence of tectonism,and the sealing property of the reservoir became poor. The water layer with high resistivity in the central lacustrine basin and the oil layer with low resistivity in the axis of Tianhuan Depression are developed,and formation water salinity is an important factor affecting well logging interpretation. The research results could provide a basis for the study of fluid system of Mesozoic Yanchang Formation and fine identification of complex oil-water relationship distribution in Ordos Basin.

Key words: reservoir sealing, formation water salinity, oil layer with low resistivity, lower combination of Yanchang Formation, Ordos Basin

CLC Number:

TE133+.2

ZHOU Xinping, DENG Xiuqin, LI Shixiang, ZUO Jing, ZHANG Wenxuan, LI Taotao, LIAO Yongle. Characteristics of formation water and its geological significance of lower combination of Yanchang Formation in Ordos Basin[J].Lithologic Reservoirs, 2021, 33(1): 109-120.

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Characteristics of formation water and its geological significance of lower combination of Yanchang Formation in Ordos Basin

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