Hydrochemical characteristics and hydrocarbon response of stratum water of Ahe Formation in Eastern Kuqa Depression

ZHANG Haizu; XU Tong; XIE Yani; ZHANG Huifang; FAN Shan; CHEN Changchao; ZHU Chuanqing

doi:10.12029/gc20210830002

GEOLOGY IN CHINA > 2024 > 51(6): 2017-2027. > DOI: 10.12029/gc20210830002

Zhang Haizu, Xu Tong, Xie Yani, Zhang Huifang, Fan Shan, Chen Changchao, Zhu Chuanqing. 2024. Hydrochemical characteristics and hydrocarbon response of stratum water of Ahe Formation in Eastern Kuqa Depression[J]. Geology in China, 51(6): 2017−2027. DOI: 10.12029/gc20210830002

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Hydrochemical characteristics and hydrocarbon response of stratum water of Ahe Formation in Eastern Kuqa Depression

ZHANG Haizu^{1, 2,},
XU Tong^{3, 4, ,},
XIE Yani^{1, 2},
ZHANG Huifang^{1, 2},
FAN Shan^{1, 2},
CHEN Changchao^{1, 2},
ZHU Chuanqing^{3, 4}

1.
R&D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, Xinjiang, China
2.
Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China
3.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
4.
College of Geosciences, China University of Petroleum, Beijing 102249, China

Funds: Funded by the commissioned scientific research project of Tarim Oilfield Company (No. 041020050021) and the National Science and Technology Major Project (No. 2017ZX05008-004), and Special Project for Tackling Key and Applied Technologies of China National Petroleum Corporation (No. 2023ZZ14).

More Information

Author Bio:
ZHANG Haizu, male, born in 1976, Ph.D., senior engineer, majors in petroleum geology; E-mail: zhanghz-tlm@petrochina.com.cn
Corresponding author:
XU Tong, male, born in 1997, Ph.D. candidate, majors in geological resources and geological engineering; E-mail: 1113822424@qq.com.
Received Date: August 29, 2021
Revised Date: October 21, 2021

Graphical Abstract

Abstract

Abstract

This paper is the result of oil and gas exploration engineering.
Objective
As the carrier during the oil and gas migration, stratum water plays an important role in oil and gas accumulation. The oil−water distribution of the Jurassic Ahe Formation (J₁a) oil and gas reservoirs in the eastern Kuqa Depression of the Tarim Basin is complicated, and the characteristics of stratum water and its relationship with oil and gas reservoirs are lack of systematic study.
Methods
In order to clarify the chemical characteristics of stratum water and its relationship with reservoirs, based on the selection among stratum water samples, the test data of Ahe Formation in eastern Kuqa Depression are obtained to study the distribution of water type, TDS and ion−proportionality coefficients of stratum water and its significance to reservoirs.
Result
The stratum water of J₁a is mainly NaHCO₃ type, followed by CaCl₂ and MgCl₂ type, and has relatively low salinity. The TDS and ion−proportionality coefficients of stratum water are controlled by tectonics. In the structure opening area and the pinch−out area of the strata, the stratum water is characterized by NaHCO₃ type with low TDS, the sodium−chloride coefficient and desulfurization coefficient are high and the metamorphic coefficient is negative. Nevertheless, the stratum water in the closed strata has the opposite hydrochemical feature.
Conclusions
There is a good coupling relation between the hydrochemical characteristics of stratum water and the plane distribution of oil and water, with Dibei oilfield as an example, although the strata north of the Yiqikelike fault had been charged, the generated oil and gas had escaped along the fault. The low TDS, high sodium−chloride coefficient, high desulfurization coefficient, low metamorphic coefficient, and high kaolinite content indicate that the strata were affected by the meteoric water that entered along the fault. On the contrary, the hydrochemical characteristics and kaolinite content in the strata south of the fault reflect that the formation was well sealed and less affected by meteoric water, which corresponds to the distribution of gas layers. The connection between the hydrochemical characteristics and the distribution of reservoirs provides a basis for subsequent exploration, development and evaluation of tight oil and gas reservoirs.
- stratum water,
- ionic ratio coefficients,
- oil−water distribution,
- oil and gas exploration engineering,
- eastern Kuqa Depression,
- Tarim Basin,
- Xinjiang
Highlights
A comprehensive examination of the hydrochemical characteristics and response of the Jurassic Ahe Formation reservoirs in Eastern Kuqa Depression; The relationship between stratum water and the process of hydrocarbon generation is further illustrated in relation to the quantity of kaolinite present.

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References (52)

References

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