Mechanism and potential of high-yield oil and gas production in the ultra-deep tight clastic reservoirs in the southern margin of Junggar Basin

被引：0

作者：

Yujiang, Shi ^{[1
,6
]}

Renzhong, Gan ^{[2
]}

Jingqi, Lin ^{[3
,4
]}

Zhifeng, Cao ^{[3
]}

Xianhu, Wang ^{[3
]}

Hao, Zhang ^{[2
]}

Kai, Zhang ^{[3
]}

Long, Yuan ^{[5
]}

Jufeng, Zhou ^{[3
]}

Qingqing, Duan ^{[3
]}

Hongyi, Zhao ^{[3
]}

Rui, Xu ^{[3
]}

机构：

[1] CNPC Logging Co., Ltd.

[2] Exploration Department, PetroChina Xinjiang Oilfield Company

[3] Xinjiang Branch of CNPC Logging Co., Ltd

[4] College of Geosciences, China University of Petroleum, Beijing

[5] Research Institute of Geology, CNPC Logging Co., Ltd

[6] CNPC Logging Co., Ltd., No.50, Zhangba Road, Jinye Second Road, High-tech Development Zone, Shaanxi Province, Xi’an City

来源：

China Petroleum Exploration | 2025年 / 30卷 / 01期

关键词：

formation overpressure; Lower Cretaceous Qingshuihe Formation; mechanism of high-yield production; pore structure; southern margin of Junggar Basin; tight clastic rock; ultra-deep formation;

D O I：

10.3969/j.issn.1672-7703.2025.01.007

中图分类号：

学科分类号：

摘要：

In the thrust belt of the southern margin of Junggar Basin, the high-yield oil and gas production has successively been obtained in the deep to ultra-deep tight clastic reservoirs in the lower combination, with effective reservoirs and production capacity closely related to formation overpressure intensity. In order to clarify the mechanism of formation overpressure on high-quality reservoir and production capacity, the influence of formation overpressure on reservoir pore structure, permeability, oil and gas saturation, reservoir permeability, and production pressure difference is studied by integrating with previous studies and using geological, logging, drilling, well testing and petrophysical experimental data. In addition, the petrophysical experiments are conducted with the simulated dynamic pore pressure in reservoir formation conditions. The study results show that the highly–extremely over-pressured strata were widely developed in the study area, with intergranular pores retained, overpressure fractures developed, and reservoir “storage pores” and “connection pores” interconnected with each other, forming a high-quality reservoir with double porosity structure of matrix pores and fractures, which was conducive to the formation of high oil and gas saturation. The pore structure of the reservoir was controlled by lithology and overpressure intensity. Formation overpressure had little influence on the absolute reservoir porosity, but had great influence on permeability. When the pore pressure reached a critical value, the permeability increased abnormally, which was conducive to fracture initiation, enhancement of fluid flow capacity, and formation of high-yield oil and gas layers. Therefore, the formation overpressure showed mechanism of “retaining pores, increasing permeability and enhancing saturation”, and the overpressure intensity was the key factor for forming high-quality reservoir and achieving high-yield oil and gas production, as well as the basis for realizing high-yield and steady oil and gas production. The study results indicate that the favorable exploration area of deep to ultra-deep reservoirs in the southern margin of Junggar Basin is the effective traps with formation pressure coefficient of higher than 2.0. © 2025 Petroleum Industry Press. All rights reserved.

引用

共 42 条

[1]

Chengzao Jia, Xiongqi Pang, Research processes and main development directions of deep hydrocarbon geological theories[J], Acta Petrolei Sinica, 36, 12, pp. 1457-1469, (2015)

[2]

Yang Li, Zhaojie Xue, Zhe Cheng, Et al., Progress and development directions of deep oil and gas exploration and development in China[J], China Petroleum Exploration, 25, 1, pp. 45-57, (2020)

[3]

Cao Yingchang, Yuan Guanghui, Yang Hai, Et al., Current status of oil and gas exploration and research progress of the origin of high-quality reservoirs in deep-ultra-deep clastic reservoirs of petroliferous basins, Acta Petrolei Sinica, 43, 1, pp. 112-140, (2022)

[4]

Xiaojing Wang, Baojun Bai, Hui Lu, Et al., Characteristics and main controlling factors of deep and ultra-deep glutenite reservoirs with high temperature and very strong overpressure:a case study from the Cretaceous Qingshuihe Formation in Gaoquan Area, Sikeshu Sag, southern margin of Junggar Basin [J], Journal of Northeast Petroleum University, 46, 3, pp. 54-65, (2022)

[5]

Jiang Da, Yan Song, Shaobo Liu, Et al., Hydrocarbon play and controlling factors in fold-thrust belt of the southern Junggar foreland basin[J], Petroleum Geology & Experiment, 29, 4, pp. 355-360, (2007)

[6]

Tao Song, Min Zheng, Fuxi Huang, Et al., Exploration progress and potential of oil and gas in deep-ultradeep clastic rocks of PetroChina[J], Marine Origin Petroleum Geology, 29, 3, pp. 225-235, (2024)

[7]

Zhichao Pang, Dongsheng Ji, Min Liu, Et al., JurassicCretaceous oil-gas accumulation conditions and exploration potential in the thrust belt and the southern margin of Junggar Basin[J], Acta Petrolei Sinica, 44, 8, pp. 1258-1273, (2019)

[8]

Fengqi Zhang, Xuesong Lu, Qingong Zhuo, Et al., Genetic mechanism and evolution characteristics of overpressure in the lower play at the southern margin of the Junggar Basin， northwestern China[J], Oil ＆ Gas Geology, 41, 5, (2020)

[9]

Xuesong Lu, Mengjun Zhao, Zhang Fengqi, Et al., Characteristics, origin and controlling effects on hydrocarbon accumulation of overpressure in foreland southern marginal thrust belt of Junggar Basin, NW China[J], Petroleum Exploration and Development, 49, 5, pp. 859-870, (2002)

[10]

Jinduo Wang, Guanlong Zhang, Xinming Zhuang, Et al., Research progress and potential directions of oil and gas exploration in key fields of Junggar Basin[J], Petroleum Geology and Recovery Efficiency, 31, 4, pp. 24-41, (2024)

← 1 2 3 4 5 →