Controlling effect of slope break zone on sedimentary systems in the slope area of foreland basin: A case study of the 4th Member of Xujiahe Formation in central Sichuan basin

被引：0

作者：

Hou, Gangfu ^{[1
]}

Liu, Zhanguo ^{[1
]}

Wang, Xiaojuan ^{[2
]}

Chen, Xingyu ^{[1
]}

Zheng, Chao ^{[2
]}

Yuan, Chun ^{[2
]}

Song, Bing ^{[1
]}

Wu, Jin ^{[1
]}

Wang, Bo ^{[1
]}

Dong, Yuyang ^{[1
]}

Liu, Shaozhi ^{[1
]}

Wang, Shaoyi ^{[1
]}

机构：

[1] Petrochina Hangzhou Research Institute of Geology, Zhejiang, Hangzhou

[2] Research Institute of Exploration and Development, Southwest Oil and Gasfield Company, PetroChina, Sichuan, Chengdu

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2024年 / 98卷 / 10期

关键词：

foreland basin; lithological traps; sand bar; Sichuan basin; slope break zone; tight gas; Xujiahe Formation;

D O I：

10.19762/j.cnki.dizhixuebao.2023505

中图分类号：

学科分类号：

摘要：

To clarify the control effect of slope break zones on sedimentary systems in the foreland basin slope area and determine the distribution pattern of these systems, the fourth member of the Xujiahe Formation in the central Sichuan basin was used as a case study. Ancient landforms were reconstructed using the impression method, and slope break zones were identified. Subsequently, core observation, logging facies analysis, and seismic facies analysis were carried out todelineate sedimentary microfacies in the foreland slope area. By integrating sedimentary microfacies and reconstructed ancient landforms,this research proposes that large-scale slope break zones exert significant control over the distribution of sedimentary systems and associated sand bodymicrofacies. Results indicate that the sedimentary period of the fourth member of the Xujiahe Formation in the central Sichuan basin was characterized by a foreland slope setting, marked by the presence of large slope break zones. In this background, a far-source braided river delta sedimentary system developed, mainly composed of braided river delta front subfacies. Further differentiation reveals distinct inner and outer delta front belts,encompassing four sedimentary microfacies, including mouth bars, underwater distributary channels, interdistributary bays, and sheet sand. Above the slope break zone, underwater distributary channel microfacies are prevalent in the inner delta front zone. Conversely, below the slope break zone, composite sand bodies composed of underwater distributary channels and river mouth bars dominate the outer delta front zone. The Hekou dam, situated below the slope break zone, exhibits favorable lateral shielding conditions and superior roof and floor conditions, which are conducive to the formation of lithologic traps. Its proximity to hydrocarbon source rocks in the western Sichuan depression renders it a highly prospective target for future exploration endeavors. © 2024 Geological Society of China. All rights reserved.

引用

页码：3106 / 3116

页数：10

共 20 条

[11]

Vail P R, Mitchum R M, Thompson S, Et al., Seismic stratigraphy and global changes of sea level, Seismic Stratigraphy Application of Hydrocarbon Exploration. AAPG Memoir, 26, pp. 49-212, (1977)

[12]

Wang Yingmin, Liu Hao, Li Licheng, Qi Xuefeng, Wang Yuan, Types and distribution characteristics of slope breaks of large-type down-warped lake basins, Earth Science, 27, 6, pp. 683-688, (2002)

[13]

Wei Guoqi, Yang Wei, Liu Mancang, Xie Wuren, Hui Jin, Saijun Wu, Su Nan, Shen Juehong, Hao Cuiguo, Distribution rules, main controlling factors and exploration directions of giant gas fields in the Sichuan basin, Natural Gas Industry, 39, 6, pp. 1-12, (2019)

[14]

Wei Kuisheng, Xu Huaida, Ye Shufen, Guo Zhanqian, Xu Hong, Ren Yanguang, Wang Yuhua, High resolution sequence stritigraphic framework in Cretaceous, Songliao basin, Oil & Gas Geology, 18, 1, pp. 7-14, (1997)

[15]

Xin Quanlin, Zerong Liu, Xiaomin Zhu, Zheng Qin, Xu Piqin, Lin Zhongyue, A study on tectonic-lithofacies belt and oil-gas accumulation in the western Huimin depression, Journal of the University of Petroleum, China, 12, 3, pp. 1-4, (1988)

[16]

Changgui Xu, Paleogeomorphy analysis for the Paleogene reservoir prediction in Bohai Sea area, Petroleum Exploration and Development, 31, 5, pp. 283-285, (2004)

[17]

Xikun Xu, Haixi paleogeomorphology on Hetian palaeohigh, Special Oil and Gas Reservoirs, 10, 3, pp. 142-148, (2003)

[18]

Wenzhi Zhao, Congshen Bian, Chunchun Xu, Hongjun Wang, Tongshan Wang, Zhengsheng Shi, Assessment on gas accumulation potential and favorable plays within the Xu-1, 3 and 5 members of Xujiahe Formation in Sichuan basin, Petroleum Exploration and Development, 38, 4, pp. 385-393, (2011)

[19]

Zhao Yuguang, Qiu Dongzhou, Zhang Jiqing, Sequence stratigraphy of the late foreland basin (T-J) in the west Junggar boundary mountains and petroleum exploration, Xinjiang Petroleum Geology, 14, 4, pp. 323-331, (1993)

[20]

Yun Zou, Tectonic evolution and fracture stage in Hexingchang, Dongtai and Luojiang area of the Western Sichuan depression, (2010)

← 1 2 →