Characteristics of late reformation and petroleum prospect of Carboniferous strata in the Bayanhot Basin, N. China,Geological Journal

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Characteristics of late reformation and petroleum prospect of Carboniferous strata in the Bayanhot Basin, N. China
Geological Journal ( IF 1.4 ) Pub Date : 2022-07-17 , DOI: 10.1002/gj.4537
Hongge Zhao ₁ , Chiyang Liu ₁ , Yijun Zhou ₂ , Xiaozhou Shao _{3,

4} , Jianqiang Wang ₁ , Zhichao Peng ₁ , Lei Huang ₁ , Zhengzhong Ruan ₂ , Hui Guo ₁ , Xinhui Fu ₁ , Ya'nan Li ₁

Affiliation

The Bayanhot Basin is located at the intersection of the Alxa Block, Ordos Basin, and Corridor Transitional Zone. Although the Carboniferous palaeo-sedimentary and tectonic features are of great significance in discovering the scientific issues of the influential range of the Qinlin-Qilian Ocean and palaeo-Asian Ocean and the relationship of the North China Block and Alxa Block, as well as in evaluating hydrocarbon prospects, it is difficult to restore the Carboniferous features because of intense late reformation. It is necessary to systematically discuss the late reformation characteristics. It is shown in this paper that Carboniferous strata have mainly experienced two extensive tectonic movements during the Late Hercynian–Indosinian and Yanshanian periods and had four reformation types: structural compression, uplift to erosion, superimposed and deep burial, and thermodynamic reformation, based on comprehensive analysis of seismic profiles, wells, aeromagnetic data and tectonic characteristics of the surrounding regions. Carboniferous strata were partly eroded by the compressional folding during Late Hercynian–Indosinian movement, and were forcefully eroded by thrusting and uplift during Yanshanian movement, especially movement in the Late Jurassic, which determined the present thickness of the Carboniferous strata. The deep overlap of the overlying Jurassic, Lower Cretaceous, Palaeogene, and Neogene rocks in different areas was beneficial to the maturation of Carboniferous source rocks. The magmatic rocks exposed by well drilling and shallow aeromagnetic anomaly belts show heating reformation, which accelerated the maturation of source rocks to some extent. The total strength of the Carboniferous late reformation was stronger in the western area than in the eastern area and greater in the northern area than in the southern area. The multiple periods and various types of reformation were closely related to the regional closure of the Palaeo-Qinling-Qilian Ocean in the south, Palaeo-Asian Ocean, and Mongolia–Okhotsk Ocean in the north and the subduction of the Palaeo-Pacific Plate in the east. The Carboniferous strata in eastern and southern basins will be the prospective favourable areas for the petroleum exploration.

中文翻译：

巴彦浩特盆地石炭系晚期改造特征及油气前景

巴彦浩特盆地位于阿拉善地块、鄂尔多斯盆地和走廊过渡带的交汇处。尽管石炭纪古沉积构造特征对于发现秦祁洋和古亚洲洋影响范围、华北陆块与阿拉善陆块关系的科学问题以及评价油气远景，由于后期改造强烈，石炭系特征难以恢复。有必要系统地讨论改革后期的特点。研究表明，石炭系地层在晚海西—印支期和燕山期主要经历了两次大范围的构造运动，具有构造挤压、抬升到侵蚀、抬升到侵蚀四种改造类型。在综合分析地震剖面、井、航磁资料及周边地区构造特征的基础上，进行叠加深埋、热力改造。石炭系地层在晚海西—印支运动中受到挤压褶皱的部分侵蚀，在燕山运动特别是晚侏罗世运动中受到逆冲和隆起的强烈侵蚀，决定了石炭系现今的地层厚度。不同地区上覆侏罗系、下白垩统、古近系、新近系岩石深度重叠，有利于石炭系烃源岩的成熟。钻井出露的岩浆岩和浅层航磁异常带出现加热改造，在一定程度上加速了烃源岩的成熟。石炭纪晚期改造总强度西部强于东部，北部强于南部。多期、多类型的改造与南部古秦岭-祁连洋、北部古亚洲洋、蒙古-鄂霍次克洋的区域闭合和古太平洋板块俯冲密切相关。东部。盆地东部和南部石炭系将是远景油气勘探有利区。多期、多类型的改造与南部古秦岭-祁连洋、北部古亚洲洋、蒙古-鄂霍次克洋的区域闭合和古太平洋板块俯冲密切相关。东部。盆地东部和南部石炭系将是远景油气勘探有利区。多期、多类型的改造与南部古秦岭-祁连洋、北部古亚洲洋、蒙古-鄂霍次克洋的区域闭合和古太平洋板块俯冲密切相关。东部。盆地东部和南部石炭系将是远景油气勘探有利区。

更新日期：2022-07-17

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