Development characteristics of coal-measure source rocks divided on the basis of Milankovich coal accumulation cycle in Pinghu Formation,Xihu sag

被引：0

作者：

Shen Y. ^{[1
,2
]}

Qin Y. ^{[1
,2
]}

Guo Y. ^{[1
,2
]}

Zhao Z. ^{[3
]}

Yuan X. ^{[4
]}

Qu Z. ^{[1
,2
]}

Xie G. ^{[5
]}

机构：

[1] Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process, the Ministry of Education, China University of Mining and Technology, Xuzhou, 221116, Jiangsu

[2] School of Resource and Geoscience, China University of Mining and Technology, Xuzhou, 221116, Jiangsu

[3] CNOOC Research Institute, Beijing

[4] College of Mining Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning

[5] No. 223 Geological Prospecting Team of Jiangxi Coal Geological Bureau, Yingtan, 335000, Jiangxi

来源：

Shen, Yulin (yulinsh@163.com) | 1600年 / Science Press卷 / 37期

关键词：

Coal accumulation; Milankovich cycle; Pinghu Formation; Sedimentary environment; Transgression; Xihu sag;

D O I：

10.7623/syxb201606002

中图分类号：

学科分类号：

摘要：

Based on the comprehensive analysis of well logging, core observation, seismic profile and geochemical analysis test results, as well as wavelet analysis, this study performs the sequence stratigraphic division of Pinghu Formation using Milankovitch cycles, explore the development laws of coal-measure source rocks in Pinghu Formation, summarizethe controlling factors for the development of coal-measure source rocks and create the coal accumulation model of Pinghu Formation, Xihu sag. The results show that Pinghu Formation isdivided into three long-period cycles (approximately equivalent to the member of Pinghu Formation), and further divided into 12 mid-period cycles and 48 short-period cycles. Thus, Pinghu Formation is divided into 12 coal accumulation cycles and 48 coal groups. The development of coal accumulation cycle is controlled by the parameters related to Milankovitch cycle. The right inflection point of Milankovitch cycle indicates the ideal period with relatively warm and wet climatefor coal accumulation, which can be traced for correlation in the sag.The development of coal-measure source rockssuch as coal beds is strictly controlled by the distribution of sedimentary faciesbelt. It is pointed out that the intensive activities of syndepositional faults are the main reason for thin thickness and multiple layers of coal seam in Pinghu Formation. The period with relative sea-level rising is supposed to be the critical period for coal seam accumulation. The migration of coal accumulation center is controlled by facies belt evolution. Abandoned deltaisthe most favorable place for the accumulation of coal seams. © 2016, Editorial Office of ACTA PETROLEI SINICA. All right reserved.

引用

页码：706 / 714

页数：8

共 30 条

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