Identification methods of coal-bearing source rocks for Yacheng Formation in the western deepwater area of South China Sea

REN Jinfeng; ZHANG Yingzhao; WANG Hua; WANG Yahui; GAN Huajun; HE Weijun; SUN Ming; SONG Guangzeng

doi:10.1007/s13131-015-0647-2

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Article Navigation > Acta Oceanologica Sinica > 2015 > 34(4): 19-31

REN Jinfeng, ZHANG Yingzhao, WANG Hua, WANG Yahui, GAN Huajun, HE Weijun, SUN Ming, SONG Guangzeng. Identification methods of coal-bearing source rocks for Yacheng Formation in the western deepwater area of South China Sea[J]. Acta Oceanologica Sinica, 2015, 34(4): 19-31. doi: 10.1007/s13131-015-0647-2

Citation:

REN Jinfeng, ZHANG Yingzhao, WANG Hua, WANG Yahui, GAN Huajun, HE Weijun, SUN Ming, SONG Guangzeng. Identification methods of coal-bearing source rocks for Yacheng Formation in the western deepwater area of South China Sea[J]. Acta Oceanologica Sinica, 2015, 34(4): 19-31. doi: 10.1007/s13131-015-0647-2

Citation:

REN Jinfeng, ZHANG Yingzhao, WANG Hua, WANG Yahui, GAN Huajun, HE Weijun, SUN Ming, SONG Guangzeng. Identification methods of coal-bearing source rocks for Yacheng Formation in the western deepwater area of South China Sea[J]. Acta Oceanologica Sinica, 2015, 34(4): 19-31. doi: 10.1007/s13131-015-0647-2

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Identification methods of coal-bearing source rocks for Yacheng Formation in the western deepwater area of South China Sea

doi: 10.1007/s13131-015-0647-2

1.
Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China;Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang 524057, China
3.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
4.
Guangzhou Marine Geological Survey, Guangzhou 510075, China

Received Date: 2014-06-21
Rev Recd Date: 2014-09-28

Abstract

Abstract

Owing to the fact that the coal-beds are with the characteristics of multi-beds, thin single-bed, rapid lateral changes and deep burial, coal-bearing source rocks are difficult to be identified and predicted, especially in the lower exploration deepwater area. In this paper, a new integrative process utilizing geology and geophysics is proposed for better predicting the distribution of coal-bearing source rocks. Coal-beds were identified by the logging responses of “three higher, three lower, and one expand” and carbargilite were recognized by the characteristics of “four higher and one lower”. Based on the above logical decision, coal-beds and carbargilite can be distinguished automatically by cluster analysis of logging curves in verticality. Within the constraints of wellseismic calibration, the coal-beds group also can be detected in horizontality by the integrated representation of “negative phase, higher Q, lower impedance and lower frequency” within the seismic data. However, the distribution of coal-bearing source rocks utilizing geophysical methodology may do not conform to the geological rules of coal accumulation. And then the main geological controlling factors of coal accumulation are comprehensively analyzed as follows: (1) Paleotopography and tectonic subsidence determine the planar range of terrestrial-marine transitional facies markedly; (2) The relative sea level changes affect the accommodation space and shoreline migration, and limit the vertical range of coal-beds. More specifically, the relationship between the accommodation creation rate and the peat accumulation rate is a fundamental control on coal accumulation. The thickest and most widespread coals form where those two factors reached a state of balance; (3) The supply of autochthonous clasts and the distance between deposition places and paleovegetation accumulated area are the critical factor to form abundant coal, which means that if deposition area is close to paleouplift, there would be sufficient organic matters to form abundant source rocks. The results show that the integrated methods can significantly improve prediction accuracy of coal-bearing source rocks, which is suitable for early exploration of western deepwater area of South China Sea.
- Qiongdongnan Basin,
- deepwater area,
- coal-bearing source rocks,
- geological and geophysical methods

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References(34)

References

Aitken J F. 1994. Coal in a sequence stratigraphic framework. Geoscientist, 4(5): 9-12

Bohacs K, Suter J. 1997. Sequence stratigraphic distribution of coaly rocks: Fundamental controls and paralic examples. AAPG Bulletin, 81(10): 1612-1639

Cai Jia. 2008. Paleo-morphologic Restoration of Paleogene in Qiongdongnan basin and its control on sequence architecture and sedimentary characteristic [dissertation]. Wuhan: China University of Geosciences, 36-80

Diessel C F K. 2007. Utility of coal petrology for sequence-stratigraphic analysis. International Journal of Coal Geology, 70(1-3): 3-34

Dong Weiliang, Huang Baojia. 2000. Identification marks and source discrimination of the coal-type gas in YGH and QDN basins of South China Sea. Natural Gas Industry (in Chinese), 20(1): 23-27

Deng Yunhua. 2009. Analysis on differences of petroleum type and geological conditions between two depression belts in China offshore. Acta Petrol ei Sinca, 30(1): 1-8

Gong Zaisheng, Li Sitian. 1997. Continental Margin Basin Analysis and Hydrocarbon Accumulation of the Northern South China Sea (in Chinese). Beijing: Science Press, 1: 20-100

Holz M, Kalkreuth W, Banerjee I. 2002. Sequence stratigraphy of paralic coal-bearing strata: an overview. International Journal of Coal Geology, 48(3-4): 147-179

Huang Zhihui. 1987. Analytical method lecture of logging coal-bearing strata: lecture three, analytical method of logging lithological characters. Coal Geology & Exploration (in Chinese), 15(3): 62-66

Huang Baojia, Li Xushen, Wang Zhenfeng, et al. 2012. Source rock geochemistry and gas potential in the deep water area, Qiongdongnan basin. China Offshore Oil and Gas (in Chinese), 24(4): 1-7

Huang Baojia, Xiao Xianming, Li Xuxuan. 2003. Geochemistry and origins of natural gases in the Yinggehai and Qiongdongnan basins, offshore South China Sea. Organic Geochemistry, 34(7): 1009-1025

Li Youchuan, Deng Yunhua, Zhang Gongcheng, et al. 2011a. Tertiary marine source rocks in the northern South China Sea. Acta Petrolei Sinica (in Chinese), 32(2): 219-225

Li Youchuan, Fu Ning, Zhang Zhihuan. 2013. Hydrocarbon source conditions and origins in the deepwater area in the northern South China Sea. Acta Petrolei Sinica (in Chinese), 34(2): 247-254

Li Zengxue, He Yuping, Liu Haiyan, et al. 2010. Sedimentology characteristics and coal-forming models in Yacheng Formation of Qiongdongnan Basin. Acta Petrolei Sinica (in Chinese), 31(4): 542-547

Li Zengxue, Lv Dawei, Zhang Gongcheng, et al. 2011b. Identification methods of coal-bearing strata and coal group of Paleogene in sea area. Journal of China Coal Society (in Chinese), 36(7): 1102-1109

Li Wenhao, Zhang Zhihuan, Li Youchuan, et al. 2011c. Geochemical characteristics and hydrocarbon generation of paleogene oligocene source rocks in Qiongdongnan basin. Natural Gas Geoscience (in Chinese), 22(4): 700-708

Li Zengxue, Zhang Gongcheng, Li Youchuan, et al. 2012. The Paleogene coal-bearing basin and coal-measures distribution of China sea area. Earth Science Frontiers (in Chinese), 18(4): 314-326

Meng Zhaoping, Guo Yansheng, Pan Jienan, et al. 2006. Prediction model for coal bed thickness based on seismic attribute and its application. Journal of Geophysics (in Chinese), 49(2): 23-26

Mi Lijun, Wang Dongdong, Li Zengxue, et al. 2010. High-resolution sequence stratigraphic framework and coal-forming features in Yacheng Formation of Qiongdongnan Basin. Acta Petrolei Sinica (in Chinese), 31(4): 534-541

Shao Longyi, Lu Jing, Wang Hao, et al. 2009. Developments of coal measures sequence stratigraphy in China. Acta Sedimentologica Sinica (in Chinese), 27(5): 904-914

Shen Huailei, Qin Changwen, Wang Dongdong, et al. 2010. Distinguishing methods for coal beds in Yacheng Formation of Qiongdongnan Basin. Acta Petrolei Sinica (in Chinese), 31(4): 586-590

Su Ming, Xie Xinong, Xie Yuhong, et al. 2013. The segmentations and the significances of the central canyon system in the Qiongdongnan basin, northern South China Sea. Journal of Asian Earth Sciences, 79(Part A): 552-563

Wang Zhenfeng, Li Xushen, Sun Zhipeng, et al. 2011. Hydrocarbon accumulation conditions and exploration potential in the deepwater region, Qiongdongnan basin. China Offshore Oil and Gas (in Chinese), 23(1): 7-13

Wu Yukun, Hu Mingyi, Ke Ling, et al. 2013. Identification of highquality source rocks by seismic facies: Taking the third member of Shahejie formation in Liaozhong depression as an example. Acta Sedimentologica Sinica (in Chinese), 31(2): 366-373

Xie Jinyou, Zhu Youhua, Li Xushen, et al. 2012. He Cenozoic sea-level changes in Yinggehai-Qiongdongnan basin, northern South China Sea. Marine Origin Petroleum Geology (in Chinese), 17(1): 49-58

Yegireddi S, Bhaskar G U. 2009. Identification of coal seam strata from geophysical logs of borehole using Adaptive Neuro-Fuzzy Inference System. Journal of Applied Geophysics, 67(1): 9-13

Yuan Yusun, Yang Shuchun, Hu Shenbiao, et al. 2008. Tectonic subsidence of Qiongdongnan basin and its main control factors. Chinese Journal of Geophysics, 51(2): 248-255

Zhang Shuichang, Gao Zhiyong, Li Jianjun, et al. 2012. Identification and distribution of marine hydrocarbon source rocks in the Ordovician and Cambrian of the Tarim Basin. Petroleum Explora-tion and Development (in Chinese), 39(3): 285-294

Zhang Gongcheng, Liang Jianshe, Xu Jianyong, et al. 2013a. An evaluation method of potential hydrocarbon-rich sags and their source rock identification offshore China. China Offshore Oil and Gas (in Chinese), 25(1): 13-19

Zhang Gongcheng, Deng Yunhua, Wu Jingfu, et al. 2013b. Coal measure source-rock characteristics and gas exploration directions in Cenozoic superimposed faulted depressions, offshore China. China Offshore Oil and Gas (in Chinese), 25(6): 15-25

Zhang Gongcheng, Mi Lijun, Wu Shiguo, et al. 2007. Deepwater areathe new prospecting targets of northern continental margin of South China Sea. Acta Petrolei Sinica (in Chinese), 28(2): 15-21

Zhang Jinwei, Zhao Zhigang, Liang Jianshe. 2011. An integrated study on coal measure distribution in x sag based on seismic and geologic data. Natural Gas Geoscience (in Chinese), 20(1): 157-163

Zhao Weiyong, Liu Wenlong, Men Guangtian, et al. 2007. Prediction method for distribution area and thickness of hydrocarbon source rocks—taking Xujiaweizi depression in Songliao basin as an example. Acta Petrolei Sinica (in Chinese), 28(5): 67-71

Zhu Weilin, Zhong Kai, Li Youchuan, et al. 2012. Characteristics of hydrocarbon accumulation and exploration potential of the northern South China Sea deepwater basins. Chinese Science Bulletin, 57(20): 3121-3129

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