Quantitative Evaluation for Coal-bearing Source Rocks of Yacheng Formation in the Deepwater Area of the Qiongdongnan Basin

XIONG Bo，SU Long，ZHANG Gong-cheng，SHEN Huai-lei，ZHENG Jian-jing

doi:10.11764/j.issn.1672-1926.2014.04.542

2014 , Vol. 25 >Issue 4: 542 - 550

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.04.542

Quantitative Evaluation for Coal-bearing Source Rocks of Yacheng Formation in the Deepwater Area of the Qiongdongnan Basin

Expand

1.Institute of Porous Flow and Fluid Mechanics,University of Chinese Academy of Sciences,Langfang 065007,China;
2.Langfang Branch of Research Institute of Petroleum Exploration and Development,Langfang 065007,China;
3.The Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,
Lanzhou 730000,China;4.CNOOC Research Center,Beijing 100027,China

Received date: 2013-10-24

Revised date: 2013-01-25

Online published: 2014-04-10

Fold

Abstract

Oil and gas exploration of the Qiongdongnan Basin in South China Sea have revealed that source rocks in Lower Oligocene Yacheng Formation in the deepwater area,as one of the main gas source rocks,are coal-bearing source rocks of transitional facies.Based on the controlling factors for medium-sized gas fields in deepwater basin,we carried out the whole rock pyrolysis for coal-bearing source rocks of Yacheng Formation,and conducted study on quantitative evaluation for both the upper limit of maturity for gas generation (ULMGG) or “the deadline of gas generation” and quantitative dynamic model.Linked to geological background,we tested the thermal evolution of coal-bearing source rocks under different conditions and natural gas generation.The results show that the upper limit of maturity for gas generation of the whole rock is equal to 4.38% for vitrinite reflectance (VR),where the gas generation rates change little with the increase of maturation,the ΔR_O-value is 0.83% of the maximum related to VR of 4.38%Ro,and the process of gas generation from source rock nearly ends while Ro is over 4.38%.At the same time,we obtained the quantitative dynamic model for coal-bearing source rocks of Yacheng Formation under different evolution stages.By comparing to both the conclusions of pyrolysis experiments and the data of VR from the source rock of Yacheng Formation on a series of selected 8 wells in the shallow-water continental shelf basins,it indicates that the most source rocks are still far from reaching ULMGG of the whole rock for type Ⅱ kerogen.The coal-bearing source rocks of Yacheng Formation in the local areas of the deepwater basin still have preferable natural gas generation potential,especially in the areas along the central depression belt from the depocenter to both the margin and its adjacent areas.It has both theoretical and practical significance to oil and gas exploration and development in the other basins with low exploration degree in the northern South China Sea.

Key words： Qiongdongnan Basin; Coal-bearing source rocks; The upper limit of maturity for gas generation; Kinetics

Cite this article

XIONG Bo，SU Long，ZHANG Gong-cheng，SHEN Huai-lei，ZHENG Jian-jing . Quantitative Evaluation for Coal-bearing Source Rocks of Yacheng Formation in the Deepwater Area of the Qiongdongnan Basin[J]. Natural Gas Geoscience, 2014 , 25(4) : 542 -550 . DOI: 10.11764/j.issn.1672-1926.2014.04.542

References

［1］Dai Jinxing,Hu Guoyi,Ni Yunyan,et al.Natural gas distribution feature in the east of China［J］.Natural Gas Geosicence,2009,20(4):471-487.［戴金星,胡国艺,倪云燕,等.中国东部天然气分布特征［J］.天然气地球科学,2009,20(4):471-487.］

［2］Huang Baojia,Li Xushen,Wang Zhenfeng,et al.Source rock geochemistry and gas potential in the deep water area,Qiongdongnan Basin［J］.China Offshore Oil and Gas,2012,24(4):1-7.［黄保家,李绪深,王振峰，等.琼东南盆地深水区烃源岩地球化学特征与天然气潜力［J］.中国海上油气,2012,24(4):1-7.］

［3］Zhang Yina,Zhang Gongcheng,He Yuping,et al.Sedimentation and source rock characteristics of Yacheng Formation in Beijiao Sag of Qiongdongnan Basin［J］.Natural Gas Geoscience,2013,24(4):725-732.［张义娜,张功成,何玉平,等.琼东南盆地北礁凹陷崖城组沉积与烃源岩发育特征［J］.天然气地球科学,2013,24(4):725-732.］

［4］Wu Yukun,Hu Mingyi,Liu Zhifeng,et al.The sedimentary facies and coal measures source rock distribution of Yacheng Formation in Yabei Sag,Qiongdongnan Basin［J］.Natural Gas Geoscience,2013,24(3):582-590.［吴玉坤,胡明毅,刘志峰,等.琼东南盆地崖北凹陷崖城组沉积相及煤系烃源岩分布［J］.天然气地球科学,2013,24(3):582-590.］

［5］Li Zengxue,He Yuping,Liu Haiyan,et al.Sedimentology characteristics and coal-forming models in Yacheng Formation of Qiongdongnan Basin［J］.Acta Petrolei Sinica,2010,31(4):542-547.［李增学,何玉平,刘海燕,等.琼东南盆地崖城组煤的沉积学特征与聚煤模式［J］.石油学报,2010,31(4):542-547.］

［6］Zhang Gongcheng,He Yuping,Shen Huailei.Distribution of Yachen Formation coal measure in Yabei Sag in Qiongdongnan Basin［J］.Natural Gas Geoscience,2012,23(4):654-661.［张功成,何玉平,沈怀磊.琼东南盆地崖北凹陷崖城组煤系烃源岩分布及其意义［J］.天然气地球科学,2012,23(4):654-661.］

［7］Zhang Gongcheng,Mi Lijun,Wu Shiguo,et al.Deepwater area-the new prospecting targets of northern continental margin of South China Sea［J］.Acta Petrolei Sinica,2007,28(2):15-21.［张功成,米立军,吴时国,等.深水区——南海北部大陆边缘盆地油气勘探新领域［J］.石油学报,2007,28(2):15-21.］

［8］Zhang Gongcheng,Mi Lijun,Wu Jingfu,et al.Rises and their plunges:Favorable exploration direction for major fields in the deepwater area,Qiongdongnan Basin［J］.China Offshore Oil and Gas,2010,22(6):360-368.[张功成,米立军,吴景富,等.凸起及其倾没端——琼东南盆地深水区大中型油气田有利勘探方向［J］.中国海上油气,2010,22(6):360-368.］

［9］Zhu Weilin,Zhang Gongcheng,Yang Shaokun,et al.Natural Gas Geology of Northern Continental Margin of South China Sea［M］.Beijing:Petroleum Industrial Press,2007.［朱伟林,张功成,杨少坤,等.南海北部大陆边缘盆地天然气地质［M］.北京:石油工业出版社,2007.］

［10］Mi Lijun,Yuan Yusong,Zhang Gongcheng,et al.Characteristics and genesis of geothermal field in deep-water area of the northern South China Sea［J］.Acta Petrolei Sinica,2009,30(1):27-32.［米立军,袁玉松,张功成,等.南海北部深水区地热特征及其成因［J］.石油学报,2009,30(1):27-32.］

［11］Wu Jinfu,Yang Shunchun,Zhang Gongcheng,et al.Geothermal history and thermal evolution of the source rocks in the deep-water area of the northern South China Sea［J］.Chinese Journal of Geophysics,2013,56(1):170-180.［吴景富,杨树春,张功成,等.南海北部深水区盆地热历史及烃源岩热演化研究［J］.地球物理学报,2013,56(1):170-180.］

［12］Lin Changsong,Zhang Yanmei.The simulation analysis for the history of the basin subsidence［M］//Gong Zaisheng,Li Sitian,Xie Taijun,et al.Analysis of Oil and Gas Accumulation in the Continental Margin Basin,North of South Sea,China.Beijing:Science Press,1997:83.［林畅松,张艳梅.盆地沉降史模拟分析［M］//龚再升,李思田,谢泰俊,等.南海北部边缘盆地分析与油气聚集.北京:科学出版社,1997:83.］

［13］Su Long,Zheng Jianjing,Wang Qi,et al.Formation mechanism and research progress on overpressure in the Qiongdongnan Basin［J］.Natural Gas Geoscience,2012,23(4):662-672.［苏龙,郑建京,王琪,等.琼东南盆地超压的研究进展及形成机制［J］.天然气地球科学,2012,23(4):662-672.］

［14］Tissot B P,Welte D H.Petroleum Formation and Occurrence［M］.Berlin,Heidelberg,New York:Springer-Vevlag,1984:1-699.

［15］Su Long,Zheng Jianjing,Chen Guojun,et al.The upper limit of maturity of natural gas generation and its implication for the Yacheng Formation in the Qiongdongnan Basin,China［J］.Journal of Asian Earth Sciences,2012,54/55:203-213.

［16］Ungerer P.State of the art in kinetic modeling of oil formation and expulsion［J］.Organic Geochemistry,1990,16(1):1-25.

［17］Liu Quanyou,Krooss B M,Jin Zhijun,et al.Determination of kinetic parameters in open system non-isothermal pyrolysis with ultra-high temperature for coal and its macerals and geological extrapolation of natural gas［J］.Earth Science Frontiers,2009,16(1):167-172.［刘全有,Krooss B M,金之钧,等.煤及显微组分在超高温开放体系实验中动力学参数确立与天然气形成过程预测［J］.地学前缘,2009,16(1):167-172.］

［18］Behar F,Tang Y,Liu J.Comparison of rate constants for some molecular tracers generated during artificial maturation of kerogens:Influence of kerogen type［J］.Organic Geochemistry,1997,26:281-287.

［19］Pepper A S,Corvi P J.Simple kinetic models of petroleum formation.Part 1:Oil and gas generation from kerogen［J］.Marine and Petroleum Geology,1995,12(3):291-319.

［20］Lu Shuangfang,Wang Min,Wang Yuewen,et al.Comparison of simulation results from the closed and open experimental systems and its significance［J］.Acta Sedimentologica Sinica,2006,24(2):282-288.［卢双舫,王民,王跃文,等.密闭体系与开放体系模拟实验结果的比较研究及其意义［J］.沉积学报,2006,24(2):282-288.］

［21］Guo Min,Zhou Mingwen,Li Rui,et al.Analysis on oil shale forming conditions in Maoming Basin of Guangdong province［J］.Geology and Mineral Resources of South China,2009,(2):47-51.［郭敏,周明文,李瑞,等.广东茂名盆地油页岩成矿因素分析［J］.华南地质与矿产,2009,(2):47-51.］

［22］Zhao Wenzhi,Wang Zhaoyun,Zhang Shuichang,et al.Successive generation of natural gas from organic materials and its significance in future exploration［J］.Petroleum Exploration and Development,2005,32(2):1-7.［赵文智,王兆云,张水昌,等.有机质“接力成气”模式的提出及其在勘探中的意义［J］.石油勘探与开发,2005,32(2):1-7.］

［23］Hu Guoyi,Li Zhisheng,Luo Xia,et al.The comparison of gas generation potential and model between two different thermal simulation systems［J］.Acta Sedimentologica Sinica,2004,22(4):718-728.［胡国艺,李志生,罗霞,等.两种热模拟体系下有机质生气特征对比［J］.沉积学报,2004,22(4):718-728.］

［24］Wang Yunpeng,Zhao Changyi,Wang Zhaoyun,et al.Kinetic method for determining the main gas generation period of marine organic matters and its application［J］.Petroleum Exploration and Development,2005,32(4):153-158.［王云鹏,赵长毅,王兆云,等.利用生烃动力学方法确定海相有机质的主生气期及其初步应用［J］.石油勘探与开发,2005,32(4):153-158.］［25］Liu Jinzhong,Tang Yongchun.Predict methane generation with kerogen kinetic method of one case［J］.Chinese Science Bulletin,1998,43(11):1187-1191.［刘金钟,唐永春.用干酪根生烃动力学方法预测甲烷生成量之一例［J］.科学通报,1998,43(11):1187-1191.］

Options

Outlines

模态框（Modal）标题

Abstract

Cite this article

References