基于米氏聚煤旋回划分的西湖凹陷平湖组煤系烃源岩发育特征

doi:10.7623/syxb201606002

石油学报 ›› 2016, Vol. 37 ›› Issue (6): 706-714.DOI: 10.7623/syxb201606002

基于米氏聚煤旋回划分的西湖凹陷平湖组煤系烃源岩发育特征

沈玉林^1,2, 秦勇^1,2, 郭英海^1,2, 赵志刚³, 袁学旭⁴, 屈争辉^1,2, 谢国梁⁵

1. 中国矿业大学煤层气资源与成藏过程教育部重点实验室江苏徐州 221116;
2. 中国矿业大学资源与地球科学学院江苏徐州 221116;
3. 中海油研究总院北京 100028;
4. 辽宁工程技术大学矿业学院辽宁阜新 123000;
5. 江西省煤田地质局223地质队江西鹰潭 335000

收稿日期:2015-12-25 修回日期:2016-04-26 出版日期:2016-06-25 发布日期:2016-06-30
通讯作者: 沈玉林,男,1981年3月生,2003年获中国矿业大学学士学位,2009年获中国矿业大学博士学位,现为中国矿业大学副教授,主要从事煤、油气地质及沉积学的教学与科研工作。Email:yulinsh@163.com
作者简介:沈玉林,男,1981年3月生,2003年获中国矿业大学学士学位,2009年获中国矿业大学博士学位,现为中国矿业大学副教授,主要从事煤、油气地质及沉积学的教学与科研工作。Email:yulinsh@163.com
基金资助:
国家重大科技专项(2011ZX05023-001-008)资助。

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

Shen Yulin^1,2, Qin Yong^1,2, Guo Yinghai^1,2, Zhao Zhigang³, Yuan Xuexu⁴, Qu Zhenghui^1,2, Xie Guoliang⁵

1. Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process, the Ministry of Education, China University of Mining and Technology, Jiangsu Xuzhou 221116, China;
2. School of Resource and Geoscience, China University of Mining and Technology, Jiangsu Xuzhou 221116, China;
3. CNOOC Research Institute, Beijing 100028, China;
4. College of Mining Engineering, Liaoning Technical University, Liaoning Fuxin 123000, China;
5. No.223 Geological Prospecting Team of Jiangxi Coal Geological Bureau, Jiangxi Yingtan 335000, China

Received:2015-12-25 Revised:2016-04-26 Online:2016-06-25 Published:2016-06-30

摘要/Abstract

摘要：

基于钻测井、岩心观测、地震剖面及地球化学分析测试结果等资料综合分析,运用小波分析对西湖凹陷平湖组进行了米氏旋回划分,探讨了平湖组煤系烃源岩发育规律,总结了煤系烃源岩发育的控制因素,建立了西湖凹陷平湖组聚煤模式。研究表明:平湖组可划分为3个长期旋回(与平湖组的段大致相当),并进一步划分为12个中期旋回和48个短期旋回,进而将平湖组划分为12个聚煤周期、48个煤组,聚煤周期发育受米兰科维奇周期控制,米氏周期右拐点即气候相对温暖湿润时期是聚煤的理想时期,凹陷范围内可追踪对比,煤层等煤系烃源岩的发育严格受沉积相带展布控制。指出强烈的同沉积断裂活动是平湖组煤层薄、层数多的主要原因,相对海平面上升时期是成煤关键期、相带演化控制聚煤中心迁移、废弃三角洲是煤层最有利的聚集场所。

关键词: 米氏旋回, 聚煤规律, 沉积环境, 海侵, 平湖组, 西湖凹陷

Abstract:

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.

Key words: Milankovich cycle, coal accumulation, sedimentary environment, transgression, Pinghu Formation, Xihu sag

中图分类号:

TE121.3

沈玉林, 秦勇, 郭英海, 赵志刚, 袁学旭, 屈争辉, 谢国梁. 基于米氏聚煤旋回划分的西湖凹陷平湖组煤系烃源岩发育特征[J]. 石油学报, 2016, 37(6): 706-714.

Shen Yulin, Qin Yong, Guo Yinghai, Zhao Zhigang, Yuan Xuexu, Qu Zhenghui, Xie Guoliang. Development characteristics of coal-measure source rocks divided on the basis of Milankovich coal accumulation cycle in Pinghu Formation, Xihu sag[J]. Acta Petrolei Sinica, 2016, 37(6): 706-714.

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基于米氏聚煤旋回划分的西湖凹陷平湖组煤系烃源岩发育特征

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

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