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[1]邹华耀,郝芳,李平平,等.四川元坝地区须家河组沥青发育分布特征及其烃源岩排烃通道标志[J].地球科学与环境学报,2018,40(01):1-10.
　ZOU Hua-yao,HAO Fang,LI Ping-ping,et al.Distribution and Origin of the Bitumen and Its Trace for the Hydrocarbon-expelling Pathway of Xujiahe Formation in Yuanba Area of Sichuan, China[J].Journal of Earth Sciences and Environment,2018,40(01):1-10.
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四川元坝地区须家河组沥青发育分布特征及其烃源岩排烃通道标志(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第40卷
期数:
2018年第01期
页码:
1-10
栏目:
基础地质与矿产地质
出版日期:
2018-01-15

文章信息/Info

Title:
Distribution and Origin of the Bitumen and Its Trace for the Hydrocarbon-expelling Pathway of Xujiahe Formation in Yuanba Area of Sichuan, China
文章编号:
1672-6561(2018)01-0001-10
作者:
邹华耀; 郝芳; 李平平; 朱扬明; 张莉; 张俊武; 张升磊
1.中国石油大学（北京） 油气资源与探测国家重点实验室，北京 102249； 2.中国地质大学（武汉） 构造与油气资源教育部重点实验室，湖北 武汉 430074； 3.浙江大学 地球科学学院，浙江 杭州 310027
Author(s):
ZOU Hua-yao;  HAO Fang;  LI Ping-ping;  ZHU Yang-ming;  ZHANG Li;  ZHANG Jun-wu;  ZHANG Sheng-lei
1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; 2. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, Hubei, China; 3. School of Earth Sciences, Zhejiang University, Hangzhou 310027, Zhejiang, China
关键词:
沥青; 超压水力破裂缝; 排烃通道; 须家河组; 三芳甾烷; 裂缝; 元坝地区; 四川盆地
Keywords:
bitumen;  overpressure hydraulic fracture;  hydrocarbon-expelling pathway;  Xujiahe Formation;  triaromatic steroid;  fracture;  Yuanba area;  Sichuan Basin
分类号:
P618.130.2
DOI:
-
文献标志码:
A
摘要:
四川元坝地区须家河组为一套含煤层系。基于岩芯观测、沥青有机地球化学分析和沥青产状描述，发现泥质烃源岩与砂砾岩储层裂缝中广泛发育固体沥青，这些固体沥青是黏稠状原油裂解的产物；应用三芳甾烷分子标志物对比证实，该原油是由煤系泥质烃源岩中藻类为主的有机质生成的，从烃源岩排出过程中因黏稠度高而残留于运移通道中，成为排烃通道的识别标志。结合须家河组超压发育演化，建立了该层系超压驱动下烃源岩的排烃通道模式，烃源岩排烃可以分为时空上连续的两个过程，即油气初始凝聚于微裂缝和其后经(微)裂缝的排放。初始凝聚过程中烃类的相态、通道与排驱动力学还知之甚少，（微）裂缝排放通道主要由顺层理面及穿层的水力破裂缝组成，强超压与构造应力是（微）裂缝排放通道形成的动力学机制，由此推断超压水力破裂缝与构造裂缝是烃源岩排烃的主要通道。
Abstract:
Xujiahe Formation in Yuanba area of Sichuan, China, is composed of coal-bearing strata. Based on core observation and measurement, as well as organic geochemical analysis and bitumen-occurrence description, it is demonstrated that widespread solid bitumen presents within the fractures among argillaceous source rock and sandstone-conglomerate reservoir layers. The precursor of bitumen (namely palaeo-viscous oil) is generated from preferentially algae-rich organic matter in argillaceous source rocks, proved by using relative abundance correlation of triaromatic steroids contained in solid bitumen and extracted from argillaceous source rock and coal rock. Being viscous, the palaeo-oil easily remains along expelling route, consequently tracing the oil-expelling pathway. Combined with the analysis of overpressure evolution for Xujiahe Formation, a conceptual model of oil-expelling pathway is created, namely, a representative oil-expelling pathway model driven preferentially by overpressure. Oil-expelling pathway consists of two tempo-spatially continuous processes, including initial sweating and agglomerating into micro-fractures, and subsequent discharging along the micro/macro-fractures. Little is known about the initial process; but authentically, the discharging or expelling fractures are composed of hydraulic fractures occurred along laminae and bedding as well as across both of them, mainly formed by strong overpressure and tectonic stress. Consequently, the hydraulic fracture and the tectonic micro/macro-fracture are the most important expulsion-conduits.

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备注/Memo

备注/Memo:
收稿日期:2017-11-22;修回日期:2018-01-11
基金项目:国家自然科学基金项目(41472118)
作者简介:邹华耀(1963-),男,江西上高人,教授,博士研究生导师,工学博士,E-mail:huayaozou@cup.edu.cn。
更新日期/Last Update: 2018-03-08