东海盆地西湖凹陷主力烃源岩特征及分布

doi:10.7623/syxb201608003

石油学报 ›› 2016, Vol. 37 ›› Issue (8): 962-974.DOI: 10.7623/syxb201608003

东海盆地西湖凹陷主力烃源岩特征及分布

宋春刚¹, 曹强^2,3, 叶加仁^2,3, 雷闯⁴, 单超^2,3

1. 中国地质大学地球科学与资源学院北京 100083;
2. 中国地质大学资源学院湖北武汉 430074;
3. 中国地质大学构造与油气资源教育部重点实验室湖北武汉 430074;
4. 中国石油冀东油田公司河北唐山 063000

收稿日期:2015-12-09 修回日期:2016-07-04 出版日期:2016-08-25 发布日期:2016-09-02
通讯作者: 宋春刚,男,1991年3月生,2014年获中国地质大学(武汉)资源学院学士学位,现为中国地质大学(北京)地球科学与资源学院硕士研究生,主要从事沉积学和油气储层地质方面的研究工作。Email:scg199165@126.com
作者简介:曹强,男,1983年4月生,2005年获中国地质大学(武汉)学士学位,2010年获中国地质大学(武汉)博士学位,现为中国地质大学(武汉)资源学院讲师,主要从事天然气地球化学及油藏动力学方面的研究工作。Email:qcao@cug.edu.cn
基金资助:
中国石油化工股份有限公司上海海洋油气分公司科技先导项目“西湖凹陷原生油气藏成藏机理及模式研究”（No.20140122）和国家自然科学基金项目“残余盆地古流体动力场演化”（No.40172051）资助。

Characteristics and distribution of main source rocks in Xihu sag, East China Sea Basin

Song Chungang¹, Cao Qiang^2,3, Ye Jiaren^2,3, Lei Chuang⁴, Shan Chao^2,3

1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;
2. College of Resources, China University of Geosciences, Hubei Wuhan 430074, China;
3. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Hubei Wuhan 430074, China;
4. PetroChina Jidong Oilfield Company, Hebei Tangshan 063000, China

Received:2015-12-09 Revised:2016-07-04 Online:2016-08-25 Published:2016-09-02

摘要/Abstract

摘要：

基于近年大量勘探成果，结合地球化学分析和盆地模拟技术，综合分析确定了西湖凹陷烃源岩的有机地球化学和分布特征，并探讨了区内天然气成因及来源。结果表明，西湖凹陷主要发育平湖组和花港组2套源岩，岩性主要为暗色泥岩和煤，平湖组煤系源岩为该区主力供烃层系，最大厚度分布于保俶斜坡带中部及三潭深凹—中央背斜带中南部，并沿凹陷两侧逐渐减薄。源岩评价表明平湖组以中—好烃源岩为主，泥岩有机质类型以Ⅱ₂型和Ⅲ型为主，煤以Ⅲ型为主；三潭深凹与中央背斜带内平湖组现今多处于成熟—过成熟阶段，其源岩成熟早且生气强度明显高于生油强度。有机质生源以陆源高等植物为主，形成于淡水—微咸水、偏氧化的沉积环境。西湖凹陷天然气以烃类气体为主，多属煤型气；西湖凹陷天然气成熟度（R_o值）多在0.58%～1.97%，为成熟—高熟源岩热演化产物。中央背斜带及三潭深凹花港组产出的天然气主要来源于自身下部平湖组成熟—高熟源岩，亦有该区花港组下段成熟源岩贡献；保俶斜坡带中部平湖构造带花港组产出天然气主要来源于花港组自生；保俶斜坡带平湖组产出天然气多来源于平湖组，部分井产出的高熟气样可能来源于邻区三潭深凹高熟平湖组源岩贡献。系统分析西湖凹陷主力烃源岩特征及分布规律，对深化油气勘探具有实际指导意义。

关键词: 西湖凹陷, 烃源岩, 平湖组, 花港组, 成熟度, 气源对比

Abstract:

Based on a large number of exploration achievements in recent years, in combination with geochemical analysis and basin simulation technology, this study comprehensively analyzes and determines the organic geochemistry and distribution characteristics of source rocks in Xihu depression, and also discusses the genesis and source of regional natural gas as well. The results show that two major sets of source rocks in Pinghu Formation and Huagang Formation are developed in Xihu depression, mainly composed of dark mudstone and coal. The coal-measure source rocks in Pinghu Formation are the major hydrocarbon supply layers in the study area, of which the maximum thickness was observed in the middle of Baoshu slope belt and the mid-south part of Santan Deep depression-Central Anticline Belt, gradually thinning along both sides of the depression. The evaluations of source rocks show that Pinghu Formation is dominated by moderate/high-quality source rocks, where the Type Ⅱ₂ and Type Ⅲ mudstones and Type Ⅲ coal organic matter are mainly development. Presently, Pinghu Formation in the Santan Deep depression and Central Anticline Belt is during the mature-over mature stage, of which the source rocks are early mature with gas generation intensity obviously higher than oil generation intensity. The main sources of organic matter include terrigenous higher plants, which were formed in the fresh-brackish water oxidized sedimentary environment. Natural gas in Xihu depression is dominated by hydrocarbon gas, mostly belonging to coal-type gas, of which the maturity (R_o) is ranged between 0.58% -1.97%, indicating the thermal evolution product of mature and highly mature source rocks. Natural gas generated in Huagang Formation of Central Anticline Belt and Santan Deep depression was mainly originated from the mature and highly mature source rocks of Lower Pinghu Formation, to which the mature source rocks of Lower Huagang Formation also made contributions. In the middle of Baochu slope belt, natural gas was self-produced in Huagang Formation, Pinghu Structural Zone. Meanwhile, the natural gas was mostly self-produced in Pinghu Formation, while the highly mature gas samples from some gas wells might be originated from the highly mature source rocks in Pinghu Formation of the adjacent Santan Deep depression. A systematic analysis on the characteristics and distribution laws of chief source rocks in Xihu depression is of practical guiding significance to further oil and gas exploration.

Key words: Xihu depression, source rock, Pinghu Formation, Huagang Formation, maturity, gas-source correlation

中图分类号:

TE122.2

宋春刚, 曹强, 叶加仁, 雷闯, 单超. 东海盆地西湖凹陷主力烃源岩特征及分布[J]. 石油学报, 2016, 37(8): 962-974.

Song Chungang, Cao Qiang, Ye Jiaren, Lei Chuang, Shan Chao. Characteristics and distribution of main source rocks in Xihu sag, East China Sea Basin[J]. Acta Petrolei Sinica, 2016, 37(8): 962-974.

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东海盆地西湖凹陷主力烃源岩特征及分布

Characteristics and distribution of main source rocks in Xihu sag, East China Sea Basin

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