摘要
渝西地区五峰组—龙马溪组龙一_(1)亚段页岩具有巨大的勘探开发潜力,为了明确其不同岩相的储层品质差异、纵向分布规律及其储层发育影响因素等,结合岩石薄片鉴定、岩石组分、地球化学分析等进行了岩相划分,并综合有机碳含量、纹层结构、储集空间与物性、含气量等资料确定了不同岩相的储层特征、有利岩相分布及控制因素等。结果表明:研究层段发育高碳硅质页岩、中碳硅质页岩、低碳硅质页岩、低碳钙质-硅质页岩、低碳黏土质页岩、特低碳黏土质页岩6种岩相。高碳硅质页岩沉积环境还原性强,沉积水体深,生物繁盛,生物硅含量高,泥纹层发育,为优质页岩储层,有利于连片有机质和有机质孔的发育与保存,主要发育于龙马溪组底部1小层,为页岩气富集提供了有利生储条件;中碳硅质页岩与低碳硅质页岩沉积环境还原性较强,沉积水体变浅,生物繁盛程度降低,生物硅含量偏低,粉砂纹层和泥纹层频繁交互,有机质孔主要发育于分散状有机质中,是潜在的可开发页岩气储层,主要发育于五峰组顶部、龙马溪组2小层和3小层。该研究结果深化了研究区有利页岩储层纵向分布的认识,为页岩气立体开发提供了基础数据支撑。
Shale in Wufeng Formation-lower Long 1 submember of Longmaxi Formation in western Chongqing has great potential of exploration and development.In order to clarify the difference of reservoir quality,longitudinal distribution law and influencing factors of reservoir development of different lithofacies,the lithofacies was divided combined with thin section identification,rock composition and geochemistry characteristics.Based on the data of organic carbon content,laminar structure,reservoir space and physical properties,and gas content,the reservoir characteristics,favorable lithofacies distribution and controlling factors of different lithofacies were determined.The results show that there are six kinds of shale lithofacies:organic-rich siliceous shale,moderateorganic siliceous shale,low-organic siliceous shale,low-organic calcareous siliceous shale,low-organic clay shale and extra-low-organic clay shale.The organic-rich siliceous shale is a high-quality shale reservoir with its sedimentary environment characterized by strong reducibility,deep water body,abundant organisms,high biogenic silicon content and well-developed argillaceous lamination,which is conducive to the development and preservation of contiguous organic matter and organic pores.It is mainly developed in sublayer-1 of Long 1 submember of Longmaxi Formation,providing favorable source-reservoir conditions for shale gas enrichment.The moderate-organic siliceous shale and low-organic siliceous shale are deposited in strong reducibility and shallow water sedimentary environment,with decreased organisms,low biogenic silicon content,frequent interbedding of silt lamination and argillaceous lamination,and organic pores are mainly developed in dispersed organic matter with good connectivity.So,they are potential exploitable shale gas reservoirs,and mainly developed in the top of Wufeng Formation,sublayer-2 and sublayer-3 of Long 1 submember of Longmaxi Formation.The research results deepen the understanding of the vertical distribution of favorable shale r
作者
尹兴平
蒋裕强
付永红
张雪梅
雷治安
陈超
张海杰
YIN Xingping;JIANG Yuqiang;FU Yonghong;ZHANG Xuemei;LEI Zhian;CHEN Chao;ZHANG Haijie(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China;Reservoir Evaluation Laboratory,PetroChina Key Laboratory of Unconventional Oil and Gas,Chengdu 610500,China;Sichuan Kehong Oil and Gas Engineering Co.,Ltd.,Chengdu 610056,China;Chongqing Shale Gas Exploration and Development Company Limited,Chongqing 610213,China;Sichuan Changing Natural Gas Development Company Limited,Chengdu 610056,China)
出处
《岩性油气藏》
CSCD
北大核心
2021年第4期41-51,共11页
Lithologic Reservoirs
基金
中石油-西南石油大学创新联合体项目二课题专题四“复杂地质条件下川南深层/昭通中浅层海相页岩气赋存机制及控制因素研究”(编号:2020CX020104)资助。
关键词
页岩气
岩相
储层特征
控制因素
龙马溪组
渝西地区
shale gas
lithofacies
reservoir characteristics
controlling factors
Longmaxi Formation
western Chongqing
