川东北地区长兴组&mdash;飞仙关组礁滩相沉积体系优质储层形成过程及储集空间演化主控因素分析

李小燕，王琪,韩元红,田兵,许勇，王菲菲

doi:10.11764/j.issn.1672-1926.2014.10.1594

天然气地球科学 >

2014 , Vol. 25 >Issue 10: 1594 - 1602

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.10.1594

天然气地质学

川东北地区长兴组—飞仙关组礁滩相沉积体系优质储层形成过程及储集空间演化主控因素分析

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1.中国科学院兰州文献情报中心，甘肃兰州730000；
2.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室，甘肃兰州 730000；3.中国科学院大学，北京 100049|4.陕西延长石油(集团)有限责任公司研究院，陕西西安 710075

李小燕(1982-)，女，甘肃静宁人，编辑，硕士，主要从事编辑出版、油气地质及其情报方面的研究. E-mail:lixy@llas.ac.cn.

收稿日期: 2014-03-16

修回日期: 2014-05-16

网络出版日期: 2014-10-10

基金资助

中国科学院西部之光联合学者项目资助.
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Main Control Factors and Analysis of Reservoir Space Evolution of Reef-Beach Facies in Changxing - Feixianguan Formation of northeastern Sichuan Area

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(1.Lanzhou Library of Chinese Academy of Sciences,Lanz hou 730000,China；2.Key Laboratory of Petroleum Resources Research,Gansu Province/ Key Laboratory of Petroleum Resources Research,
Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China；
3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China；
4.Research Institute of Shaanxi Yanchang Petoroleum(Group)CO.,LTD,xi′an 710075,China)

Received date: 2014-03-16

Revised date: 2014-05-16

Online published: 2014-10-10

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摘要

川东北地区长兴组—飞仙关组发育的台地边缘礁滩相和浅滩相沉积体系，为优质储层发育奠定了基础。储层现今的孔隙类型主要是以粒间孔、晶间孔、生物体腔孔和各种溶蚀孔以及裂缝为主的次生孔隙，原生孔隙已基本被成岩作用所改造，其中晶间孔、溶蚀孔及裂缝是研究区主要的储集空间。在地质历史时期，该区储层主要经历了7种成岩作用，各种成岩作用均对台地边缘礁滩相和浅滩相沉积体系进行了改造，但影响效果较明显的是白云岩化、溶蚀及破裂等作用，其作用结果为优质储层的发育提供了条件:白云岩化作用改造了礁滩相储层孔隙结构，溶蚀作用进一步扩大溶蚀孔洞的发育效果，破裂作用连通孔隙并提供油气运移通道。基于岩心与薄片的鉴定及扫描电镜分析资料，通过对研究区不同岩石类型储集空间发育特征、成岩环境、岩体特征及储层发育条件分析研究，认为礁滩相沉积体系优质储层发育主要受3方面因素控制:礁滩相沉积微相、成岩作用及构造破裂作用。在此控制之下长兴组生物礁滩相储层孔隙分原生孔、晶间孔及早期和晚期埋藏溶解孔4个演化阶段，飞仙关组礁滩相储层孔隙演化与长兴组有着相似的发育过程，但其孔隙类型稍有不同，分为原生孔、鲕模孔/粒内溶孔及浅埋和深埋溶孔4个演化阶段|整体上礁滩相优质储层只有在后期白云岩化、破裂作用及溶蚀作用改造后，才能发育成为优质储层。
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关键词： 成岩作用; 孔隙; 礁滩相储层; 白云岩化; 川东北地区; 长兴组—飞仙关组

本文引用格式

李小燕，王琪,韩元红,田兵,许勇，王菲菲 . 川东北地区长兴组—飞仙关组礁滩相沉积体系优质储层形成过程及储集空间演化主控因素分析[J]. 天然气地球科学, 2014 , 25(10) : 1594 -1602 . DOI: 10.11764/j.issn.1672-1926.2014.10.1594

Abstract

The Platform margin reef-beach facies and shoals facies were the foundation for high-quality reservoir development in Changxing-Feixianguan Formation of Northeastern Sichuan Area.Today's reservoir pore type is dominated by secondary porosity,including intergranular pore,interquartz pore,biological visceral pore,various types of dissolved pore,and cracks.Primary porosity has basically been transformed by diagenesis.Among them,interquartz pore,corrosion pore and cracks are the main reservoir space in the study area.In geological history,the study area has experienced seven kinds of main diagenesis,which have different effects on the reef-beach and shoals depositional system,especially the dolomitization,dissolution and fracturing.These effect results provide conditions for the development of high-quality reservoir:dolomitization transformed the reservoir pore structure of reef-beach facies,dissolution expanded solution pore types further,fracturing interconnected pores and provide migration pathways.Based on the SEM analyses and identification of core and flakes,reservoir space development features,diagenetic environment,rock characteristics and reservoir developmental conditions,the development of high quality reservoir system of reef-beach facies of different rock types in the study area is mainly controlled by three factors:reef-beach sedimentary microfacies,diagenesis,tectonic disruption.Under these three controlling factors,reef-beach facies reservoir porosity of Changxing Formation and Feixianguan Formation has a similar developmental process.They all experienced four-stage evolution process,and the slight difference is its pore types.The Changxing Formation porosity evolution process can be divided into original hole,intergranular hole,early burial dissolution hole and late burial dissolution|The Feixianguan Formation porosity evolution process can be divided into primary hole,oolitic die hole/grains dissolved pores,shallow holes and deep holes.In summary,dolomitization,fracturing,and dissolution are the key factors for reef-beach facies to develop into high quality reservoir.

Key words： Diagenesis; Porosity; Reef reservoirs; Dolomitization; Northeast Sichuan area; Changxing-Feixianguan Formation

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