Quantitative Characterization of Microscopic Pore Structures for the High-Yielding Shale Gas Reservoir of Longmaxi Formation in Zhaotong Demonstration Zone

Xinjiang Oil & Gas ›› 2021, Vol. 17 ›› Issue (3): 7-16.

• OIL AND GAS EXPLORATION • Previous Articles Next Articles

Quantitative Characterization of Microscopic Pore Structures for the High-Yielding Shale Gas Reservoir of Longmaxi Formation in Zhaotong Demonstration Zone

XIE Qingbin^1,2, WANG Jia¹, SONG Shuyu¹, ZHU Yixiu¹, WANG Yuhan¹, ZHANG Jiehui³

1. School of Geoscience,China University of Petroleum (Beijing),Changping 102249,Beijing,China;
2. Karamay Campus,China University of Petroleum (Beijing),Karamay 834000,Xinjiang,China;
3. PetroChina Zhejiang Oilfield Company,Hangzhou 310023,Zhejiang,China

Online:2021-09-10 Published:2021-09-10

昭通示范区龙马溪组页岩气高产储层微观孔隙结构定量表征

谢庆宾^1,2, 王佳¹, 宋姝豫¹, 朱毅秀¹, 王宇涵¹, 张介辉³

1.中国石油大学（北京）地球科学学院,北京 102249;
2.中国石油大学（北京）克拉玛依校区,新疆克拉玛依 834000;
3.中国石油天然气股份有限公司浙江油田分公司,浙江杭州 310023

作者简介:谢庆宾（1966-）,1990年毕业于中国石油大学（华东）石油地质专业,教授,主要从事沉积储层方面的研究工作。（Tel）13501246979（E-mail）xieqingbin@cup.edu.cn
基金资助:
国家重大科技专项“昭通页岩气勘探开发示范工程”（2016ZX05063002-006）; 中国石油大学（北京）克拉玛依校区科研启动基金

Abstract

Abstract: In this study,the high-yielding shale gas reservoir of Longmaxi Formation in Zhaotong Demonstration Zone is addressed. The microscopic pore structures of high-yielding shale gas reservoir were quantitatively characterized by field emission scanning electron microscopy,nitrogen adsorption experiment,X-ray diffraction (XRD),nuclear magnetic resonance experiment,nano-CT scanning technology and Image J image processing software. The study findings show that the rocks of shale gas reservoir mainly consist of greyish black - black shale rich in organic matters and with a porosity greater than 2% and a permeability greater than 0.01 ×10^-3 μm². Most of the pores are organic ones with good connectivity,and there are also some intergranular and intragranular pores,as well as a small number of micro-cracks. The pore size is in the range of 5~50 nm. The three types of pore structures are different in pore type,total organic content (TOC) and pore size. Type I pores are mainly organic ones,with high TOC and good reservoir quality. Type II pores have moderate organic content,which are mainly composed of micropores-mesopores provided by organic matters and clay minerals. Type III pores have low organic content,which are mainly composed of some micropores and mesopores provided by clay minerals.

Key words: Zhaotong Demonstration Zone, Longmaxi Formation, high-yielding shale gas reservoir, pore structure

摘要： 以昭通示范区龙马溪组页岩气高产储层为研究对象,通过场发射扫描电镜,氮气吸附实验,XRD衍射,核磁共振实验,纳米CT扫描技术和Image J图像处理软件,对页岩气高产储层微观孔隙结构进行定量表征。研究结果表明,页岩气高产储层的岩石类型以富含有机质的灰黑—黑色页岩为主,孔隙度大于2%,渗透率大于0.01×10^-3 μm²,孔隙类型以有机质孔为主,孔隙连通性好,其次为粒间孔,粒内孔和少量微裂缝,孔隙半径分布在5~50 nm之间,三类孔隙结构在孔隙类型,TOC含量和孔径分布方面各有差异,其中Ⅰ类孔隙结构主要为机质孔,TOC含量高,储层质量好。Ⅱ类孔隙有机质含量中等,主要是由有机质和黏土矿物提供的微孔-介孔构成;Ⅲ类孔隙有机质含量低,主要是由黏土矿物提供的部分微孔和介孔构成。

关键词: 昭通示范区, 龙马溪组, 页岩气高产储层, 孔隙结构

CLC Number:

TE348

XIE Qingbin, WANG Jia, SONG Shuyu, ZHU Yixiu, WANG Yuhan, ZHANG Jiehui. Quantitative Characterization of Microscopic Pore Structures for the High-Yielding Shale Gas Reservoir of Longmaxi Formation in Zhaotong Demonstration Zone[J]. Xinjiang Oil & Gas, 2021, 17(3): 7-16.

谢庆宾, 王佳, 宋姝豫, 朱毅秀, 王宇涵, 张介辉. 昭通示范区龙马溪组页岩气高产储层微观孔隙结构定量表征[J]. 新疆石油天然气, 2021, 17(3): 7-16.

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Quantitative Characterization of Microscopic Pore Structures for the High-Yielding Shale Gas Reservoir of Longmaxi Formation in Zhaotong Demonstration Zone

昭通示范区龙马溪组页岩气高产储层微观孔隙结构定量表征

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