玛页1井风城组页岩微观孔隙特征及其影响因素  

Micro-Pore Characteristics and Influencing Factors of Fengcheng Formation Shale in Well Maye-1

作　　者：杨帆 孟鑫[2] 王先虎 余佩蓉 邵广辉 陈火红 YANG Fan;MENG Xin;WANG Xianhu;YU Peirong;SHAO Guanghui;CHEN Huohong(Research Institute of Geology,CNPC Logging Co.,Ltd.,Xi’an,Shaanxi 710077,China;PetroChina Xinjiang Oilfield Company,Development Company,Karamay,Xinjiang 834000,China;PetroChina Xinjiang Oilfield Company,Research Institute of Exploration and Development,Karamay,Xinjiang 834000,China;Xinjiang Branch,CNPC Logging Co.,Ltd.,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油集团测井有限公司地质研究院,西安710077 [2]中国石油新疆油田分公司开发公司,新疆克拉玛依834000 [3]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [4]中国石油集团测井有限公司新疆分公司,新疆克拉玛依834000

出　　处：《新疆石油地质》2022年第1期1-10,共10页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05046-006)。

摘　　要：玛湖凹陷风城组页岩微观孔隙特征的相关研究较薄弱,为确定孔隙对页岩油赋存和富集的影响,以玛湖凹陷北斜坡区玛页1井为对象,利用X射线衍射、扫描电镜、低温液氮吸附、高压压汞等,分析陆相页岩纳米级孔隙的发育特征及其影响因素。风城组页岩主要为长英质岩和碳酸盐岩,2类岩相的孔隙类型、形态及孔径分布基本一致,孔隙类型有无机孔、有机质孔和微裂缝,主要为溶蚀孔和微裂缝,发育平行板状狭缝、楔状孔隙及墨水瓶状孔等多种形态;孔隙以小孔为主,孔径分布为三峰型,主峰位于30~60 nm,孔隙连通性差。长英质岩的孔隙度及大孔隙发育程度高于碳酸盐岩,是相对优势岩相。石英、长石和白云石是孔隙发育程度的主控因素,对各尺度的孔隙具有均势贡献;黏土矿物促进微孔和小孔的发育,对中孔的影响较弱;有机质对孔隙发育的影响较小;无机矿物和有机质均是页岩孔隙度增大的有利因素。Less researches have been carried out on the microscopic pore characteristics of the Fengcheng formation shale in the Mahu sag.In order to determine the influence of pores on the occurrence and enrichment of shale oil, taking Well Maye-1 in the northwestern slope of the Mahu sag as a case, the characteristics of nano-pores and influencing factors in the continental shale were analyzed through X-ray diffraction, SEM, liquid nitrogen adsorption, high-pressure mercury intrusion, etc. The shale in the Fengcheng formation is mainly composed of felsic rock and carbonate rock. In the two kinds of rocks, the types, shapes and sizes of the pores are almost similar. There are inorganic pores, organic pores and micro-fractures, of which dissolution pores and micro-fractures are dominant. In addition, there are parallel plateshaped fractures, wedge-shaped pores and ink-bottle-shaped pores. The pores are mainly small ones. The distribution of the pore size shows three peaks and the main peak ranges from 30 nm to 60 nm, and the pore connectivity is poor. The porosity of the felsic rock is higher than that of the carbonate rock, and macro-pores develop better in the felsic rock. So the felsic rock is more favorable for exploration. Quartz,feldspar and dolomite are controlling factors on pore development, and they have a balanced contribution to the pores of various sizes. Clay minerals are favorable for the development of micropores and small pores, but have a weaker impact on mesopores. Organic matter has a little effect on pore development. Both inorganic minerals and organic matter are favorable factors for the increase of shale porosity.

关 键 词：玛湖凹陷 玛页1井 风城组 页岩 微观孔隙 影响因素 岩相 矿物组分 

分 类 号：TE122.23[石油与天然气工程—油气勘探]