石油实验地质
石油實驗地質
석유실험지질
EXPERIMENTAL PETROLEUM GEOLOGY
2015年
1期
109-116
,共8页
马勇%钟宁宁%程礼军%潘哲君%李红英%谢庆明%李超
馬勇%鐘寧寧%程禮軍%潘哲君%李紅英%謝慶明%李超
마용%종저저%정례군%반철군%리홍영%사경명%리초
聚焦离子束扫描电镜%有机质孔隙%三维重构%牛蹄塘组%五峰组-龙马溪组%渝东南地区
聚焦離子束掃描電鏡%有機質孔隙%三維重構%牛蹄塘組%五峰組-龍馬溪組%渝東南地區
취초리자속소묘전경%유궤질공극%삼유중구%우제당조%오봉조-룡마계조%투동남지구
FIB-SEM%organic-matter pores%three-dimensional reconstruction%Niutitang Formation%Wufeng-Longmaxi formations%southeastern Chongqing area
使用聚焦离子束扫描电镜（ FIB－SEM）对渝东南地区下寒武统牛蹄塘组和上奥陶统五峰组—下志留统龙马溪组2套富有机质页岩的孔隙结构进行了系统观察，并对页岩纳米级有机质孔隙进行了三维重构和孔隙结构参数定量分析。研究发现，五峰组—龙马溪组页岩内层间微裂隙、矿物粒内孔、矿物粒间孔和有机质孔隙均较为发育。其中，有机质孔隙呈蜂窝状均匀发育，孔隙半径集中在3～100 nm，孔隙连通性较好，FIB－SEM三维重构计算有机质孔隙度在9．13％～18．42％之间，岩石总孔隙度中有机质孔隙度的贡献受控于TOC含量；牛蹄塘组页岩内溶蚀孔和粒间孔较为发育，有机质孔隙发育不均匀，孔隙呈扁平状或针孔状，孔隙半径集中在3～25 nm，孔隙连通性较差，有机质孔隙度在1．59％以下，有机质孔隙度对岩石总孔隙度的贡献与TOC含量关系较小，页岩的总孔隙度主要来自于矿物基质孔。 FIB－SEM揭示了2套页岩有机质孔隙结构存在较大差异。
使用聚焦離子束掃描電鏡（ FIB－SEM）對渝東南地區下寒武統牛蹄塘組和上奧陶統五峰組—下誌留統龍馬溪組2套富有機質頁巖的孔隙結構進行瞭繫統觀察，併對頁巖納米級有機質孔隙進行瞭三維重構和孔隙結構參數定量分析。研究髮現，五峰組—龍馬溪組頁巖內層間微裂隙、礦物粒內孔、礦物粒間孔和有機質孔隙均較為髮育。其中，有機質孔隙呈蜂窩狀均勻髮育，孔隙半徑集中在3～100 nm，孔隙連通性較好，FIB－SEM三維重構計算有機質孔隙度在9．13％～18．42％之間，巖石總孔隙度中有機質孔隙度的貢獻受控于TOC含量；牛蹄塘組頁巖內溶蝕孔和粒間孔較為髮育，有機質孔隙髮育不均勻，孔隙呈扁平狀或針孔狀，孔隙半徑集中在3～25 nm，孔隙連通性較差，有機質孔隙度在1．59％以下，有機質孔隙度對巖石總孔隙度的貢獻與TOC含量關繫較小，頁巖的總孔隙度主要來自于礦物基質孔。 FIB－SEM揭示瞭2套頁巖有機質孔隙結構存在較大差異。
사용취초리자속소묘전경（ FIB－SEM）대투동남지구하한무통우제당조화상오도통오봉조—하지류통룡마계조2투부유궤질혈암적공극결구진행료계통관찰，병대혈암납미급유궤질공극진행료삼유중구화공극결구삼수정량분석。연구발현，오봉조—룡마계조혈암내층간미렬극、광물립내공、광물립간공화유궤질공극균교위발육。기중，유궤질공극정봉와상균균발육，공극반경집중재3～100 nm，공극련통성교호，FIB－SEM삼유중구계산유궤질공극도재9．13％～18．42％지간，암석총공극도중유궤질공극도적공헌수공우TOC함량；우제당조혈암내용식공화립간공교위발육，유궤질공극발육불균균，공극정편평상혹침공상，공극반경집중재3～25 nm，공극련통성교차，유궤질공극도재1．59％이하，유궤질공극도대암석총공극도적공헌여TOC함량관계교소，혈암적총공극도주요래자우광물기질공。 FIB－SEM게시료2투혈암유궤질공극결구존재교대차이。
We used a Focused Ion Beam Scanning Electron Microscope ( FIB-SEM) to observe the pore struc?tures of the Lower Cambrian Niutitang shale and the Upper Ordovician Wufeng to Lower Silurian Longmaxi shale, sampled in the southeast of Chongqing. Three?dimensional distributions of the nanometer?sized organic?matter pores were reconstructed and their pore structure parameters were analyzed quantitatively. Our work indicated that microfractures between strata, interparticle and intraparticle pores in the mineral matrix, and organic?matter pores were well?developed in the Wufeng-Longmaxi formations. Pores within organic matter form a well?distribu?ted honeycomb like structure with good connectivity, and the pore radius is between 3 and 100 nm. Porosity of organic matter calculated using the FIB-SEM 3?D reconstruction is between 9.13% and 18.42%,and the contri?bution of organic?matter pores in the total porosity is correlated with the total organic carbon ( TOC) content. Dis?solution pores and interparticle pores are developed in the Niutitang Formation while organic?matter pores are un?evenly distributed. The organic?matter pores are tabular or pinhole with the pore radius between 3 and 25 nm and have poor connectivity. The calculated organic?matter porosity is below 1.59% and has little relationship with the TOC content. So the total porosity in the Niutitang shale mainly comes from the mineral matrix pores. The FIB-SEM results have shown significant differences in the pore structure of the two shales.
