石油与天然气地质
石油與天然氣地質
석유여천연기지질
OIL & GAS GEOLOGY
2014年
2期
272-279
,共8页
富有机质页岩%成藏条件%有利勘探区带%牛蹄塘组%上扬子地区
富有機質頁巖%成藏條件%有利勘探區帶%牛蹄塘組%上颺子地區
부유궤질혈암%성장조건%유리감탐구대%우제당조%상양자지구
organic-rich shale%accumulation condition%favorable exploration area%Niutitang Formation%Upper Yangtze region
基于上扬子地区下寒武统牛蹄塘组黑色页岩的野外露头、钻井、岩心等资料，通过显微薄片、扫描电镜及X-衍射、压汞分析、等温吸附等多项实验测试分析，以牛蹄塘组黑色页岩的地层、岩石学、地球化学、地球物理和页岩含气性等为重点，对上扬子地区下寒武统牛蹄塘组页岩气形成的成藏条件与特征进行了初步探索。研究表明上扬子地区下寒武统牛蹄塘组以浅水-深水陆棚沉积环境控制富有机质页岩的发育，沉积厚度一般在50～300 m；有机碳含量在1.5％以上，有机质成熟度达到高-过成熟阶段；富有机质页岩脆性矿物丰富、粘土矿物演化程度高，以伊利石稳定矿物为主，不含蒙脱石；多种孔隙类型及裂缝发育，可为页岩气的赋存提供良好储集空间；富有机质页岩含气量达到了页岩气商业开发下限2.0 m3/t。综合各种成藏条件，认为资阳-自贡一带、黔北和渝东南-湘鄂西地区为页岩气有利勘探区带。
基于上颺子地區下寒武統牛蹄塘組黑色頁巖的野外露頭、鑽井、巖心等資料，通過顯微薄片、掃描電鏡及X-衍射、壓汞分析、等溫吸附等多項實驗測試分析，以牛蹄塘組黑色頁巖的地層、巖石學、地毬化學、地毬物理和頁巖含氣性等為重點，對上颺子地區下寒武統牛蹄塘組頁巖氣形成的成藏條件與特徵進行瞭初步探索。研究錶明上颺子地區下寒武統牛蹄塘組以淺水-深水陸棚沉積環境控製富有機質頁巖的髮育，沉積厚度一般在50～300 m；有機碳含量在1.5％以上，有機質成熟度達到高-過成熟階段；富有機質頁巖脆性礦物豐富、粘土礦物縯化程度高，以伊利石穩定礦物為主，不含矇脫石；多種孔隙類型及裂縫髮育，可為頁巖氣的賦存提供良好儲集空間；富有機質頁巖含氣量達到瞭頁巖氣商業開髮下限2.0 m3/t。綜閤各種成藏條件，認為資暘-自貢一帶、黔北和渝東南-湘鄂西地區為頁巖氣有利勘探區帶。
기우상양자지구하한무통우제당조흑색혈암적야외로두、찬정、암심등자료，통과현미박편、소묘전경급X-연사、압홍분석、등온흡부등다항실험측시분석，이우제당조흑색혈암적지층、암석학、지구화학、지구물리화혈암함기성등위중점，대상양자지구하한무통우제당조혈암기형성적성장조건여특정진행료초보탐색。연구표명상양자지구하한무통우제당조이천수-심수륙붕침적배경공제부유궤질혈암적발육，침적후도일반재50～300 m；유궤탄함량재1.5％이상，유궤질성숙도체도고-과성숙계단；부유궤질혈암취성광물봉부、점토광물연화정도고，이이리석은정광물위주，불함몽탈석；다충공극류형급렬봉발육，가위혈암기적부존제공량호저집공간；부유궤질혈암함기량체도료혈암기상업개발하한2.0 m3/t。종합각충성장조건，인위자양-자공일대、검북화투동남-상악서지구위혈암기유리감탐구대。
Based on outcrops,drilling and core data,combining with analysis of thin section,SEM,X-ray diffraction,mer-cury porosimetry and isothermal adsorption ,this paper studied the accumulation conditions and characteristics of shale gas of the Lower Cambrian Niutitang Formation in Upper Yangtze Region ,with focus on the stratigraphic ,petrologic,geoche-mical and geophysical characteristics as well as gas storage capacity .The results show that the distribution of the organic-rich shale of the Lower Cambrian Niutitang Formation in Upper Yangtze Region is controlled by the shallow to deep water shelf sedimentary environment ,where shale thickness generally ranges from 50 to 300 m.The shale has a total organic carbon content over 1 .5%and is highly mature to over mature .The organic-rich shale has abundant brittle minerals and the clay minerals with high evolution are dominated by stable minerals such as illite but without any montmorillonite .The various types of pores and fractures provide effective reservoir space for shale gas ,and the gas content reaches the lowest commercial development value ( 2.0 m3/t ) .Comprehensive analysis of these conditions reveals that the Ziyang-Zigong area,the northern Guizhou ,eastsouthern Chongqing and eastern Hubei and Hunan Province are favorable exploration areas .
