煤田地质与勘探
煤田地質與勘探
매전지질여감탐
COAL GEOLOGY & EXPLORATION
2015年
3期
22-27,32
,共7页
龙马溪组%页岩气%储层%特征%分布
龍馬溪組%頁巖氣%儲層%特徵%分佈
룡마계조%혈암기%저층%특정%분포
Longmaxi Formation%shale gas%reservoir%characteristics%distribution
为了评价贵州省志留系下统龙马溪组页岩气资源开发潜力，开展了野外地质调查及页岩气井勘探工作，研究了龙马溪组页岩气储层特征及其分布规律。研究表明：贵州龙马溪组地层主要分布于遵义–余庆一线以北，页岩干酪根类型以 I 型和 II1型为主，有机碳质量分数普遍小于2%，Ro值为1.5%~3.39%，且下部有机质成熟度明显高于上部；页岩矿物组成以碎屑矿物及黏土矿物为主，表现出较强脆性；页岩孔隙相对发育，以孔隙型、孔隙–裂缝型储集空间为主，主缝、微缝、粘土矿物层间孔缝形成理想的解吸–渗流通道；页岩抗压、抗张强度差异较大，但水介质对页岩强度的影响不大；页岩含气量范围0.63~2.81 m3/t，表现出随深度增加而增大的趋势；扬子地台所历经的多期次构造活动对区域页岩气保存产生了重要影响，正安–务川–沿河以北是贵州龙马溪组页岩气保存的有利区。
為瞭評價貴州省誌留繫下統龍馬溪組頁巖氣資源開髮潛力，開展瞭野外地質調查及頁巖氣井勘探工作，研究瞭龍馬溪組頁巖氣儲層特徵及其分佈規律。研究錶明：貴州龍馬溪組地層主要分佈于遵義–餘慶一線以北，頁巖榦酪根類型以 I 型和 II1型為主，有機碳質量分數普遍小于2%，Ro值為1.5%~3.39%，且下部有機質成熟度明顯高于上部；頁巖礦物組成以碎屑礦物及黏土礦物為主，錶現齣較彊脆性；頁巖孔隙相對髮育，以孔隙型、孔隙–裂縫型儲集空間為主，主縫、微縫、粘土礦物層間孔縫形成理想的解吸–滲流通道；頁巖抗壓、抗張彊度差異較大，但水介質對頁巖彊度的影響不大；頁巖含氣量範圍0.63~2.81 m3/t，錶現齣隨深度增加而增大的趨勢；颺子地檯所歷經的多期次構造活動對區域頁巖氣保存產生瞭重要影響，正安–務川–沿河以北是貴州龍馬溪組頁巖氣保存的有利區。
위료평개귀주성지류계하통룡마계조혈암기자원개발잠력，개전료야외지질조사급혈암기정감탐공작，연구료룡마계조혈암기저층특정급기분포규률。연구표명：귀주룡마계조지층주요분포우준의–여경일선이북，혈암간락근류형이 I 형화 II1형위주，유궤탄질량분수보편소우2%，Ro치위1.5%~3.39%，차하부유궤질성숙도명현고우상부；혈암광물조성이쇄설광물급점토광물위주，표현출교강취성；혈암공극상대발육，이공극형、공극–렬봉형저집공간위주，주봉、미봉、점토광물층간공봉형성이상적해흡–삼류통도；혈암항압、항장강도차이교대，단수개질대혈암강도적영향불대；혈암함기량범위0.63~2.81 m3/t，표현출수심도증가이증대적추세；양자지태소력경적다기차구조활동대구역혈암기보존산생료중요영향，정안–무천–연하이북시귀주룡마계조혈암기보존적유리구。
The work of geology survey and investigation on shale gas has been done to reasonably evaluate the gas resource potential of Lower Silurian Longmaxi Formation. It has been shown by the research that Longmaxi For-mation in Guizhou Province mainly distributes in areas north of Zunyi-Yuqing whereⅠ-type kerogen andⅡ1-type kerogen in the shale predominate and the content of organic carbon in the shale is usually under 2%, with the Ro between 1.5% to 3.39% and the lower part of the formation has higher organic matter maturity. As it formed ma-jorly by detrital minerals and clay minerals, shale shows strong brittleness. Porosity in shale develops compara-tively well and the major fracture, micro fracture together with pore and fracture between clay mineral layers form good desorption-seepage channels. Compressive strength is significantly different from tensile strength, while wa-ter medium has no obvious effect on the intensity of shale. Shale gas contents are in the range of 0.63~2.81 m3/t, which show increasing trend with the increase of depth. Yangtze platform suffered multi-stage tectonic transform, which caused strong effect on the reserve of shale gas in Longmaxi Formation and the excellent shale gas reservoirs in Guizhou Province mainly distribute in areas north of Zhengan-Wuchuan-Yanhe.
