基于地质异常理论的页岩气有利区块圈定与定量评价——以渝东南地区下志留统龙马溪组为例  

Shale gas favorable blocks delineation and quantitative evaluation based on the geological anomaly theory:A case study of the Lower Silurian Longmaxi Formation,the southeastern area of Chongqing

作　　者：赵鹏大[1] 李桂范[1] 张金川[2] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院 [2]中国地质大学(北京)能源学院

出　　处：《天然气工业》2012年第6期1-8,103,共8页Natural Gas Industry

摘　　要：目前国内有关页岩气的研究主要集中在页岩气的成藏机理、页岩气成藏的地质条件和远景区预测,而对页岩气勘探理论和方法的研究则相对比较薄弱,这在一定程度上制约了我国页岩气工业化进程。为此,以地质异常找矿理论为指导,结合页岩气的地质特征,提出了页岩气有利区块圈定与定量评价方法。利用渝东南地区下志留统龙马溪组71个露头剖面和渝页1井的数据,根据页岩埋深、厚度、有机质含量、黏土矿物含量、石英含量等5个页岩气有利区地质异常关键指标及其阈值,预测了渝东南地区大有、武隆、彭水、连湖、黔江、太极和酉阳7个龙马溪组页岩气有利区段。通过对有利区段进行有利度定量评价,圈定出渝东南地区武隆、黔江西、黔江东、太极西、连湖东、连湖西、连湖中、彭水鹿角西、彭水长滩、彭水高谷、彭水鹿角东、酉阳西、酉阳东、大有等14个区块为页岩气有利区块。进而在对上述有利区块进行找气绝对优度和相对优度定量评价的基础上,指出黔江西、武隆、太极西、连湖东、连湖西、连湖中等6个有利区块是渝东南地区页岩气勘探开发的优先靶区。The present studies associated with shale gas mainly focus on the shale gas pooling mechanism,the geological conditions for shale gas reservoirs,and prospect area forecast,but the studies of shale gas exploration theories and methods are relatively weak,which restricts to some degree the progress of shale gas industrialization in China.In view of this,based on the abnormal geological prospecting theory and the geological characteristics of shale gas,the favorable blocks delineation and quantitative evaluation are put forward.First,71 outcrop sections and data of Yuye-1 well were collected in the Lower Silurian Longmaxi Formation,southeastern area of Chongqing.Then,according to 5 key indicators(buried depth,thickness,organic matter content,content of clay minerals and quartz) and their value ranges,7 favorable sections in this study area are predicted as follows: Dayou,Wulong,Pengshui,Lianhu,Qianjiang,Taiji,and Youyang.Furthermore,through a quantitative evaluation on the beneficial degree of the above 7 favorable sections,14 favorable shale gas blocks are delineated as Wulong,West Qianjiang,East Qianjiang,West Taiji,East Lianhu,West Lianhu,Middle Lianhu,West Lujiao(Pengshui),Changtan(Pengshui),Gaogu(Pengshui),East Lujiao(Pengshui),West Youyang,East Youyang,and Dayou.Finally,through a quantitative evaluation on the absolute advantage and relative advantage of the 14 favorable blocks,6 prior targets in this study area are pointed out: West Qianjiang,Wulong,West Taiji,East Lianhu,West Lianhu,and Middle Lianhu.

关 键 词：地质异常理论 定量评价 页岩气 有利区块 有利度 找气优度 优先靶区 渝东南地区 早志留世 

分 类 号：P618.13[天文地球—矿床学]