金溪地区的页岩气地质特征及勘探方向研究
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摘要
重庆市黔江区金溪区域地层广泛发育海相黑色碳质页岩,其五峰组-龙马溪组的黑色碳质页岩厚度在65～90 m,埋深小于3 500 m,具有较好的区域盖层,保存条件良好,是区内主要的页岩气勘探目的层。五峰组-龙马溪组页岩的有机质丰度高、成熟度高,TOC在1. 5%～2. 5%,Ro在2. 5%～3. 0%。推测总含气量在0. 05～1. 63 m~3/t,资源潜力较大。页岩气可在区内向斜核部及平缓翼部低部位等处富集。综合区域地质特征和保存条件,认为区域中部的桑柘坪向斜扬起端及东南部的濯河坝向斜核部地区是页岩气勘探有利区域,其中重点勘探方向为区内西南部187 km~2的范围。
The black carbonaceous shales of the area of Jinxi are extensively developed,and the thickness of shale in Wufeng-Longmaxi Formation is 65 ～ 90 m,with the burial depth less than 3 500 m,which is the main target layer of shale gas exploration,with a good regional cap rock and good storage conditions. Shale of this area has high abundance of organic matter and high maturity. The TOC of this layer is 1. 5% to 2. 5% and Rois 2. 5% to 3. 0%,suggesting that the total gas content is 0. 05 ～ 1. 63 m~3/t,with large resource potential. Shale gas can be enriched in the area in the oblique nucleus and the lower part of the gentle wings. Based on the regional geological characteristics and preservation conditions of the shale gas,the uplift of Sangzhiping Syncline in the central part of the region and the core area of Zhuoheba Syncline in the southeastern part of the region are favorable areas for shale gas exploration. And southwest of the area of Jinxi within the range of 187 km~2 is the key exploration direction of shale gas.
The black carbonaceous shales of the area of Jinxi are extensively developed,and the thickness of shale in Wufeng-Longmaxi Formation is 65 ～ 90 m,with the burial depth less than 3 500 m,which is the main target layer of shale gas exploration,with a good regional cap rock and good storage conditions. Shale of this area has high abundance of organic matter and high maturity. The TOC of this layer is 1. 5% to 2. 5% and Rois 2. 5% to 3. 0%,suggesting that the total gas content is 0. 05 ～ 1. 63 m~3/t,with large resource potential. Shale gas can be enriched in the area in the oblique nucleus and the lower part of the gentle wings. Based on the regional geological characteristics and preservation conditions of the shale gas,the uplift of Sangzhiping Syncline in the central part of the region and the core area of Zhuoheba Syncline in the southeastern part of the region are favorable areas for shale gas exploration. And southwest of the area of Jinxi within the range of 187 km~2 is the key exploration direction of shale gas.
引文
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[4]罗超,刘树根,孙玮,等.上扬子区下寒武统牛蹄塘组页岩气基本特征研究[J].天然气地球科学,2014,85(4):453-455.
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[7]李明诚,孙大明.地流体、封隔体和含油气系统与油气运移的关系[J].石油大学学报,2000,24(4):29-33.
[8]孙赞东,贾承造,李相方,等.非常规油气勘探与开发[M].北京:石油工业出版社,2011:872-878.
[9]张厚福,方朝亮,高先志,等.石油地质学[M].北京:石油工业出版社,1999:108-112.
[10]李新景,吕宗刚,董大忠,等.北美页岩气资源形成的地质条件[J].天然气工业,2009,29(5):27-32.
[11]陈更生,董大忠,王世谦,等.页岩气藏形成机理与富集规律初探[J].天然气工业,2009,29(5):17-21.
[12]页岩气地质与勘探开发实践丛书编委会.中国页岩气地质进展[M].北京:石油工业出版社,2011:59-63.
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