南盘江盆地郎岱地区下石炭统鹿寨组海相页岩气保存条件评价  

Evaluation of marine shale gas preservation conditions of lower Carboniferous Luzhai Formation in Langdai area,Nanpanjiang Basin

作　　者：盛烈豪 李坤[1] 傅劲翔 陈秋佟 郝景宇[3] 石榴 SHENG Liehao;LI Kun;FU Jinxiang;CHEN Qiutong;HAO Jingyu;SHI Liu(State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering(Chengdu University of Technology),Chengdu 610059,Sichuan,China;Research Institute of Geological Exploration and Development,Chuanqing Drilling Engineering Company,PetroChina,Chengdu 610051,Sichuan,China;Sinopec Exploration Company,Chengdu Sichuan,610041,China;Sinopec Shanghai Engineering Co.,Ltd.,Shanghai,China,200127)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),四川成都610059 [2]中国石油川庆钻探工程公司地质勘探开发研究院,四川成都610051 [3]中国石化勘探分公司,四川成都610041 [4]中石化上海工程有限公司,上海200127

出　　处：《石油地质与工程》2025年第2期16-27,共12页Petroleum Geology and Engineering

基　　金：中国石化勘探分公司科技先导项目“南盘江-桂中坳陷北缘泥盆、石炭系复杂构造沉积与页岩气目标评价”(35450003-20-ZC0607-0020)。

摘　　要：页岩气的保存是中国南方海相页岩气勘探突破的关键因素,南盘江盆地勘探潜力巨大,其中郎岱地区鹿寨组作为页岩气赋存的主要地层,以深水台盆相的泥页岩、硅质岩和含泥硅质岩为主,有机质类型为Ⅱ1型和Ⅱ2型,TOC为2.0%~3.0%,R_(o)为2.0%~2.5%。通过对页岩埋深、页岩厚度、封盖条件、构造形态、断裂发育特征、裂缝发育特征等六类影响因素分析,优选构造形态、埋深、优质页岩厚度、地层倾角、孔隙度、突破压力、断距、断裂活动期次、与主干断裂距离、裂缝发育特征等十个评价参数,采用权重系数法建立了郎岱地区鹿寨组页岩气保存条件评价标准,并划分了三类页岩气保存条件有利区。其中Ⅰ类保存区位于新寨向斜核部,其埋深和封盖条件等物质基础优越,形态好且断裂影响较弱;Ⅱ类保存区位于新寨向斜及晴隆向斜北部区域,受地层倾角和埋深影响,其页岩系统物质基础一般;郎岱向斜以及晴隆向斜的Ⅱ类保存区以外为Ⅲ类保存区,构造破坏较强,对页岩气保存不利。The preservation of shale gas is a key factor in the breakthrough of Marine shale gas exploration in southern China.Nanpanjiang Basin has great exploration potential,among which Luzhai Formation in Langdai area is the main formation for shale gas occurrence,mainly composed of deep-water platform basin facies mudstone,siliceous rock,and mud bearing siliceous rock.The organic matter types are II 1 and II 2,with TOC of 2.0%to 3.0%and R_(o) of 2.0%to 2.5%.Through field profile measurement,field fracture statistics,scanning electron microscopy,organic geochemical testing,breakthrough pressure testing,fluid inclusion identification,and other methods,this paper establishes an evaluation index for preservation conditions from six factors:shale burial depth,shale thickness,capping conditions,structural morphology,fracture development characteristics,and fracture development characteristics.It analyzes the preservation conditions of shale gas,and divides it into three types of favorable areas.Type I favorable area is located in the core of the Xinzhai syncline,with superior material foundation such as burial depth and capping conditions,good morphology,and weak impact of fractures.Type II favorable area is located in the northern region of the Xinzhai syncline and Qinglong syncline,which is affected by the dip angle and burial depth of the strata,and its material foundation of the shale system is generally average.Outside type II preservation area of the Langdai syncline and Qinglong syncline,there is a type III favorable area,which has strong structural damage and is unfavorable for shale gas preservation.

关 键 词：南盘江盆地 鹿寨组 页岩气 保存条件 

分 类 号：TE122[石油与天然气工程—油气勘探]