渝东北地区下古生界页岩气聚集条件及资源潜力

发布时间：2018-01-27 02:18

本文关键词： 页岩气聚集条件资源潜力古生界渝东北地区　出处：《岩性油气藏》2017年05期 　论文类型：期刊论文

【摘要】：为了系统研究渝东北地区下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气聚集条件,利用野外露头观测、实验测试分析、概率统计等多种方法,分别对2套页岩的分布、有机地球化学特征、储集条件及含气性进行了全面分析。结果表明:2套页岩均具有有机碳(TOC)含量高、成熟度高、厚度适中、有机质类型以腐泥型干酪根为主、含气量较高的特征;2套页岩均夹有薄层粉砂岩、细砂岩,富含石英、长石等碎屑组分,易于破裂形成裂缝、微裂缝,为页岩气的聚集提供了有利的物质基础及储集空间;2套页岩均对甲烷具有较强的吸附能力,现场解析平均含气质量体积分别为1.07 m~3/t和2.30 m~3/t。在此基础上,进一步确定了2套页岩有利区分布面积,采用条件概率体积法对其资源潜力分别进行了评价,得出下寒武统水井沱组和上奥陶统五峰组—下志留统龙马溪组页岩气资源量分别为0.42万亿m~3和0.38万亿m~3,均具有良好的页岩气勘探前景,城口地区的明中—厚坪一带和巫溪地区的咸水—文峰—大同一带均可作为渝东北地区页岩气勘探的有利区域。
[Abstract]:In order to systematically study the shale gas accumulation conditions of the Lower Cambrian Shuituo formation and the Upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation in northeast Chongqing, various methods such as field outcrop observation, experimental test and analysis, probability and statistics are used. The distribution, organic geochemical characteristics, reservoir conditions and gas-bearing properties of two sets of shale were analyzed. The results show that the two sets of shale have high organic carbon content, high maturity and moderate thickness. The type of organic matter is mainly sapropelic kerogen with high gas content. The two sets of shale contain thin siltstone fine sandstone rich in clastic components such as quartz feldspar and so on. They are easy to break and form fractures and microfractures which provide favorable material basis and reservoir space for shale gas accumulation. The two sets of shale have strong adsorption capacity for methane, and the average gas mass volume in situ is 1.07 mg / t and 2.30 m / t, respectively. On this basis. The distribution area of two sets of shale favorable areas was further determined, and the potential of resources was evaluated by using conditional probability volume method. It is concluded that the shale gas resources of the Lower Cambrian Shuituo formation and the Upper Ordovician Wufeng formation and Lower Silurian Longmaxi formation are 420 billion mm3 and 380 billion mm3, respectively, which have good prospects for shale gas exploration. The Ming-Zhong-Houping area in Chengkou area and the saltwater Wenfeng -Datong area in Wuxi area can be regarded as favorable areas for shale gas exploration in northeast Chongqing.
【作者单位】：中国矿业大学(北京)地球科学与测绘工程学院;中国华电集团清洁能源有限公司勘探开发事业部;重庆地质矿产研究院;
【基金】：国土资源部全国油气资源战略选区调查与评价专项“渝东北地区页岩气资源战略调查与选区”(编号:2009GYXQ15) 国家重大科技专项“来凤咸丰及鹤峰区块复杂构造区海相页岩气勘查评价应用试验”(编号:2016ZX05034004-004)联合资助
【分类号】：P618.13
【正文快照】： 0引言页岩气是指主体位于暗色页岩或高炭页岩中,以吸附或游离态为主要存在方式的天然气聚集[1],页岩本身既是烃源岩又是储集层,是典型的原地生、原地储的天然气富集模式。页岩气评价时,常规油气勘探中用于评价烃源岩、储集层、含气性、有利区及资源潜力的方法及参数均须集中体

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