海相页岩有效产气储层特征——以四川盆地五峰组—龙马溪组页岩为例
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摘要
综合分析五峰组—龙马溪组页岩气储层特征,采用TOC值、孔隙度和含气量为含气性评价参数;脆性矿物含量为可压裂性评价参数来评价页岩气储层.以四川盆地SG区块为例,开展水平井段储层的精细评价与产量关系分析,建立该区块更为细化的储层分类标准,识别出有效产气储层.研究结果表明:五峰组—龙马溪组页岩气储层具有"四高"特征,即高TOC值(TOC≥2.0%)、高孔隙度(≥3.0%)、高含气量(≥2.0m~3/t)和高脆性矿物质量分数(≥40%),它们是页岩气储层评价的关键参数;SG区块页岩气储层类型可以细分为5类,其中Ⅰ类+Ⅱ类储层与单井产量关系最为密切,是该区块的有效产气储层;Ⅰ类+Ⅱ类储层关键参数特征为TOC≥4.0%、孔隙度≥5.0%、总含气量≥4.5m~3/t、脆性矿物质量分数≥60%,它们主要分布在龙一11小层的下段和中段;建议可进一步优化该区块水平井钻井轨迹,将水平井靶体位置放在龙一11小层中、下段,以提高有效产气储层钻遇厚度,达到提高单井产量并实现页岩气高效开发.
Characteristics of shale gas reservoir from Wufeng-Lonmaxi formations were analyzed,and some key parameters of the reservoir,such as TOCcontent,porosity,gas content and brittle mineral content,were selected for evaluation.For the SG shale gas field in Sichuan basin,the effective gas-producing reservoirs were identified by carrying out fine evaluation of shale reservoir from the horizontal wells and analyzing their production,and more detailed divisions of reservoir types were formed.The results show that there are four"high"properties of gas reservoir in Wufeng-Longmaxi shales.They are high TOCcontent(≥2.0%),high porosity(≥3.0%),high gas content(≥2.0 m~3/t)and high brittle mineral content(≥40%),respectively,which are considered as key parameters of reservoir evaluation.The shale gas reservoir in SG field can be divided into five types,and thickness of typesⅠandⅡreservoirs from horizontal wells has a positive correlation with gas production of these wells.These two types of gas reservoirs are characterized by TOCcontent≥4.0%,porosity≥5.0%,gas content≥4.5 m~3/t and brittle mineral content≥60%,which are distributed in the lower and middle parts of the L11 horizon.Some suggestions were proposed to promote the gas production of the horizontal well for more effective development of shale gas.The target of the horizontal well should be within the lower and middle parts of the L11 horizon and the horizontal well should drill thicker typesⅠandⅡreservoirs.
Characteristics of shale gas reservoir from Wufeng-Lonmaxi formations were analyzed,and some key parameters of the reservoir,such as TOCcontent,porosity,gas content and brittle mineral content,were selected for evaluation.For the SG shale gas field in Sichuan basin,the effective gas-producing reservoirs were identified by carrying out fine evaluation of shale reservoir from the horizontal wells and analyzing their production,and more detailed divisions of reservoir types were formed.The results show that there are four"high"properties of gas reservoir in Wufeng-Longmaxi shales.They are high TOCcontent(≥2.0%),high porosity(≥3.0%),high gas content(≥2.0 m~3/t)and high brittle mineral content(≥40%),respectively,which are considered as key parameters of reservoir evaluation.The shale gas reservoir in SG field can be divided into five types,and thickness of typesⅠandⅡreservoirs from horizontal wells has a positive correlation with gas production of these wells.These two types of gas reservoirs are characterized by TOCcontent≥4.0%,porosity≥5.0%,gas content≥4.5 m~3/t and brittle mineral content≥60%,which are distributed in the lower and middle parts of the L11 horizon.Some suggestions were proposed to promote the gas production of the horizontal well for more effective development of shale gas.The target of the horizontal well should be within the lower and middle parts of the L11 horizon and the horizontal well should drill thicker typesⅠandⅡreservoirs.
引文
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