Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian,southern Sichuan
Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian,southern Sichuan
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发表时间：
2012
影响因子：
1.8
通讯作者：
Huang Jinliang
中科院分区：
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作者：
Huang Jinliang
在单井储层地质分析的基础上，结合前人的研究成果、钻井和露头等资料，对川南下志留统龙马溪组下段黑色页岩储层进行了沉积环境、黑色页岩分布、矿物组成、储层孔隙类型、保渗条件、初步确定了龙马溪黑色页岩与美国主要产气页岩在4个方面的相似性：①黑色页岩为深水陆棚型;川南及邻区是一个厚度大、分布广、稳定性好的沉积相存款，其中富含有机质的泥页岩层段具有较高的自然伽马测井响应，沉积中心区厚度一般在20~ 135 m之间。③基质孔隙主要有残余原生孔隙、有机质孔隙、粘土矿物中的层间微孔和不稳定矿物中的溶蚀孔隙4种类型，孔隙类型以孔隙类型为主。泥岩基质孔隙主要由粘土矿物中的有机微孔隙和层间夹层组成。重新表示通过对以往资料的检查和实验室分析，初步确认隆玛西页岩气藏具有异常高压的特征川南龙马溪组黑色页岩具有良好的页岩气勘探开发储层条件。
Based on the analysis of single-well reservoir geology and integrated with other data of previous research results,drillings and outcrops,we characterized the black-shale reservoir in the lower Longmaxi Formation of the Lower Silurian in southern Sichuan by delineating its depositional environments,black-shale distributions,mineral compositions,reservoir pore types,conservation-permeability conditions,and mechanical properties.It is initially confirmed that the Longmaxi black shale is similar to the main producing gas shale in the United States in terms of four significant reservoir features.①Black shale is a deep-water shelf-facies deposit with great thickness and widely stable distribution in southern Sichuan and its adjacence,therein organic-rich shale intervals have a high gamma log response and are generally 20~135m thick in the depocenter area.②The total content of three brittle minerals,i.e.quartz,feldspar and carbonate,amounts to over 40% and clay minerals contain no montmorillonite and kaolinite.The formations are generally rigid,brittle and characterized by relatively high elastic modulus and low Poisson's ratio.③There exist four kinds of matrix pores,including residual primary pores,organic pores,interlayer micropores in clay minerals and dissolution pores in unstable minerals,as well as a large amount of fractures.Of which organic micropores and interlayer micropore in clay minerals are the main constituents of shale matrix pores.④Geophysics,re-examination of previous data and laboratory analyses were used to initially confirm that the Lomgmaxi shale as a gas reservoir is characteristic of an abnormal high pressure and physical properties better than anticipation.In summary,the Longmaxi Formation black shale in southern Sichuan is of good reservoir conditions for shale-gas exploration and production.