川东南涪陵地区下侏罗统页岩油气地质特征

doi:10.11743/ogg20130404

摘要/Abstract

摘要： 结合钻井、岩心、野外露头、测井等成果,从富含有机质页岩空间展布、地化特征、岩石矿物学、孔渗性特征和地质力学性质等方面,采用页岩气目标优选评价综合分析方法,对川东南涪陵地区下侏罗统大安寨页岩油气地质特征进行了综合研究,着重定量评价了有机碳含量、镜质体反射率、含气量、孔隙度、脆性矿物含量、岩石矿物成分、岩石力学参数等评价指标,初步证实该区页岩与美国Bakken页岩具有类似特征。涪陵大安寨泥页岩与灰岩、砂岩互层频繁,半深湖-深湖页岩为有机质富集的有利岩相。大安寨上亚段灰岩厚10~30 m,物性表现为低孔、特低渗特征;下亚段富有机质页岩夹薄层灰岩、砂岩,微孔缝发育,孔隙度高。页岩有机碳含量平均为1.33%,粘土矿物平均含量为51.7%~56.1%,石英平均含量为33%,现场实测平均含气量为1.66 m³/t,处于凝析油-湿气的高成熟阶段;杨氏模量为29 GPa,泊松比为0.30,有利于压裂形成网络裂缝。大安寨段中部浅湖相区岩性组合特征更有利于裂缝发育,是大安寨段页岩气勘探有利地区,评价优选出有利区面积820 km²。

关键词: 压裂, 富含有机质页岩, 页岩气, 大安寨段, 侏罗系, 涪陵地区, 四川盆地

Abstract: Based on integration of drilling,core,outcrop and logging data,this paper comprehensively studied the geological characteristics of the Lower Jurassic Da'anzhai shale gas play in Fuling,southeastern Sichuan Basin in such aspects as spatial distribution of organic-rich shales,geochemical characteristics,mineral components,shale porosity and permeability conditions,and geomechanical properties.We quantitatively evaluated such characteristics as TOC content,R_o,gas content,porosity,brittleness,mineral composition and rock mechanical parameters.We believe that the shale gas play is analogy basically to Bakken shale in North America.The Da'anzhai mudstone-shale features in frequent interbedding with limestone and sandstone,and the deep to semi-deep lacustrine shales are organic-rich exploration targets.The limestone in the upper Da'anzhai is 10-30 m thick and has low porosity and extra-low permeability.The lower Da'anzhai shale with interbedded thin limestone and sandstone has well-developed micro-fractures and high porosity.The shale gas play has an average TOC content of 1.33%,average clay content of 51.7%-56.1%,average quartz content of 33% and on-site measured average gas content of 1.66 cubic metre per ton,and is at high thermal maturity stage of generating gas condensate to wet gas.The Young modulus is 29GPa and Poisson ratio is 0.30,being favorable for the creation of fracture networks through hydraulic fracturing.The middle Da'anzhai shale of shallow lacustrine facies is more favorable for fracture development,thus is the favorable target.A play fairway with an area of 820 km² is identified.

Key words: hydraulic fracturing, organic-rich shale, shale gas, Da’anzhai Member, Jurassic, Fuling area, Sichuan Basin

中图分类号:

TE121.1

周德华,焦方正,郭旭升,等. 川东南涪陵地区下侏罗统页岩油气地质特征[J]. 石油与天然气地质, 2013, 34(4): 450-454. doi: 10.11743/ogg20130404 Zhou Dehua,Jiao Fangzheng,Guo Xusheng,et al. Geological features of the Lower Jurassic shale gas play in Fuling area, the southeastern Sichuan Basin[J]. Oil & Gas Geology, 2013, 34(4): 450-454. doi: 10.11743/ogg20130404

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